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72 results on '"Eléonore Roussel"'

1. Phase Diversity Electro-optic Sampling: A new approach to single-shot terahertz waveform recording

Author: Eléonore Roussel, Christophe Szwaj, Clément Evain, Bernd Steffen, Christopher Gerth, Bahram Jalali, and Serge Bielawski
Subjects: Applied optics. Photonics, TA1501-1820, Optics. Light, QC350-467
Abstract: We demonstrate a new strategy for recording THz electric signals with long duration and high bandwidth. It uses an original combination of Terahertz electro-optic detection techniques, with diversity concepts borrowed from wireless communications and time-stretch.
Published: 2022
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2. Chirped pulse amplification in an extreme-ultraviolet free-electron laser

Author: David Gauthier, Enrico Allaria, Marcello Coreno, Ivan Cudin, Hugo Dacasa, Miltcho Boyanov Danailov, Alexander Demidovich, Simone Di Mitri, Bruno Diviacco, Eugenio Ferrari, Paola Finetti, Fabio Frassetto, David Garzella, Swen Künzel, Vincent Leroux, Benoît Mahieu, Nicola Mahne, Michael Meyer, Tommaso Mazza, Paolo Miotti, Giuseppe Penco, Lorenzo Raimondi, Primož Rebernik Ribič, Robert Richter, Eléonore Roussel, Sebastian Schulz, Luca Sturari, Cristian Svetina, Mauro Trovò, Paul Andreas Walker, Marco Zangrando, Carlo Callegari, Marta Fajardo, Luca Poletto, Philippe Zeitoun, Luca Giannessi, and Giovanni De Ninno
Subjects: Science
Abstract: Short laser pulses of femtosecond time scales are in high demand in order to explore the fast electron dynamics in light-matter interactions. Here, the authors demonstrated the compression of free electron laser pulses in the extreme ultraviolet range by using a chirped pulse amplification technique.
Published: 2016
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3. Spectrotemporal control of soft x-ray laser pulses

Author: Najmeh S. Mirian, Enrico Allaria, Niky Bruchon, Paolo Cinquegrana, Miltcho Boyanov Danailov, Giovanni De Ninno, Simone Di Mitri, Eugenio Ferrari, Luca Giannessi, Erik Hemsing, Giuseppe Penco, Eléonore Roussel, Simone Spampinati, Carlo Spezzani, Mauro Trovó, Marco Veronese, and Primož Rebernik Ribič
Subjects: Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: We exploit echo-enabled harmonic generation (EEHG) to produce fully coherent free-electron laser (FEL) pulses at soft-x-ray wavelengths and shape their spectrotemporal content. In an EEHG FEL, the longitudinal phase space of the relativistic electron beam that amplifies light is precisely tailored using two external seed lasers and two magnetic chicanes. We show that the spectrotemporal properties of the emitted radiation can be controlled by tuning the bandwidth, linear frequency chirp, and intensity of one of the seed lasers. The experimental data are supported by analytical and numerical models. Our results open a pathway toward coherent control of quantum processes at short wavelengths in the fields of applied physics, chemistry and biology, where manipulating the radiation spectrum is essential. The ability to precisely control the spectrotemporal content of intense, short-wavelength FEL pulses and the low sensitivity of the radiation to electron-beam imperfections make the technique an ideal candidate for use in chirped-pulse amplification schemes.
Published: 2020
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4. Free electron laser polarization control with interfering crossed polarized fields

Author: Eugenio Ferrari, Eléonore Roussel, Jens Buck, Carlo Callegari, Riccardo Cucini, Giovanni De Ninno, Bruno Diviacco, David Gauthier, Luca Giannessi, Leif Glaser, Gregor Hartmann, Giuseppe Penco, Frank Scholz, Joern Seltmann, Ivan Shevchuk, Jens Viefhaus, Marco Zangrando, and Enrico Massimiliano Allaria
Subjects: Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: Free electron lasers emit powerful and coherent radiation in a wide wavelength range extending to hard x-rays. This radiation is also characterized by a high degree of polarization that is generally linear and depends on the undulator properties. The possibility of controlling the polarization state of the radiation is an important option for free electron lasers that is critical for a large class of experiments. Such control can be achieved using variable polarization undulators or alternatively via the crossed polarized undulator scheme. We report the results of an extensive study for the characterization of the crossed-polarized undulator scheme in a number of different configurations. A simple model, based on Gaussian mode beam propagation, is presented and used to reproduce the experimental results obtained at the seeded free electron laser FERMI. A good agreement is found between the model and the experiment allowing us to understand the impact of the wavefront properties of the radiation coming from the consecutive undulators on the output radiation. The model is used not only for characterizing the control of the polarization but also for the control of the transverse mode.
Published: 2019
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5. Skew Quadrupole Effect of Laser Plasma Electron Beam Transport

Author: Driss Oumbarek Espinos, Amin Ghaith, Thomas André, Charles Kitégi, Mourad Sebdaoui, Alexandre Loulergue, Fabrice Marteau, Frédéric Blache, Mathieu Valléau, Marie Labat, Alain Lestrade, Eléonore Roussel, Cédric Thaury, Sébastien Corde, Guillaume Lambert, Olena Kononenko, Jean-Philippe Goddet, Amar Tafzi, Victor Malka, and Marie-Emmanuelle Couprie
Subjects: laser plasma acceleration, multipolar terms, magnetism, quadrupole, electron beam transport, free electron laser, Technology, Engineering (General). Civil engineering (General), TA1-2040, Biology (General), QH301-705.5, Physics, QC1-999, Chemistry, QD1-999
Abstract: Laser plasma acceleration (LPA) capable of providing femtosecond and GeV electron beams in cm scale distances brings a high interest for different applications, such as free electron laser and future colliders. Nevertheless, LPA high divergence and energy spread require an initial strong focus to mitigate the chromatic effects. The reliability, in particular with the pointing fluctuations, sets a real challenge for the control of the dispersion along the electron beam transport. We examine here how the magnetic defects of the first strong quadrupoles, in particular, the skew terms, can affect the brightness of the transported electron beam, in the case of the COXINEL transport line, designed for manipulating the electron beam properties for a free electron laser application. We also show that the higher the initial beam divergence, the larger the degradation. Experimentally, after having implemented a beam pointing alignment compensation method enabling us to adjust the position and dispersion independently, we demonstrate that the presence of non-negligible skew quadrupolar components induces a transversal spread and tilt of the beam, leading to an emittance growth and brightness reduction. We are able to reproduce the measurements with beam transport simulations using the measured electron beam parameters.
Published: 2019
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6. Publisher’s Note: Extreme-Ultraviolet Vortices from a Free-Electron Laser [Phys. Rev. X 7, 031036 (2017)]

Author: Primož Rebernik Ribič, Benedikt Rösner, David Gauthier, Enrico Allaria, Florian Döring, Laura Foglia, Luca Giannessi, Nicola Mahne, Michele Manfredda, Claudio Masciovecchio, Riccardo Mincigrucci, Najmeh Mirian, Emiliano Principi, Eléonore Roussel, Alberto Simoncig, Simone Spampinati, Christian David, and Giovanni De Ninno
Subjects: Physics, QC1-999
Published: 2018
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7. Extreme-Ultraviolet Vortices from a Free-Electron Laser

Author: Primož Rebernik Ribič, Benedikt Rösner, David Gauthier, Enrico Allaria, Florian Döring, Laura Foglia, Luca Giannessi, Nicola Mahne, Michele Manfredda, Claudio Masciovecchio, Riccardo Mincigrucci, Najmeh Mirian, Emiliano Principi, Eléonore Roussel, Alberto Simoncig, Simone Spampinati, Christian David, and Giovanni De Ninno
Subjects: Physics, QC1-999
Abstract: Extreme-ultraviolet vortices may be exploited to steer the magnetic properties of nanoparticles, increase the resolution in microscopy, and gain insight into local symmetry and chirality of a material; they might even be used to increase the bandwidth in long-distance space communications. However, in contrast to the generation of vortex beams in the infrared and visible spectral regions, production of intense, extreme-ultraviolet and x-ray optical vortices still remains a challenge. Here, we present an in-situ and an ex-situ technique for generating intense, femtosecond, coherent optical vortices at a free-electron laser in the extreme ultraviolet. The first method takes advantage of nonlinear harmonic generation in a helical undulator, producing vortex beams at the second harmonic without the need for additional optical elements, while the latter one relies on the use of a spiral zone plate to generate a focused, micron-size optical vortex with a peak intensity approaching 10^{14} W/cm^{2}, paving the way to nonlinear optical experiments with vortex beams at short wavelengths.
Published: 2017
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8. Polarization Characterization of Soft X-Ray Radiation at FERMI FEL-2

Author: Eléonore Roussel, Enrico Allaria, Carlo Callegari, Marcello Coreno, Riccardo Cucini, Simone Di Mitri, Bruno Diviacco, Eugenio Ferrari, Paola Finetti, David Gauthier, Giuseppe Penco, Lorenzo Raimondi, Cristian Svetina, Marco Zangrando, Andreas Beckmann, Leif Glaser, Gregor Hartmann, Frank Scholz, Joern Seltmann, Ivan Shevchuk, Jens Viefhaus, and Luca Giannessi
Subjects: free-electron laser, extreme ultraviolet, soft X-ray, polarization control, Applied optics. Photonics, TA1501-1820
Abstract: The control of polarization state in soft and hard X-ray light is of crucial interest to probe structural and symmetry properties of matter. Thanks to their Apple-II type undulators, the FERMI-Free Electron Lasers are able to provide elliptical, circular or linearly polarized light within the extreme ultraviolet and soft X-ray range. In this paper, we report the characterization of the polarization state of FERMI FEL-2 down to 5 nm. The results show a high degree of polarization of the FEL pulses, typically above 95%. The campaign of measurements was performed at the Low Density Matter beamline using an electron Time-Of-Flight based polarimeter.
Published: 2017
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9. Echo-Enabled Harmonic Generation Studies for the FERMI Free-Electron Laser

Author: Primož Rebernik Ribič, Eléonore Roussel, Gregory Penn, Giovanni De Ninno, Luca Giannessi, Giuseppe Penco, and Enrico Allaria
Subjects: free-electron laser, harmonic up-conversion, high-harmonic generation, seeding, x-ray, pump-probe, microbunching instability, Applied optics. Photonics, TA1501-1820
Abstract: Studying ultrafast processes on the nanoscale with element specificity requires a powerful femtosecond source of tunable extreme-ultraviolet (XUV) or x-ray radiation, such as a free-electron laser (FEL). Current efforts in FEL development are aimed at improving the wavelength tunability and multicolor operation, which will potentially lead to the development of new characterization techniques offering a higher chemical sensitivity and improved spatial resolution. One of the most promising approaches is the echo-enabled harmonic generation (EEHG), where two external seed lasers are used to precisely control the spectro-temporal properties of the FEL pulse. Here, we study the expected performance of EEHG at the FERMI FEL, using numerical simulations. We show that, by employing the existing FERMI layout with minor modifications, the EEHG scheme will be able to produce gigawatt peak-power pulses at wavelengths as short as 5 nm. We discuss some possible detrimental effects that may affect the performance of EEHG and compare the results to the existing double-stage FEL cascade, currently in operation at FERMI. Finally, our simulations show that, after substantial machine upgrades, EEHG has the potential to deliver coherent multicolor pulses reaching wavelengths as short as 3 nm, enabling x-ray pump–x-ray probe experiments in the water window.
Published: 2017
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10. Optical Klystron Enhancement to Self Ampliﬁed Spontaneous Emission at FERMI

Author: Giuseppe Penco, Enrico Allaria, Giovanni De Ninno, Eugenio Ferrari, Luca Giannessi, Eléonore Roussel, and Simone Spampinati
Subjects: free electron laser, SASE, optical klystron, Applied optics. Photonics, TA1501-1820
Abstract: The optical klystron enhancement to a self-ampliﬁed spontaneous emission free electron laser has been studied in theory and in simulations and has been experimentally demonstrated on a single-pass high-gain free electron laser, the FERMI FEL-1, in 2014. The main concept consists of two undulators separated by a dispersive section that converts the energy modulation induced in the ﬁrst undulator in density modulation, enhancing the coherent harmonic generation in the ﬁrst part of the second undulator. This scheme could be replicated in a multi-stage: the bunching is enhanced after each dispersive section, consistently reducing the saturation length. We have applied the multi-stage optical klystron (OK) scheme on the FEL-2 line at FERMI, whose layout includes three dispersive sections. Optimizing the strength of the dispersions allowed a signiﬁcant increase of the self-ampliﬁed spontaneous emission (SASE) intensity in comparison to a single-stage OK and extending to the soft-X rays the OK enhanced SASE previously demonstrated on FEL-1.
Published: 2017
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11. Element Selective Probe of the Ultra-Fast Magnetic Response to an Element Selective Excitation in Fe-Ni Compounds Using a Two-Color FEL Source

Author: Eugenio Ferrari, Carlo Spezzani, Franck Fortuna, Renaud Delaunay, Franck Vidal, Ivaylo Nikolov, Paolo Cinquegrana, Bruno Diviacco, David Gauthier, Giuseppe Penco, Primož Rebernik Ribič, Eléonore Roussel, Mauro Trovò, Jean-Baptiste Moussy, Tommaso Pincelli, Lounès Lounis, Cristian Svetina, Marco Zangrando, Nicola Mahne, Lorenzo Raimondi, Michele Manfredda, Emanuele Pedersoli, Flavio Capotondi, Alexander Demidovich, Luca Giannessi, Maya Kiskinova, Giovanni De Ninno, Miltcho Boyanov Danailov, Enrico Allaria, and Maurizio Sacchi
Subjects: free electron laser, two-color source, ultra-fast dynamics, Applied optics. Photonics, TA1501-1820
Abstract: The potential of the two-color mode implemented at the FERMI free-electron laser (FEL) source for pumping and probing selectively different atomic species has been demonstrated by time-resolved scattering experiments with permalloy (FeNi alloy) and NiFe2O4 samples. We monitored the ultra-fast demagnetization of Ni induced by the pump FEL pulse, by tuning the linearly-polarized FEL probe pulse to the Ni-3p resonance and measuring the scattered intensity in the transverse magneto-optical Kerr effect geometry. The measurements were performed by varying the intensity of the FEL pump pulse, tuning its wavelength to and off of the Fe-3p resonance, and by spanning the FEL probe pulse delays across the 300–900 fs range. The obtained results have evidenced that for the case of NiFe2O4, there is a sensible difference in the magnetic response at the Ni site when the pump pulse causes electronic excitations at the Fe site.
Published: 2017
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12. Single-shot recording of complex THz pulses with high bandwidth, using time-stretch and Diversity Electro-Optic Sampling

Author: Christelle Hanoun, Christophe Szwaj, Eléonore Roussel, Serge Bielawski, Pavel Evtushenko, Christof Schneider, Anton Ryzhov, Michael Kunzsch, and Sergey Kovalev
Published: 2023
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13. Seeded free-electron laser driven by a compact laser plasma accelerator

Author: Marie Labat, Jurjen Couperus Cabadağ, Amin Ghaith, Arie Irman, Anthony Berlioux, Philippe Berteaud, Frédéric Blache, Stefan Bock, François Bouvet, Fabien Briquez, Yen-Yu Chang, Sébastien Corde, Alexander Debus, Carlos De Oliveira, Jean-Pierre Duval, Yannick Dietrich, Moussa El Ajjouri, Christoph Eisenmann, Julien Gautier, René Gebhardt, Simon Grams, Uwe Helbig, Christian Herbeaux, Nicolas Hubert, Charles Kitegi, Olena Kononenko, Michael Kuntzsch, Maxwell LaBerge, Stéphane Lê, Bruno Leluan, Alexandre Loulergue, Victor Malka, Fabrice Marteau, Manh Huy N. Guyen, Driss Oumbarek-Espinos, Richard Pausch, Damien Pereira, Thomas Püschel, Jean-Paul Ricaud, Patrick Rommeluere, Eléonore Roussel, Pascal Rousseau, Susanne Schöbel, Mourad Sebdaoui, Klaus Steiniger, Keihan Tavakoli, Cédric Thaury, Patrick Ufer, Mathieu Valléau, Marc Vandenberghe, José Vétéran, Ulrich Schramm, Marie-Emmanuelle Couprie, Synchrotron SOLEIL [SSOLEIL], Helmholtz-Zentrum Dresden-Rossendorf [HZDR], Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 [PhLAM], Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Laboratoire d'optique appliquée (LOA), École Nationale Supérieure de Techniques Avancées (ENSTA Paris)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Institute of Radiation Physics [Dresden], Weizmann Institute of Science [Rehovot, Israël], DYnamique des Systèmes COmplexes (DYSCO), Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 (PhLAM), Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université de Lille-Centre National de la Recherche Scientifique (CNRS), Université de Lille-Centre National de la Recherche Scientifique (CNRS), ANR-11-LABX-0007,CEMPI,Centre Européen pour les Mathématiques, la Physique et leurs Interactions(2011), ANR-19-CE30-0031,ULTRASYNC,Exploration et contrôle ULTRArapide de la dynamique des paquets d'électrons dans les sources de lumière SYNChrotron(2019), European Project: 340015,EC:FP7:ERC,ERC-2013-ADG,COXINEL(2014), European Project: 653782,H2020,H2020-INFRADEV-1-2014-1,EuPRAXIA(2015), European Project: 339128,EC:FP7:ERC,ERC-2013-ADG,X-FIVE(2014), European Project: M-PAC, European Project: 871124, and The University of Texas at Austin
Subjects: [PHYS]Physics [physics], seeded FEL driven by LPA beams, [PHYS.PHYS.PHYS-PLASM-PH]Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph], [PHYS.PHYS.PHYS-ACC-PH]Physics [physics]/Physics [physics]/Accelerator Physics [physics.acc-ph], [SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic, free electron laser, laser plasma accelerator, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials
Abstract: Free-electron lasers generate high-brilliance coherent radiation at wavelengths spanning from the infrared to the X-ray domains. The recent development of short-wavelength seeded free-electron lasers now allows for unprecedented levels of control on longitudinal coherence[1], opening new scientific avenues as ultra-fast dynamics on complex systems and X-ray nonlinear optics. While those devices rely on state-of-the-art large-scale accelerators, advancements on laser-plasma accelerators, which harness giga-volt-per-centimeter accelerating fields, showcase a promising technology as compact drivers for free-electron lasers. Using such miniaturized accelerators, exponential amplification of a shot-noise type of radiation in a self-amplified spontaneous emission configuration was recently achieved [2]. However, employing this compact approach for the delivery of temporally coherent pulses in a controlled manner remained a major challenge. Here, we present the experimental demonstration of a laser-plasma accelerator driven free-electron laser in a seeded configuration, where control over the radiation wavelength is accomplished. Furthermore, the appearance of interference fringes, resulting from the interaction between the phase-locked emitted radiation and the seed, confirms longitudinal coherence. Building on our scientific achievements, we anticipate a straightforward scaling to extreme-ultraviolet wavelengths, paving the way towards university-scale free-electron lasers, unique tools for a multitude of applications. [1] Meyer, M. FELs of europe: Whitebook on science with free electron lasers 8–19 (2016). [2] Wang, W. et al. Free-electron lasing at 27 nanometres based on a laser wakefield accelerator.
Published: 2023
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14. Terabit sampling system with photonic time-stretch analog-to-digital converter

Author: Michele Caselle, Serge Bielawski, Olena Manzhura, Suren Chilingaryan, Timo Dritschler, Andreas Ebersoldt, Andreas Kopmann, Michael J. Nasse, Meghana Patil, Erik Bründermann, Eléonore Roussel, Christophe Szwaj, Anke-Susanne Mueller, Università degli studi di Torino = University of Turin (UNITO), Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 (PhLAM), Université de Lille-Centre National de la Recherche Scientifique (CNRS), DYnamique des Systèmes COmplexes (DYSCO), Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université de Lille-Centre National de la Recherche Scientifique (CNRS), and Karlsruhe Institute of Technology (KIT)
Subjects: [PHYS]Physics [physics], [SPI]Engineering Sciences [physics]
Abstract: International audience
Published: 2022
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15. Characterization of soft x-ray echo-enabled harmonic generation free-electron laser pulses in the presence of incoherent electron beam energy modulations

Author: Carlo Spezzani, Giuseppe Penco, S. Di Mitri, M. B. Danailov, G. De Ninno, Marco Veronese, M. Trovo, Erik Hemsing, Enrico Allaria, Paolo Cinquegrana, Simone Spampinati, Luca Giannessi, L. Badano, Eléonore Roussel, G. Perosa, Najmeh Mirian, Primoz Rebernik Ribič, Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 (PhLAM), Université de Lille-Centre National de la Recherche Scientifique (CNRS), Mirian, N. S., Perosa, G., Hemsing, E., Allaria, E., Badano, L., Cinquegrana, P., Danailov, M. B., De Ninno, G., Giannessi, L., Penco, G., Spampinati, S., Spezzani, C., Roussel, E., Ribič, P. R., Trovó, M., Veronese, M., and Di Mitri, S.
Subjects: Accelerator Physics (physics.acc-ph), Nuclear and High Energy Physics, Brightness, Physics and Astronomy (miscellaneous), [PHYS.PHYS.PHYS-ACC-PH]Physics [physics]/Physics [physics]/Accelerator Physics [physics.acc-ph], Echo Enabled Harmonic Generation, Microbunching Instability, FOS: Physical sciences, QC770-798, Photon energy, 01 natural sciences, 7. Clean energy, law.invention, Optics, law, Nuclear and particle physics. Atomic energy. Radioactivity, 0103 physical sciences, High harmonic generation, ddc:530, Harmonic number, 010306 general physics, Physics, 010308 nuclear & particles physics, business.industry, Free-electron laser, Surfaces and Interfaces, Laser, Wavelength, Cathode ray, Physics::Accelerator Physics, Physics - Accelerator Physics, business
Abstract: Physical review accelerators and beams 24(8), 080702 (2021). doi:10.1103/PhysRevAccelBeams.24.080702, Echo-enabled harmonic generation free-electron lasers (EEHG FELs)are promising candidates to produce fully coherent soft x-ray pulses by virtue of efficient high harmonic frequency up-conversion from UV lasers.The ultimate spectral limit of EEHG, however, remains unclear, because of the broadening and distortions induced in the output spectrum by residual broadband energy modulations in the electron beam. We present a mathematical description of the impact of incoherent(broadband) energy modulations on the bunching spectrum produced by the microbunching instability through both the accelerator and the EEHG line. The model is in agreementwith a systematic experimental characterization of the FERMI EEHGFEL in the photon energy range $130-210$ eV. We find that amplification of electron beam energy distortions primarily in the EEHG dispersive sections explains an observed reductionof the FEL spectral brightness that is proportional to the EEHGharmonic number. Local maxima of the FEL spectral brightness and of the spectralstability are found for a suitable balance of the dispersive sections'strength and the first seed laser pulse energy. Such characterizationprovides a benchmark for user experiments and future EEHG implementations designed to reach shorter wavelengths., Published by American Physical Society, College Park, MD
Published: 2021
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16. Stable coherent terahertz synchrotron radiation from controlled relativistic electron bunches

Author: Serge Bielawski, M. Le Parquier, J. Rodriguez, F. Ribeiro, C. Szwaj, J.-B. Brubach, Clement Evain, Marie Labat, Marie-Agnès Tordeux, Pascale Roy, Eléonore Roussel, and Nicolas Hubert
Subjects: Physics, business.industry, Terahertz radiation, General Physics and Astronomy, Synchrotron radiation, Feedback loop, 01 natural sciences, Instability, Synchrotron, 010305 fluids & plasmas, law.invention, Power (physics), Optics, Control theory, law, 0103 physical sciences, 010306 general physics, business, Storage ring
Abstract: Relativistic electron bunches used in synchrotron light sources are complex media, in which patterns might form spontaneously. These spatial structures were studied over the past decades for very practical reasons. The patterns, which spontaneously appear during an instability, increase the terahertz radiation power by factors exceeding 10,0001,2. However, their irregularity1–7 largely prevented applications of this powerful source. Here we show that principles from chaos control theory8–10 allow us to generate regular spatio-temporal patterns, stabilizing the emitted terahertz power. Regular unstable solutions are expected to coexist with the undesired irregular solutions, and may thus be controllable using feedback control. We demonstrate the stabilization of such regular solutions in the Synchrotron SOLEIL storage ring. Operation of these controlled unstable solutions enables new designs of high-charge and stable synchrotron radiation sources. A feedback loop based on chaos control theory permits the generation of stable and coherent terahertz radiation from relativistic electron bunches in synchrotron light sources.
Published: 2019
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17. EuPRAXIA conceptual design report

Author: Ke Wang, A. Y. Molodozhentsev, L. Boulton, Barbara Marchetti, Maria Weikum, Giuseppe Dattoli, Ulrich Schramm, P. Delinikolas, Victor Malka, T. L. Audet, Anna Giribono, Cristina Vaccarezza, Erik Bründermann, Marco Bellaveglia, Fernando Brandi, Vladimir Shpakov, F. Massimo, Dimitris N. Papadopoulos, D. Ullmann, Manuel Kirchen, Christophe Simon-Boisson, Axel Bernhard, Luca Piersanti, Marco Galimberti, Masaki Kando, Federico Nguyen, Suming Weng, Dario Giove, Thomas M. Spinka, Barbara Patrizi, A. Ghigo, R. Pattathil, M. A. Pocsai, Arie Irman, A. Chancé, Y. Zhao, Hao Zhang, Zulfikar Najmudin, Vladimir Litvinenko, Fabrice Marteau, G. Kirwan, U. Rotundo, Florian Grüner, L. O. Silva, F. Falcoz, Joana Luis Martins, D. Alesini, D. Khikhlukha, Francesco Iungo, Z. Mazzotta, Angelo Biagioni, A. F. Habib, Wim Leemans, S. Jaster-Merz, Alessandro Vannozzi, Leonida A. Gizzi, Fabien Briquez, S. Bartocci, Petra Koester, Tamina Akhter, Phu Anh Phi Nghiem, G. C. Bussolino, Jorge Vieira, Adolfo Esposito, D. Di Giovenale, Jens Osterhoff, Sergio Cantarella, Kristjan Poder, Bernhard Holzer, Nicolas Delerue, Brigitte Cros, Fabio Villa, Igor Andriyash, Alessandro Stecchi, Paul Crump, Sally Wiggins, Constantin Haefner, A. Del Dotto, Oscar Jakobsson, Alessandro Gallo, Emily Sistrunk, G. Di Pirro, Olena Kononenko, Yang Li, P. Campana, A. Martinez de la Ossa, Anke-Susanne Müller, Christoph Lechner, Brendan A. Reagan, Stuart Mangles, Andrew Sutherland, D. Kocon, E. N. Svystun, Simon M. Hooker, Ruggero Ricci, Javier Resta-López, C. D. Murphy, R. Walczak, Dino A. Jaroszynski, M. Yabashi, Chan Joshi, P. Santangelo, Maria Pia Anania, Konstantin Kruchinin, C. Simon, M. Hübner, C. A. Lindstrøm, Markus Büscher, Ulrich Dorda, J. Wolfenden, Alvin C. Erlandson, G. Korn, Sergey Mironov, Alessandro Rossi, Carl Schroeder, Zheng-Ming Sheng, Olle Lundh, T. Silva, Lucas Schaper, A. Ferran Pousa, M. Del Franco, Audrey Beluze, M. H. Bussmann, Alberto Marocchino, Gilles Maynard, Min Chen, Andrea Mostacci, Alexander Knetsch, Renato Fedele, M. Rossetti Conti, Amin Ghaith, G. Costa, R. Brinkmann, Gaetano Fiore, Claes-Göran Wahlström, J. Fils, Luca Serafini, Fabrizio Bisesto, J. Cowley, X. Li, Andreas Lehrach, Augusto Marcelli, Vittoria Petrillo, M. Ibison, Antonio Falone, A. Beck, Bruno Buonomo, D. Oumbarek Espinos, Daria Pugacheva, Stefan Karsch, A. Beaton, A. Nutter, Carsten Welsch, F. Mathieu, Christophe Szwaj, R. Fiorito, Paul Scherkl, C. Le Blanc, Arie Zigler, J. Scifo, Malte C. Kaluza, Craig W. Siders, Angelo Stella, Mathieu Valléau, Ujjwal Sinha, M. J. V. Streeter, A. Welsch, Efim A. Khazanov, Eléonore Roussel, Gianluca Sarri, Lucia Sabbatini, Silvia Morante, T. Heinemann, A. Aschikhin, G. Di Raddo, L. Pribyl, S. Romeo, Alberto Bacci, N. E. Andreev, Matteo Vannini, A. Bonatto, Francesco Filippi, Klaus Ertel, Riccardo Pompili, Ricardo Fonseca, Olivier Marcouillé, E. Di Pasquale, Jason Cole, M. Artioli, R. D'Arcy, Giovanni Franzini, Marco Diomede, Andreas Maier, I. Kostyukov, A. Specka, Serge Bielawski, Wei Lu, F. Cioeta, A. Mosnier, Grace Manahan, S. Vescovi, Alessandro Cianchi, P. Niknejadi, Francesco Stellato, Luigi Pellegrino, Oliver Karger, A. Helm, Bernhard Hidding, Paolo Tomassini, J. A. Clarke, A. Petralia, Davide Terzani, Enrica Chiadroni, Ralph Assmann, Alexandra Alexandrova, Paul Mason, R. Rossmanith, Jun Zhu, Thomas C. Galvin, R. Torres, Agustin Lifschitz, M. E. Couprie, Massimo Ferrario, F. Brottier, S. De Nicola, Kevin Cassou, Tomonao Hosokai, Andy J. Bayramian, J. L. Paillard, Gabriele Tauscher, P. A. Walker, Geetanjali Sharma, P. Lee, Guido Toci, Farzad Jafarinia, Simona Incremona, Imre Ferenc Barna, Charles Kitegi, D. R. Symes, M. Croia, Vladyslav Libov, J. M. Dias, Guoxing Xia, L. Labate, Assmann, R. W., Weikum, M. K., Akhter, T., Alesini, D., Alexandrova, A. S., Anania, M. P., Andreev, N. E., Andriyash, I., Artioli, M., Aschikhin, A., Audet, T., Bacci, A., Barna, I. F., Bartocci, S., Bayramian, A., Beaton, A., Beck, A., Bellaveglia, M., Beluze, A., Bernhard, A., Biagioni, A., Bielawski, S., Bisesto, F. G., Bonatto, A., Boulton, L., Brandi, F., Brinkmann, R., Briquez, F., Brottier, F., Brundermann, E., Buscher, M., Buonomo, B., Bussmann, M. H., Bussolino, G., Campana, P., Cantarella, S., Cassou, K., Chance, A., Chen, M., Chiadroni, E., Cianchi, A., Cioeta, F., Clarke, J. A., Cole, J. M., Costa, G., Couprie, M. -E., Cowley, J., Croia, M., Cros, B., Crump, P. A., D'Arcy, R., Dattoli, G., Del Dotto, A., Delerue, N., Del Franco, M., Delinikolas, P., De Nicola, S., Dias, J. M., Di Giovenale, D., Diomede, M., Di Pasquale, E., Di Pirro, G., Di Raddo, G., Dorda, U., Erlandson, A. C., Ertel, K., Esposito, A., Falcoz, F., Falone, A., Fedele, R., Ferran Pousa, A., Ferrario, M., Filippi, F., Fils, J., Fiore, G., Fiorito, R., Fonseca, R. A., Franzini, G., Galimberti, M., Gallo, A., Galvin, T. C., Ghaith, A., Ghigo, A., Giove, D., Giribono, A., Gizzi, L. A., Gruner, F. J., Habib, A. F., Haefner, C., Heinemann, T., Helm, A., Hidding, B., Holzer, B. J., Hooker, S. M., Hosokai, T., Hubner, M., Ibison, M., Incremona, S., Irman, A., Iungo, F., Jafarinia, F. J., Jakobsson, O., Jaroszynski, D. A., Jaster-Merz, S., Joshi, C., Kaluza, M., Kando, M., Karger, O. S., Karsch, S., Khazanov, E., Khikhlukha, D., Kirchen, M., Kirwan, G., Kitegi, C., Knetsch, A., Kocon, D., Koester, P., Kononenko, O. S., Korn, G., Kostyukov, I., Kruchinin, K. O., Labate, L., Le Blanc, C., Lechner, C., Lee, P., Leemans, W., Lehrach, A., Li, X., Li, Y., Libov, V., Lifschitz, A., Lindstrom, C. A., Litvinenko, V., Lu, W., Lundh, O., Maier, A. R., Malka, V., Manahan, G. G., Mangles, S. P. D., Marcelli, A., Marchetti, B., Marcouille, O., Marocchino, A., Marteau, F., Martinez de la Ossa, A., Martins, J. L., Mason, P. D., Massimo, F., Mathieu, F., Maynard, G., Mazzotta, Z., Mironov, S., Molodozhentsev, A. Y., Morante, S., Mosnier, A., Mostacci, A., Muller, A. -S., Murphy, C. D., Najmudin, Z., Nghiem, P. A. P., Nguyen, F., Niknejadi, P., Nutter, A., Osterhoff, J., Oumbarek Espinos, D., Paillard, J. -L., Papadopoulos, D. N., Patrizi, B., Pattathil, R., Pellegrino, L., Petralia, A., Petrillo, V., Piersanti, L., Pocsai, M. A., Poder, K., Pompili, R., Pribyl, L., Pugacheva, D., Reagan, B. A., Resta-Lopez, J., Ricci, R., Romeo, S., Rossetti Conti, M., Rossi, A. R., Rossmanith, R., Rotundo, U., Roussel, E., Sabbatini, L., Santangelo, P., Sarri, G., Schaper, L., Scherkl, P., Schramm, U., Schroeder, C. B., Scifo, J., Serafini, L., Sharma, G., Sheng, Z. M., Shpakov, V., Siders, C. W., Silva, L. O., Silva, T., Simon, C., Simon-Boisson, C., Sinha, U., Sistrunk, E., Specka, A., Spinka, T. M., Stecchi, A., Stella, A., Stellato, F., Streeter, M. J. V., Sutherland, A., Svystun, E. N., Symes, D., Szwaj, C., Tauscher, G. E., Terzani, D., Toci, G., Tomassini, P., Torres, R., Ullmann, D., Vaccarezza, C., Valleau, M., Vannini, M., Vannozzi, A., Vescovi, S., Vieira, J. M., Villa, F., Wahlstrom, C. -G., Walczak, R., Walker, P. A., Wang, K., Welsch, A., Welsch, C. P., Weng, S. M., Wiggins, S. M., Wolfenden, J., Xia, G., Yabashi, M., Zhang, H., Zhao, Y., Zhu, J., Zigler, A., Deutsches Elektronen-Synchrotron [Hamburg] (DESY), Istituto Nazionale di Fisica Nucleare, Sezione di Napoli (INFN, Sezione di Napoli), Istituto Nazionale di Fisica Nucleare (INFN), Laboratori Nazionali di Frascati (LNF), Laboratoire d'optique appliquée (LOA), École Nationale Supérieure de Techniques Avancées (ENSTA Paris)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de l'Accélérateur Linéaire (LAL), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Engineering & Physical Science Research Council (EPSRC), Science and Technology Facilities Council (STFC), and EuPRAXIA
Subjects: Technology, electron: energy, AMPLIFIED SPONTANEOUS-EMISSION, wake field [plasma], General Physics and Astronomy, costs, plasma: wake field, free electron laser, GeV, 01 natural sciences, 7. Clean energy, wake field [acceleration], 010305 fluids & plasmas, law.invention, Laser technology, acceleration: wake field, Conceptual design, FREE-ELECTRON LASER, AT-SPARC-LAB, law, IN-CELL CODE, [PHYS.PHYS.PHYS-PLASM-PH]Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph], PLASMA-WAKEFIELD ACCELERATION, General Materials Science, LATERAL SHEARING INTERFEROMETRY, media_common, Applied Physics, Settore FIS/01, 02 Physical Sciences, T1, light source, Physics, Settore FIS/07, accelerator: plasma, Schedule (project management), Physical Sciences, Systems engineering, positron, Plasma acceleration, X rays, compact accelerators, performance, WAKE-FIELD ACCELERATION, X-RAY SOURCE, Project implementation, Fluids & Plasmas, Physics, Multidisciplinary, accelerator [electron], Physics and Astronomy(all), HIGH PEAK POWER, electron: accelerator, horizon, medicine: imaging, X-ray, accelerators, Materials Science(all), 0103 physical sciences, media_common.cataloged_instance, ddc:530, European union, Physical and Theoretical Chemistry, 010306 general physics, energy [electron], 01 Mathematical Sciences, plasma: acceleration, acceleration [plasma], Electron energy, Science & Technology, imaging [medicine], plasma [accelerator], Particle accelerator, plasmas, Accelerators and Storage Rings, laser, Automatic Keywords, gamma ray, linear collider, ddc:600, CHIRPED-PULSE AMPLIFICATION
Abstract: European physical journal special topics 229(24), 3675 - 4284 (2020). doi:10.1140/epjst/e2020-000127-8, This report presents the conceptual design of a new European research infrastructure EuPRAXIA. The concept has been established over the last four years in a unique collaboration of 41 laboratories within a Horizon 2020 design study funded by the European Union. EuPRAXIA is the first European project that develops a dedicated particle accelerator research infrastructure based on novel plasma acceleration concepts and laser technology. It focuses on the development of electron accelerators and underlying technologies, their user communities, and the exploitation of existing accelerator infrastructures in Europe. EuPRAXIA has involved, amongst others, the international laser community and industry to build links and bridges with accelerator science — through realising synergies, identifying disruptive ideas, innovating, and fostering knowledge exchange. The Eu-PRAXIA project aims at the construction of an innovative electron accelerator using laser- and electron-beam-driven plasma wakefield acceleration that offers a significant reduction in size and possible savings in cost over current state-of-the-art radiofrequency-based accelerators. The foreseen electron energy range of one to five gigaelectronvolts (GeV) and its performance goals will enable versatile applications in various domains, e.g. as a compact free-electron laser (FEL), compact sources for medical imaging and positron generation, table-top test beams for particle detectors, as well as deeply penetrating X-ray and gamma-ray sources for material testing. EuPRAXIA is designed to be the required stepping stone to possible future plasma-based facilities, such as linear colliders at the high-energy physics (HEP) energy frontier. Consistent with a high-confidence approach, the project includes measures to retire risk by establishing scaled technology demonstrators. This report includes preliminary models for project implementation, cost and schedule that would allow operation of the full Eu-PRAXIA facility within 8—10 years., Published by Springer, Heidelberg
Published: 2020
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18. Linear optics control of sideband instability for improved free-electron laser spectral brightness

Author: Marco Veronese, Giuseppe Penco, G. Perosa, Najmeh Mirian, M. B. Danailov, S. Di Mitri, Simone Spampinati, Paolo Cinquegrana, Eléonore Roussel, Paolo Sigalotti, L. Badano, Enrico Allaria, Niky Bruchon, Luca Giannessi, P. Rebernik, M. Trovo, G. De Ninno, Alexander Demidovich, Elettra Sincrotrone Trieste, ENEA C.R. Frascati, Via E. Fermi, 45, 00044 Frascati, Roma, Italy, affiliation inconnue, DYnamique des Systèmes COmplexes (DYSCO), Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 (PhLAM), Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université de Lille-Centre National de la Recherche Scientifique (CNRS), Université de Lille-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 [PhLAM], Perosa, G., Allaria, E. M., Badano, L., Bruchon, N., Cinquegrana, P., Danailov, M. B., Demidovich, A., De Ninno, G., Giannessi, L., Mirian, N., Penco, G. M., Rebernik, P., Roussel, E., Sigalotti, P., Spampinati, S., Veronese, M., Trovo, M., and Di Mitri, S.
Subjects: Nuclear and High Energy Physics, Brightness, Physics and Astronomy (miscellaneous), [PHYS.PHYS.PHYS-ACC-PH]Physics [physics]/Physics [physics]/Accelerator Physics [physics.acc-ph], 01 natural sciences, law.invention, Optics, law, sidebands, 0103 physical sciences, High harmonic generation, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, 010306 general physics, Quadrupole magnet, FEL, [PHYS]Physics [physics], Physics, Synchrotron Radiation and Free-Electron Lasers, 010308 nuclear & particles physics, business.industry, Free-electron laser, Surfaces and Interfaces, Undulator, Laser, Modulational instability, Spectral brilliance, lcsh:QC770-798, Physics::Accelerator Physics, business, Coherence (physics)
Abstract: International audience; Extension of stable longitudinal coherence from vacuum ultraviolet to x rays is highly sought after in the free-electron laser (FEL) community, but it is often prevented by bandwidth broadening originated in the electron beam microbunching instability. We demonstrate that a proper tuning of the linear optics before the beam enters the undulator mitigates the microbunching-induced sideband instability. The experiment was conducted at the Fermi FEL operated in echo-enabled harmonic generation mode, where the spectral brightness at 7 nm wavelength was doubled. The FEL performance is compared to nonoptimized optics solutions and characterized in terms of peak intensity and spectral bandwidth shot-to-shot stability. The technique has straightforward implementation, because it uses quadrupole magnets routinely adopted for beam transport, and it applies to any FEL architecture, so paving the way to the production of high-intensity Fourier-transform limited x-ray pulses in existing and planned FEL facilities.
Published: 2020
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19. Microbunching Instability Characterisation via Temporally Modulated Laser Pulses

Author: Luca Giannessi, G. Perosa, P. Rebernik Ribič, P. Smorenburg, S. Brussaard, Enrico Allaria, I. Setija, Simone Spampinati, Carlo Spezzani, I. Akkermans, Giuseppe Penco, Najmeh Mirian, Peter Williams, Alexander Brynes, S. Di Mitri, Andrzej Wolski, Eléonore Roussel, L. Badano, Alexander Demidovich, M. Trovo, M. B. Danailov, G. De Ninno, Elettra Sincrotrone Trieste, ENEA C.R. Frascati, Via E. Fermi, 45, 00044 Frascati, Roma, Italy, affiliation inconnue, DYnamique des Systèmes COmplexes (DYSCO), Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 (PhLAM), Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université de Lille-Centre National de la Recherche Scientifique (CNRS), Université de Lille-Centre National de la Recherche Scientifique (CNRS), Brynes, A. D., Akkermans, I., Allaria, E., Badano, L., Brussaard, S., Danailov, M., Demidovich, A., De Ninno, G., Giannessi, L., Mirian, N. S., Penco, G., Perosa, G., Ribic, P. R., Roussel, E., Setija, I., Smorenburg, P., Spampinati, S., Spezzani, C., Trovo, M., Williams, P. H., Wolski, A., and Di Mitri, S.
Subjects: Accelerator Physics (physics.acc-ph), Nuclear and High Energy Physics, Physics and Astronomy (miscellaneous), [PHYS.PHYS.PHYS-ACC-PH]Physics [physics]/Physics [physics]/Accelerator Physics [physics.acc-ph], Microbunching Instability, FOS: Physical sciences, 01 natural sciences, Instability, law.invention, Optics, law, 0103 physical sciences, laser beating, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, Relativistic, 010306 general physics, Physics, [PHYS]Physics [physics], 010308 nuclear & particles physics, business.industry, Surfaces and Interfaces, Undulator, Laser, Pulse (physics), Phase space, lcsh:QC770-798, Multiple-Particle Dynamics, Physics::Accelerator Physics, Physics - Accelerator Physics, business, Beam (structure), Energy (signal processing), Fermi Gamma-ray Space Telescope
Abstract: High-brightness electron bunches, such as those generated and accelerated in free-electron lasers (FELs), can develop small-scale structure in the longitudinal phase space. This causes variations in the slice energy spread and current profile of the bunch which then undergo amplification, in an effect known as the microbunching instability. By imposing energy spread modulations on the bunch in the low-energy section of an accelerator, using an undulator and a modulated laser pulse in the centre of a dispersive chicane, it is possible tomanipulate the bunch longitudinal phase space. This allows for the control and study of the instability in unprecedented detail. We report measurements and analysis of such modulated electron bunches in the 2Dspectro-temporal domain at the FERMI FEL, for three different bunch compression schemes. We also perform corresponding simulations of these experiments and show that the codes are indeed able to reproduce the measurements across a wide spectral range. This detailed experimental verification of the ability of codes to capture the essential beam dynamics of the microbunching instability will benefit the design and performance of future FELs., 12 pages, 14 figures
Published: 2020
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20. Characterization of undulator radiation from a compact laser plasma acceleration source

Author: Amin Ghaith, Marie Labat, Alexandre Loulergue, Sebastien Corde, Olena Kononenko, Eléonore Roussel, Marie-Emmanuelle Couprie, Driss Oumbarek, Cédric Thaury, and Mathieu Valléau
Subjects: Physics, Spectrometer, business.industry, Radiation, Undulator, Laser, Plasma acceleration, Ray, Synchrotron, law.invention, Optics, Beamline, law, Physics::Accelerator Physics, business
Abstract: While synchrotron light facilities and Free Electron Lasers (FELs) are widely used for matter investigation, Laser Plasma Acceleration (LPA), delivering nowadays GeV electron beams in few centimeter accelerating distance, can be considered to drive undulator radiation and FEL. We report on the generation of undulator radiation on the COXINEL dedicated manipulation line designed for an FEL application. The LPA large divergence is handled with variable gradient permanent magnet quadrupoles and the high energy spread is reduced via a magnetic chicane. We evidence the undulator spatio-spectral signature on the first and second harmonics while measuring the radiation focused onto the entrance slit of a spectrometer equipped with a CDD camera. A good agreement is found between measurements and SRW simulations, using electron beam parameters in the undulator deduced from the measured initial electron beam parameters transported along the beamline. In addition, ray optics approach is compared to Fourier optics for the radiation propagation through optical elements.
Published: 2020
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21. Interferometry for full temporal reconstruction of laser-plasma accelerator-based seeded free electron lasers

Author: Eléonore Roussel, Serge Bielawski, M. Labat, Marie-Emmanuelle Couprie, Sebastien Corde, Alexandre Loulergue, Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 (PhLAM), Université de Lille-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'optique appliquée (LOA), École Nationale Supérieure de Techniques Avancées (ENSTA Paris)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), ANR-11-LABX-0007,CEMPI,Centre Européen pour les Mathématiques, la Physique et leurs Interactions(2011), European Project: 340015,EC:FP7:ERC,ERC-2013-ADG,COXINEL(2014), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-École Nationale Supérieure de Techniques Avancées (ENSTA Paris), and Centre National de la Recherche Scientifique (CNRS)-Université de Lille
Subjects: Free electron model, Accelerator Physics (physics.acc-ph), [PHYS.PHYS.PHYS-ACC-PH]Physics [physics]/Physics [physics]/Accelerator Physics [physics.acc-ph], General Physics and Astronomy, FOS: Physical sciences, free electron laser, Radiation, 01 natural sciences, 010305 fluids & plasmas, law.invention, Optics, law, 0103 physical sciences, 010306 general physics, Physics, [PHYS]Physics [physics], business.industry, Free-electron laser, Plasma, Computer Science::Social and Information Networks, Undulator, Plasma acceleration, Laser, Interferometry, plasma acceleration, Physics::Accelerator Physics, Physics - Accelerator Physics, business, photon diagnostic
Abstract: The spectacular development of Laser-Plasma Accelerators (LPA) appears very promising for a free electron laser application. The handling of the inherent properties of those LPA beams already allowed controlled production of LPA–based spontaneous undulator radiation. Stepping further, we here unveil that the forthcoming LPA–based seeded FELs will present distinctive spatio-spectral distributions. Relying on numerical simulations and simple analytical models, we show how those interferometric patterns can be exploited to retrieve, in single-shot, the spectro-temporal content and source point properties of the FEL pulses.
Published: 2020
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22. COXINEL transport of laser plasma accelerated electrons

Author: Alexandre Loulergue, Alain Lestrade, Sebastien Corde, Driss Oumbarek Espinos, Cédric Thaury, Mathieu Valléau, Marie Labat, Amin Ghaith, Guillaume Lambert, Charles Kitegi, Jean-Philippe Goddet, Frederic Blache, Amar Tafzi, Eléonore Roussel, Fabrice Marteau, Igor Andriyash, Olena Kononenko, Victor Malka, Thomas André, Marie-Emmanuelle Couprie, Mourad Sebdaoui, Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), Université Paris-Saclay, Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 (PhLAM), Université de Lille-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'optique appliquée (LOA), École Nationale Supérieure de Techniques Avancées (ENSTA Paris)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-École Nationale Supérieure de Techniques Avancées (ENSTA Paris), and Centre National de la Recherche Scientifique (CNRS)-Université de Lille
Subjects: Physics, business.industry, [PHYS.PHYS.PHYS-ACC-PH]Physics [physics]/Physics [physics]/Accelerator Physics [physics.acc-ph], Free-electron laser, Plasma, Electron, Undulator, Condensed Matter Physics, Laser, Plasma acceleration, 01 natural sciences, 010305 fluids & plasmas, law.invention, Optics, Nuclear Energy and Engineering, law, 0103 physical sciences, Quadrupole, Cathode ray, Physics::Accelerator Physics, 010306 general physics, business
Abstract: International audience; Laser plasma acceleration (LPA) enables the generation of an up to several GeV electron beam with a short bunch length and high peak current within a centimeter scale. In view of undulator type light source applications, electron beam manipulation has to be applied. We report here on detailed electron beam transport for an LPA electron beam on the COXINEL test line, that consists of strong permanent quadrupoles to handle the electron beam divergence, a magnetic chicane to reduce the energy spread and a second set of quadrupoles for adjusting the focusing inside the undulator. After describing the measured LPA characteristics, we show that we can properly transport the electron beam along the line, thanks to several screens. We also illustrate the influence of the chromatic effects induced by the electron beam energy spread, both experimentally and numerically. We then study the sensitivity of the transport to the electron beam pointing and skewed quadrupolar components.
Published: 2020
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23. Spectrotemporal control of soft x-ray laser pulses

Author: Primož Rebernik Ribič, Mauro Trovò, Eugenio Ferrari, Marco Veronese, Niky Bruchon, Miltcho B. Danailov, Carlo Spezzani, Simone Spampinati, Luca Giannessi, Giuseppe Penco, Enrico Allaria, Eléonore Roussel, Giovanni De Ninno, Erik Hemsing, Simone Di Mitri, Najmeh Mirian, Paolo Cinquegrana, Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 (PhLAM), Université de Lille-Centre National de la Recherche Scientifique (CNRS), Elettra Sincrotrone Trieste, Sincrotrone Trieste, DYnamique des Systèmes COmplexes (DYSCO), Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université de Lille-Centre National de la Recherche Scientifique (CNRS), and Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 [PhLAM]
Subjects: Free electron model, Nuclear and High Energy Physics, Materials science, Physics and Astronomy (miscellaneous), Astrophysics::High Energy Astrophysical Phenomena, [PHYS.PHYS.PHYS-ACC-PH]Physics [physics]/Physics [physics]/Accelerator Physics [physics.acc-ph], Physics::Optics, 01 natural sciences, 7. Clean energy, law.invention, Optics, law, 0103 physical sciences, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, Physics::Atomic Physics, 010306 general physics, ComputingMilieux_MISCELLANEOUS, [PHYS]Physics [physics], Soft x ray, Quantitative Biology::Neurons and Cognition, Synchrotron Radiation and Free-Electron Lasers, 010308 nuclear & particles physics, business.industry, Surfaces and Interfaces, Laser, lcsh:QC770-798, Physics::Accelerator Physics, business
Abstract: International audience; We exploit echo-enabled harmonic generation (EEHG) to produce fully coherent free-electron laser (FEL) pulses at soft-x-ray wavelengths and shape their spectrotemporal content. In an EEHG FEL, the longitudinal phase space of the relativistic electron beam that amplifies light is precisely tailored using two external seed lasers and two magnetic chicanes. We show that the spectrotemporal properties of the emitted radiation can be controlled by tuning the bandwidth, linear frequency chirp, and intensity of one of the seed lasers. The experimental data are supported by analytical and numerical models. Our results open a pathway toward coherent control of quantum processes at short wavelengths in the fields of applied physics, chemistry and biology, where manipulating the radiation spectrum is essential. The ability to precisely control the spectrotemporal content of intense, short-wavelength FEL pulses and the low sensitivity of the radiation to electron-beam imperfections make the technique an ideal candidate for use in chirped-pulse amplification schemes.
Published: 2020
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24. Erratum to: EuPRAXIA Conceptual Design Report – Eur. Phys. J. Special Topics 229, 3675-4284 (2020), https://doi.org/10.1140/epjst/e2020-000127-8

Author: Arie Zigler, Manuel Kirchen, Ruggero Ricci, Javier Resta-López, Eléonore Roussel, Dario Giove, A. Ghaith, Arie Irman, Vladyslav Libov, J. M. Dias, Fabio Villa, Fabrizio Bisesto, Augusto Marcelli, Bruno Buonomo, Matteo Vannini, R. Pattathil, Wim Leemans, S. Jaster-Merz, Audrey Beluze, G. C. Bussolino, Anna Giribono, Riccardo Pompili, P. Lee, Farzad Jafarinia, A. Del Dotto, Alberto Marocchino, Oscar Jakobsson, J. Scifo, R. Fiorito, Mathieu Valléau, Constantin Haefner, T. L. Audet, T. Spinka, Ujjwal Sinha, P. Santangelo, Carsten Welsch, F. Mathieu, Z. Mazzotta, Barbara Marchetti, M. A. Pocsai, Lucia Sabbatini, L. Labate, Silvia Morante, S. Romeo, Alberto Bacci, T. Heinemann, Francesco Filippi, Angelo Biagioni, A. F. Habib, D. Ullmann, Axel Bernhard, M. Artioli, Craig W. Siders, Sergio Cantarella, Alessandro Gallo, D. Kocon, C. A. Lindstrøm, Ulrich Dorda, M. Croia, Sally Wiggins, E. N. Svystun, Gabriele Tauscher, Suming Weng, Francesco Iungo, F. Massimo, Malte C. Kaluza, A. Ghigo, P. A. Walker, Fernando Brandi, Vladimir Shpakov, Anke-Susanne Müller, Ricardo Fonseca, Marie-Emmanuelle Couprie, Luca Piersanti, D. Khikhlukha, Guoxing Xia, Olle Lundh, Brendan A. Reagan, Stuart Mangles, Y. Zhao, S. Vescovi, D. Alesini, Brigitte Cros, Sergey Mironov, Andreas Lehrach, Zulfikar Najmudin, Fabrice Marteau, Oliver Karger, Kevin Cassou, Tomonao Hosokai, Markus Büscher, Vittoria Petrillo, Thomas C. Galvin, Geetanjali Sharma, C. D. Murphy, R. Walczak, Paul Crump, G. Di Pirro, Min Chen, R. Torres, A. Aschikhin, Emily Sistrunk, G. Di Raddo, Lucas Schaper, L. O. Silva, Zheng-Ming Sheng, M. Del Franco, Guido Toci, G. Kirwan, Alessandro Cianchi, Florian Grüner, M. Yabashi, Chan Joshi, Andy J. Bayramian, Marco Diomede, J. L. Paillard, Simona Incremona, Giovanni Franzini, Adolfo Esposito, D. Di Giovenale, Agustin Lifschitz, F. Falcoz, Alessandro Vannozzi, Kristjan Poder, Bernhard Holzer, Nicolas Delerue, Serge Bielawski, Olena Kononenko, Alvin C. Erlandson, G. Korn, J. Cowley, R. Brinkmann, Imre Ferenc Barna, Gaetano Fiore, Luca Serafini, Dino A. Jaroszynski, C. Simon, Enrica Chiadroni, M. Rossetti Conti, Francesco Stellato, D. Pugacheva, M. Ibison, R. Rossmanith, A. Beck, Alexandra Alexandrova, Paul Mason, Jun Zhu, Andrew Sutherland, Gianluca Sarri, Yang Li, Fabien Briquez, R. D'Arcy, Charles Kitegi, Klaus Ertel, Claes-Göran Wahlström, M. Hübner, Leonida A. Gizzi, Tamina Akhter, D. R. Symes, Stefan Karsch, A. Nutter, P. Delinikolas, J. A. Clarke, Paul Scherkl, Antonio Falone, C. Le Blanc, P. Campana, A. Martinez de la Ossa, Jason Cole, Marco Bellaveglia, G. Costa, Maria Pia Anania, Massimo Ferrario, M. J. V. Streeter, Nikolay Andreev, Konstantin Kruchinin, Ke Wang, M. H. Bussmann, Grace Manahan, Gilles Maynard, Igor Andriyash, I. Kostyukov, Dimitris N. Papadopoulos, Wei Lu, Christophe Simon-Boisson, A. Mosnier, F. Brottier, Barbara Patrizi, Alessandro Stecchi, A. Ferran Pousa, Bernhard Hidding, S. De Nicola, J. Wolfenden, Federico Nguyen, A. Y. Molodozhentsev, D. Oumbarek Espinos, Simon M. Hooker, A. Helm, Paolo Tomassini, A. Chancé, Hao Zhang, Phu Anh Phi Nghiem, A. Welsch, L. Pribyl, Christophe Szwaj, Joana Luis Martins, Maria Weikum, Efim A. Khazanov, Giuseppe Dattoli, Jens Osterhoff, A. Bonatto, S. Bartocci, Petra Koester, L. Boulton, Carl Schroeder, Angelo Stella, E. Di Pasquale, Cristina Vaccarezza, Davide Terzani, Victor Malka, P. Niknejadi, Andrea Mostacci, A. Petralia, Ralph Assmann, Christoph Lechner, U. Rotundo, Olivier Marcouillé, F. Cioeta, T. Silva, Luigi Pellegrino, J. Fils, X. Li, Jorge Vieira, Andreas Maier, A. Specka, Alessandro Rossi, Alexander Knetsch, Renato Fedele, Ulrich Schramm, Erik Bründermann, Vladimir Litvinenko, Marco Galimberti, Masaki Kando, and A. Beaton
Subjects: Technology, Applied physics, Conceptual design, Calculus, General Physics and Astronomy, General Materials Science, Physical and Theoretical Chemistry, ddc:600, GeneralLiterature_REFERENCE(e.g.,dictionaries,encyclopedias,glossaries), GeneralLiterature_MISCELLANEOUS
Abstract: Figure 20.1 was not correct in the published article. The original article has been corrected. The published apologizes for the inconvenience.
Published: 2020
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25. Tunable High Spatio-Spectral Purity Undulator Radiation from a Transported Laser Plasma Accelerated Electron Beam

Author: Christian Herbeaux, Cédric Bourgoin, J. P. Goddet, Oleg Chubar, Marie Labat, Alain Lestrade, Sebastien Corde, Fabien Briquez, Victor Malka, Yannick Dietrich, Eléonore Roussel, D. Dennetière, C. Benabderrahmane, Jean-Pierre Duval, Guillaume Lambert, Charles Kitegi, Stéphane Sebban, T. André, C. De Oliveira, Frederic Blache, C. Szwaj, Amin Ghaith, P. Berteaud, Amar Tafzi, Alexandre Loulergue, Fabrice Marteau, Igor Andriyash, Slava Smartsev, N. Leclercq, Driss Oumbarek, A. Carcy, Nicolas Hubert, Serge Bielawski, M. E. Couprie, M. El Ajjouri, Olena Kononenko, J. Vétéran, Mourad Sebdaoui, Julien Gautier, Olivier Marcouillé, Patrick Rommeluère, Cédric Thaury, Mathieu Valléau, F. Bouvet, François Polack, Keihan Tavakoli, Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), Université Paris-Saclay, Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 (PhLAM), Université de Lille-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'optique appliquée (LOA), École Nationale Supérieure de Techniques Avancées (ENSTA Paris)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-École Nationale Supérieure de Techniques Avancées (ENSTA Paris), Department of Physics of Complex Systems, Weizmann Institute of Science [Rehovot, Israël], Brookhaven National Laboratory [Upton, NY] (BNL), UT-Battelle, LLC-Stony Brook University [SUNY] (SBU), State University of New York (SUNY)-State University of New York (SUNY)-U.S. Department of Energy [Washington] (DOE), ANR-10-LABX-0039,PALM,Physics: Atoms, Light, Matter(2010), ANR-11-LABX-0007,CEMPI,Centre Européen pour les Mathématiques, la Physique et leurs Interactions(2011), European Project: 340015,EC:FP7:ERC,ERC-2013-ADG,COXINEL(2014), European Project: 339128,EC:FP7:ERC,ERC-2013-ADG,X-FIVE(2014), European Project: 653782,H2020,H2020-INFRADEV-1-2014-1,EuPRAXIA(2015), U.S. Department of Energy [Washington] (DOE)-UT-Battelle, LLC-Stony Brook University [SUNY] (SBU), State University of New York (SUNY)-State University of New York (SUNY), Synchrotron SOLEIL [SSOLEIL], and Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 [PhLAM]
Subjects: [PHYS.PHYS.PHYS-ACC-PH]Physics [physics]/Physics [physics]/Accelerator Physics [physics.acc-ph], lcsh:Medicine, Synchrotron radiation, Electron, Radiation, 7. Clean energy, 01 natural sciences, Article, Radiation properties, 010305 fluids & plasmas, law.invention, Optics, law, Free-electron lasers, 0103 physical sciences, lcsh:Science, 010306 general physics, ComputingMilieux_MISCELLANEOUS, Spectral purity, [PHYS]Physics [physics], Physics, Multidisciplinary, business.industry, lcsh:R, Laser-produced plasmas, Undulator, Laser, Synchrotron, Physics::Accelerator Physics, lcsh:Q, business
Abstract: Undulator based synchrotron light sources and Free Electron Lasers (FELs) are valuable modern probes of matter with high temporal and spatial resolution. Laser Plasma Accelerators (LPAs), delivering GeV electron beams in few centimeters, are good candidates for future compact light sources. However the barriers set by the large energy spread, divergence and shot-to-shot fluctuations require a specific transport line, to shape the electron beam phase space for achieving ultrashort undulator synchrotron radiation suitable for users and even for achieving FEL amplification. Proof-of-principle LPA based undulator emission, with strong electron focusing or transport, does not yet exhibit the full specific radiation properties. We report on the generation of undulator radiation with an LPA beam based manipulation in a dedicated transport line with versatile properties. After evidencing the specific spatio-spectral signature, we tune the resonant wavelength within 200–300 nm by modification of the electron beam energy and the undulator field. We achieve a wavelength stability of 2.6%. We demonstrate that we can control the spatio-spectral purity and spectral brightness by reducing the energy range inside the chicane. We have also observed the second harmonic emission of the undulator.
Published: 2019
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26. Control of undulator radiation using a Laser Plasma Acceleration Source

Author: Amin Ghaith, Sébastian Corde, Alexandre Loulergue, Mathieu Valléau, Marie-Emmanuelle Couprie, Victor Malka, Driss Oumbarek-Espinos, Thomas André, Marie Labat, Olivier Marcouillé, Eléonore Roussel, Serge Bielawski, Olena Kononenko, Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 (PhLAM), Université de Lille-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'optique appliquée (LOA), and École Nationale Supérieure de Techniques Avancées (ENSTA Paris)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, History, Range (particle radiation), Spectrometer, business.industry, [PHYS.PHYS.PHYS-ACC-PH]Physics [physics]/Physics [physics]/Accelerator Physics [physics.acc-ph], Undulator, Radiation, Laser, Plasma acceleration, 01 natural sciences, 010305 fluids & plasmas, Computer Science Applications, Education, law.invention, Wavelength, Optics, law, 0103 physical sciences, Physics::Accelerator Physics, Thermal emittance, 010306 general physics, business
Abstract: Spontaneous undulator radiation emission, after the COXINEL line using a Laser Plasma acceleration (LPA) source, has been observed. The line enables to manipulate the electron beam phase space such as emittance, dispersion and energy spread along a 10 m long transport. The large divergence is handled at a very early stage to mitigate the chromatic emittance, using high gradient permanent magnet based quadrupoles mounted on translation tables. The operating energy is between 161-180 MeV focused in a 2-m long cryo-ready undulator with a period of 18 mm emitting light in the Ultra-Violet range. The spectral flux is characterized using a spectrometer. The wavelength is tuned by either changing the electron beam energy or by adjusting the undulator gap. The radiation pattern signature is illustrated alongside its dependence on the energy spread that is modified by introducing a slit in a magnetic chicane where a small relative bandwidth of 5% has been achieved.
Published: 2019
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27. Progress towards laser plasma based free electron laser on COXINEL

Author: N. Leclercq, Amin Ghaith, Slava Smartsev, Serge Bielawski, Jean-Pierre Duval, Guillaume Lambert, Jean-Philippe Goddet, Christophe Szwaj, Moussa El-Ajjouri, Alexandre Loulergue, Victor Malka, Patrick Rommeluère, Christian Herbeaux, F. Bouvet, Nicolas Hubert, Amar Tafzi, Martin Khojoyan, Yannick Dietrich, Keihan Tavakoli, Olivier Marcouillé, Mourad Sebdaoui, Thomas André, Fabrice Marteau, Alain Lestrade, Sebastien Corde, Charles Kitegi, Olena Kononenko, Cédric Thaury, Mathieu Valléau, Driss Oumbarek-Espinos, Eléonore Roussel, Marie Labat, Marie-Emmanuelle Couprie, Kim Ta Phuoc, Igor Andriyash, Frederic Blache, Julien Gautier, Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), Laboratoire d'optique appliquée (LOA), École Nationale Supérieure de Techniques Avancées (ENSTA Paris)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 (PhLAM), and Université de Lille-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, History, business.industry, [PHYS.PHYS.PHYS-ACC-PH]Physics [physics]/Physics [physics]/Accelerator Physics [physics.acc-ph], Free-electron laser, Undulator, Laser, Plasma acceleration, 01 natural sciences, 010305 fluids & plasmas, Computer Science Applications, Education, law.invention, Optics, law, Ionization, 0103 physical sciences, Cathode ray, 010306 general physics, Chicane, business, Spectral purity
Abstract: The Free Electron Laser (FEL) application of Laser Plasma Acceleration (LPA) requires the handling of the energy spread and divergence. The COXINEL manipulation line, designed and built at SOLEIL for this purpose, consists of high gradient quadrupoles for divergence handling and a decompression chicane for energy sorting, enabling FEL amplification with baseline parameters. Installed at Laboratoire d’Optique Appliquee (LOA), it uses robust electrons generated and accelerated by ionization injection using a 30 TW laser. We report here on the work progress towards a FEL demonstration. The LPA measured electron beam characteristics deviates from the baseline reference case. After the installation of the equipment, the electron beam transport has first been optimized. The electron position and dispersion are independently adjusted. Then, undulator radiation has been measured. The spectral purity is controlled via the energy spread adjusted in the slit located in the chicane. FEL effect demonstration is within reach, with currently achieved performance on different LPA experiments.
Published: 2019
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28. Single-shot Measurement of THz pulses with sub-picosecond resolution and Megahertz acquisition rates

Author: Eléonore Roussel, Cejo Konuparamban Lonappan, Tianwei Jiang, Bahram Jalali, Clement Evain, Serge Bielawski, Marc Le Parquier, and Christophe Szwaj
Subjects: 010302 applied physics, Materials science, Terahertz radiation, business.industry, Resolution (electron density), Single shot, 01 natural sciences, Optics, Data acquisition, Picosecond, 0103 physical sciences, Photonics, 010306 general physics, business
Abstract: We present a method allowing THz pulses to be recorded in single-shot at tens of MHz repetition rates and long record lengths, using a combination of the time-stretch data acquisition and electro-optic sampling techniques.
Published: 2019
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29. Terahertz coherent synchrotron radiation: ultrafast characterization and control at Synchrotron SOLEIL

Author: F. Ribeiro, Eléonore Roussel, Pascal Roy, Clement Evain, C. Szwaj, Serge Bielawski, Nicolas Hubert, J.-B. Brubach, Marie Labat, J. Rodriguez, Marie-Agnès Tordeux, Laurent Manceron, and M. Le Parquier
Subjects: Physics, Optics, business.industry, law, Terahertz radiation, Thz radiation, Feedback control, Synchrotron radiation, business, Ultrashort pulse, Synchrotron, Characterization (materials science), law.invention
Abstract: We present recent results on the characterization and control of the coherent terahertz pulses emitted by synchrotron radiation facilities. We first show novel ultrafast single-shot measurements techniques now allow these sources to be fully characterized in a pulse-by-pulse basis [1]. Then we present a novel feedback method that enables the dynamics of these sources to be fully controlled [2]. This opens the way to novel sources of stable THz radiation, and to high repetition-rate spectroscopic applications.
Published: 2019
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30. Enlarging the Frontiers of Research in the IR/mm Range Using Synchrotron Radiation

Author: T. Souske, Gaël Mouret, Clement Evain, Benjamin Langerome, Francis Hindle, Marie-Aline Martin-Drumel, Francesco Capitani, Eléonore Roussel, J-B. Brubach, Marine Verseils, Sophie Eliet, Olivier Pirali, Thomas Timusk, C. Szwaj, Serge Bielawski, J.F. Lampin, Pascale Roy, Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), Institut de minéralogie, de physique des matériaux et de cosmochimie (IMPMC), Muséum national d'Histoire naturelle (MNHN)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de recherche pour le développement [IRD] : UR206-Centre National de la Recherche Scientifique (CNRS), Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Photonique THz - IEMN (PHOTONIQUE THz - IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Ligne AILES, Synchrotron SOLEIL, Institut des Sciences Moléculaires d'Orsay (ISMO), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physico-Chimie de l'Atmosphère (LPCA), Université du Littoral Côte d'Opale (ULCO), Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 (PhLAM), Université de Lille-Centre National de la Recherche Scientifique (CNRS), NONE FOUND, Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de recherche pour le développement [IRD] : UR206-Muséum national d'Histoire naturelle (MNHN)-Centre National de la Recherche Scientifique (CNRS), Photonique THz - IEMN (PHOTONIQ THz - IEMN), and Université du Littoral Côte d'Opale (ULCO)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Brightness, Range (particle radiation), Materials science, Temperature measurement, Infrared, Terahertz radiation, business.industry, Optical films, [PHYS.PHYS.PHYS-ACC-PH]Physics [physics]/Physics [physics]/Accelerator Physics [physics.acc-ph], Synchrotron radiation, Reflectivity, Optical filters, Interferometry, Optics, Optical interferometry, Optical reflection, Frequency measurement, [PHYS.PHYS.PHYS-CHEM-PH]Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph], business, Optical filter, ComputingMilieux_MISCELLANEOUS
Abstract: International audience; Abstract:Optical probes are among the most important techniques for characterizing new physical states induced by changes of temperature and/or pressure. In link with its high brightness and wide spectral coverage, infrared synchrotron radiation is ideally suited for such studies when the quantity of material to investigate is limited or when the system needs to be probed down to the sub mm domain.
Published: 2019

31. Towards a free electron laser using laser plasma acceleration on COXINEL

Author: S. Corde, J. P. Goddet, Frederic Blache, F. Bouvet, Christian Herbeaux, M. E. Couprie, Fabien Briquez, C. Benabderrahmane, Fabrice Marteau, Victor Malka, M. El Ajjouri, Serge Bielawski, C. Evain, Eléonore Roussel, Alain Lestrade, Driss Oumbarek, C. Szwaj, Slava Smartsev, C. Thaury, Nicolas Hubert, François Polack, Amin Ghaith, Patrick Rommeluère, K. Ta Phuoc, Jean-Pierre Duval, Benoît Mahieu, Guillaume Lambert, Keihan Tavakoli, A. Tafzi, Martin Khojoyan, Alexandre Loulergue, C. de Oliviera, Igor Andriyash, Yannick Dietrich, Thomas André, Charles Kitegi, Olivier Marcouillé, N. Leclercq, D. Dennetière, Marie Labat, Mourad Sebdaoui, J. Gautier, and Mathieu Valléau
Subjects: Physics, business.industry, Free-electron laser, Undulator, Plasma acceleration, Laser, law.invention, Optics, law, Thermal emittance, Spontaneous emission, business, Beam (structure), Beam divergence
Abstract: Since the laser invention [1, 2], the advent of Free Electron Lasers (FEL) [3, 4] in the X-ray domain half a century later, has opened new areas for matter investigation with higher temporal resolution. In parallel, the development of laser plasma acceleration (LPA) [5] that delivers today several GeV beam acceleration [6] in a short distance appears also very promising. The qualification of the LPA for FEL application can thus be viewed as an important challenge [7]. Nevertheless, present LPA electron beam parameters (e. g. energy spread and beam divergence) do not meet conventional accelerator state-of-the-art performance and FEL application requires a specific beam handling. In such a prospect, the COXINEL beam manipulation line [8, 9] using variable permanent magnet quadrupoles for emittance growth mitigation and de-mixing chicane for the energy spread handling developed at SOLEIL has been installed for using electrons produced with an intense laser of Laboratoire d’Optique Appliquee (LOA). Strategies for controlling electron beam position and dispersion have been elaborated and demonstrated [10]. Finally, undulator spontaneous emission has been measured at the end of the line.
Published: 2019
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32. Free electron laser polarization control with interfering crossed polarized fields

Author: Leif Glaser, Eugenio Ferrari, David Gauthier, Riccardo Cucini, Enrico Allaria, Gregor Hartmann, Giuseppe Penco, Ivan Shevchuk, Joern Seltmann, Jens Viefhaus, Jens Buck, Eléonore Roussel, Giovanni De Ninno, Luca Giannessi, Marco Zangrando, Bruno Diviacco, Frank Scholz, Carlo Callegari, Ferrari, E., Roussel, E., Buck, J., Callegari, C., Cucini, R., De Ninno, G., Diviacco, B., Gauthier, D., Giannessi, L., Glaser, L., Hartmann, G., Penco, G., Scholz, F., Seltmann, J., Shevchuk, I., Viefhaus, J., Zangrando, M., Allaria, E. M., Elettra Sincrotrone Trieste, Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), ELETTRA, Sincrotrone Trieste, Synchrotron ELETTRA Trieste, Infectious Diseases, Ospedali Galliera, Institute for Forest Genetics and Forest Tree Breeding, Federal Research Centre for Forestry and Forest Products, German Weather Service, and Deutsches Elektronen-Synchrotron [Hamburg] (DESY)
Subjects: Free electron model, Nuclear and High Energy Physics, fel, Physics and Astronomy (miscellaneous), polarization control, 01 natural sciences, law.invention, Optics, law, crossed polarized fields, 0103 physical sciences, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, no topic specified, ddc:530, 010306 general physics, ComputingMilieux_MISCELLANEOUS, undulators, Physics, Wavefront, [PHYS]Physics [physics], polarization, 010308 nuclear & particles physics, business.industry, Free-electron laser, Surfaces and Interfaces, Undulator, Polarization (waves), Laser, Transverse mode, Degree of polarization, lcsh:QC770-798, business
Abstract: Physical review accelerators and beams 22(8), 080701 (2019). doi:10.1103/PhysRevAccelBeams.22.080701, Free electron lasers emit powerful and coherent radiation in a wide wavelength range extending to hardx-rays. This radiation is also characterized by a high degree of polarization that is generally linear anddepends on the undulator properties. The possibility of controlling the polarization state of the radiation isan important option for free electron lasers that is critical for a large class of experiments. Such control canbe achieved using variable polarization undulators or alternatively via the crossed polarized undulatorscheme. We report the results of an extensive study for the characterization of the crossed-polarizedundulator scheme in a number of different configurations. A simple model, based on Gaussian mode beampropagation, is presented and used to reproduce the experimental results obtained at the seeded freeelectron laser FERMI. A good agreement is found between the model and the experiment allowing us tounderstand the impact of the wavefront properties of the radiation coming from the consecutive undulatorson the output radiation. The model is used not only for characterizing the control of the polarization but alsofor the control of the transverse mode., Published by American Physical Society, College Park, MD
Published: 2019
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33. EuPRAXIA - A Compact, Cost-Efficient Particle and Radiation Source

Author: C. D. Murphy, Markus Büscher, Gabriele Tauscher, Malte C. Kaluza, Dino A. Jaroszynski, O. Delferrière, P. A. Walker, C. Simon, M. Hübner, Petra Koester, Bernhard Hidding, Paolo Tomassini, Arnaud Beck, F. Filippi, J. A. Clarke, Arie Irman, Daria Pugacheva, Alessandro Cianchi, Marco Galimberti, P. Gastinel, S. De Nicola, G. C. Bussolino, Paul Scherkl, M. J. V. Streeter, Enrica Chiadroni, Feiyu Li, Joana Luis Martins, Efim A. Khazanov, Masaki Kando, Barbara Marchetti, S. Romeo, Alberto Bacci, R. Rossmanith, Jason Cole, O. Kononenko, J. Scifo, Grace Manahan, P. D. Alesini, Maria Weikum, A. Ferran Pousa, Tomonao Hosokai, Gilles Maynard, A. F. Habib, J. C. Chanteloup, Jorge Vieira, Stuart Mangles, Cristina Vaccarezza, Alexandra Alexandrova, Anna Giribono, Paul Mason, Jun Zhu, N.R. Thompson, A. Lifschitz, Ujjwal Sinha, Lucas Schaper, La Gizzi, Stefan Karsch, Axel Bernhard, L. Pribyl, Ulrich Schramm, Florian Grüner, Christoph Lechner, Federico Nguyen, Andreas Maier, Timon Mehrling, F. Massimo, A. Beluze, Andreas Lehrach, A. Aschikhin, M. Yabashi, David Garzella, Erik Bründermann, T. Silva, Simon M. Hooker, Brigitte Cros, A. Chancé, Vittoria Petrillo, Aakash A. Sahai, Gaetano Fiore, Fabrizio Bisesto, Alexander Knetsch, Renato Fedele, X. Li, A. Martinez de la Ossa, Maria Pia Anania, Konstantin Kruchinin, Kristjan Poder, I. Kostyukov, Wei Lu, G. Korn, Vladimir Litvinenko, Phu Anh Phi Nghiem, Bernhard Holzer, P. Niknejadi, Nicolas Delerue, Massimo Ferrario, Gianluca Sarri, Igor Andriyash, A. Marocchino, Z. Mazzotta, N. E. Andreev, Wim Leemans, S. Jaster-Merz, Carl Schroeder, Andrea Mostacci, C. Joshi, Fabio Villa, Ralph Assmann, R. Torres, Serge Bielawski, P. P. Rajeev, Farzad Jafarinia, Dario Giove, Michael Bussmann, J. Fils, Ulrich Dorda, M. Croia, J. Schwindling, O. Bringer, Guoxing Xia, T. Akhter, D. Terzani, J. Wolfenden, D. Kocon, Carsten Welsch, M. E. Couprie, F. Mathieu, E. N. Svystun, R. Brinkmann, Claes-Göran Wahlström, Ricardo Fonseca, Oliver Karger, C. Szwaj, T. L. Audet, D. Ullmann, Anke-Susanne Müller, Min Chen, A. Gallo, A. Specka, Barbara Patrizi, Jens Osterhoff, P. Delinikolas, Luca Serafini, T. Heinemann, A. Beaton, Arie Zigler, A. Y. Molodozhentsev, Eléonore Roussel, Matteo Vannini, Riccardo Pompili, Giuseppe Dattoli, Victor Malka, M. A. Pocsai, M. Rossetti Conti, D. Khikhlukha, Fernando Brandi, Lujie Yu, Zulfikar Najmudin, Luis O. Silva, Paul Crump, Zheng-Ming Sheng, Guido Toci, Imre Ferenc Barna, D. R. Symes, Vladyslav Libov, L. Labate, Roman Walczak, Andrea Rossi, D. Papadopoulos, João Dias, K. Wang, Olle Lundh, Floyd McDaniel, Gary Glass, Barney Doyle, Arlyn Antolak and Yongqiang Wang, Weikum, M. K., Akhter, T., Alesini, P. D., Alexandrova, A. S., Anania, M. P., Andreev, N. E., Andriyash, I., Aschikhin, A., Assmann, R. W., Audet, T., Bacci, A., Barna, I. F., Beaton, A., Beck, A., Beluze, A., Bernhard, A., Bielawski, S., Bisesto, F. G., Brandi, F., Bringer, O., Brinkmann, R., Bründermann, E., Büscher, M., Bussmann, M., Bussolino, G. C., Chance, A., Chanteloup, J. C., Chen, M., Chiadroni, E., Cianchi, A., Clarke, J., Cole, J., Couprie, M. E., Croia, M., Cros, B., Crump, P., Dattoli, G., Delerue, N., Delferriere, O., Delinikolas, P., De Nicola, S., Dias, J., Dorda, U., Fedele, R., Pousa, A. Ferran, Ferrario, M., Filippi, F., Fils, J., Fiore, G., Fonseca, R. A., Galimberti, M., Gallo, A., Garzella, D., Gastinel, P., Giove, D., Giribono, A., Gizzi, L. A., Grüner, F. J., Habib, A. F., Heinemann, T., Hidding, B., Holzer, B. J., Hooker, S. M., Hosokai, T., Hübner, M., Irman, A., Jafarinia, F., Jaroszynski, D. A., Jaster-Merz, S., Joshi, C., Kaluza, M. C., Kando, M., Karger, O. S., Karsch, S., Khazanov, E., Khikhlukha, D., Knetsch, A., Kocon, D., Koester, P., Kononenko, O., Korn, G., Kostyukov, I., Kruchinin, K., Labate, L., Lechner, C., Leemans, W. P., Lehrach, A., Li, F. Y., Li, X., Libov, V., Lifschitz, A., Litvinenko, V., Lu, W., Lundh, O., Maier, A. R., Malka, V., Manahan, G. G., Mangles, S. P. D., Marchetti, B., Marocchino, A., de la Ossa, A. Martinez, Martins, J. L., Mason, P., Massimo, F., Mathieu, F., Maynard, G., Mazzotta, Z., Mehrling, T. J., Molodozhentsev, A. Y., Mostacci, A., Müller, A. S., Murphy, C. D., Najmudin, Z., Nghiem, P. A. P., Nguyen, F., Niknejadi, P., Osterhoff, J., Papadopoulos, D., Patrizi, B., Petrillo, V., Pocsai, M. A., Poder, K., Pompili, R., Pribyl, L., Pugacheva, D., Romeo, S., Rajeev, P. P., Conti, M. Rossetti, Rossi, A. R., Rossmanith, R., Roussel, E., Sahai, A. A., Sarri, G., Schaper, L., Scherkl, P., Schramm, U., Schroeder, C. B., Schwindling, J., Scifo, J., Serafini, L., Sheng, Z. M., Silva, L. O., Silva, T., Simon, C., Sinha, U., Specka, A., Streeter, M. J. V., Svystun, E. N., Symes, D., Szwaj, C., Tauscher, G., Terzani, D., Thompson, N., Toci, G., Tomassini, P., Torres, R., Ullmann, D., Vaccarezza, C., Vannini, M., Vieira, J. M., Villa, F., Wahlström, C. -G., Walczak, R., Walker, P. A., Wang, K., Welsch, C. P., Wolfenden, J., Xia, G., Yabashi, M., Yu, L., Zhu, J., Zigler, A., Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), Laboratoire de physique des gaz et des plasmas (LPGP), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Leprince-Ringuet (LLR), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Laboratoire pour l'utilisation des lasers intenses (LULI), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-École polytechnique (X)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 (PhLAM), Université de Lille-Centre National de la Recherche Scientifique (CNRS), Département des Accélérateurs, de Cryogénie et de Magnétisme (ex SACM) (DACM), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire de l'Accélérateur Linéaire (LAL), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Brundermann, E., Buscher, M., Pousa, A. F., Gruner, F. J., Hubner, M., De La Ossa, A. M., Muller, A. S., Conti, M. R., and Wahlstrom, C. -G.
Subjects: Cost efficiency, [PHYS.PHYS.PHYS-ACC-PH]Physics [physics]/Physics [physics]/Accelerator Physics [physics.acc-ph], Radiation, Plasma acceleration, 7. Clean energy, 01 natural sciences, Plasmas, accelerators, 010305 fluids & plasmas, Particle acceleration, Conceptual design, 13. Climate action, 0103 physical sciences, Systems engineering, Particle, ddc:530, Laser beam quality, 010306 general physics, Plasmas (physics) | Lasers | Laser wakefield, Electrical efficiency, QC
Abstract: 25th International Conference on the Application of Accelerators in Research and Industry, CAARI 2018, Texas, USA, 12 Aug 2018 - 17 Aug 2018; AIP conference proceedings 2160(1), 040012-1 - 040012-9 (2019). doi:https://doi.org/10.1063/1.5127692, Plasma accelerators present one of the most suitable candidates for the development of more compact particle acceleration technologies, yet they still lag behind radiofrequency (RF)-based devices when it comes to beam quality, control, stability and power efficiency. The Horizon 2020-funded project EuPRAXIA (“European Plasma Research Accelerator with eXcellence In Applications”) aims to overcome the first three of these hurdles by developing a conceptual design for a first international user facility based on plasma acceleration. In this paper we report on the main features, simulation studies and potential applications of this future research infrastructure., Published by AIP Publishing, Melville, NY
Published: 2019
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34. Coherent Soft X-Ray pulses from an Echo-Enabled Harmonic Generation Free-Electron Laser

Author: Eugenio Ferrari, Marco Veronese, Ivan Cudin, C. Scafuri, Emiliano Principi, Roberto Sauro, Lorenzo Raimondi, Davide Vivoda, Mauro Trovò, Paolo Sigalotti, M. Zaccaria, M. Svandrlik, Mihai Pop, D. Zangrando, Paolo Cinquegrana, Flavio Capotondi, Giulio Gaio, Carlo Spezzani, Bruno Diviacco, Giuseppe Penco, G. Kurdi, Simone Spampinati, Amin Ghaith, W. M. Fawley, Claudio Masciovecchio, Marcello Coreno, Marco Cautero, L. Badano, David Garzella, Fatma Iazzourene, Nicola Mahne, Eléonore Roussel, Vanessa Grattoni, Giovanni De Ninno, L. Sturari, F. Giacuzzo, Laura Foglia, Niky Bruchon, Dao Xiang, Ivaylo Nikolov, T. Tanikawa, Marie Emmanuelle Couprie, Primož Rebernik Ribič, S. Grulja, Miltcho B. Danailov, Chao Feng, Luca Giannessi, D. Castronovo, Mario Ferianis, Enrico Allaria, Marco Zangrando, Alexander Demidovich, A. Abrami, M. Bossi, Najmeh Mirian, Paolo Miotti, Gregory Penn, Fabio Frassetto, Eduard Prat, Michele Manfredda, Marco Malvestuto, Luca Poletto, Marco Lonza, Erik Hemsing, Hans-Heinrich Braun, Simone Di Mitri, Sven Reiche, Rebernik Ribic, P., Abrami, A., Badano, L., Bossi, M., Braun, H. -H., Bruchon, N., Capotondi, F., Castronovo, D., Cautero, M., Cinquegrana, P., Coreno, M., Couprie, M. E., Cudin, I., Boyanov Danailov, M., De Ninno, G., Demidovich, A., Di Mitri, S., Diviacco, B., Fawley, W. M., Feng, C., Ferianis, M., Ferrari, E., Foglia, L., Frassetto, F., Gaio, G., Garzella, D., Ghaith, A., Giacuzzo, F., Giannessi, L., Grattoni, V., Grulja, S., Hemsing, E., Iazzourene, F., Kurdi, G., Lonza, M., Mahne, N., Malvestuto, M., Manfredda, M., Masciovecchio, C., Miotti, P., Mirian, N. S., Petrov Nikolov, I., Penco, G. M., Penn, G., Poletto, L., Pop, M., Prat, E., Principi, E., Raimondi, L., Reiche, S., Roussel, E., Sauro, R., Scafuri, C., Sigalotti, P., Spampinati, S., Spezzani, C., Sturari, L., Svandrlik, M., Tanikawa, T., Trovo, M., Veronese, M., Vivoda, D., Xiang, D., Zaccaria, M., Zangrando, D., Zangrando, M., Allaria, E. M., Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), Laboratoire Interactions, Dynamiques et Lasers (ex SPAM) (LIDyl), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 (PhLAM), Université de Lille-Centre National de la Recherche Scientifique (CNRS), and Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)
Subjects: echo-enabled harmonic generation, [PHYS.PHYS.PHYS-ACC-PH]Physics [physics]/Physics [physics]/Accelerator Physics [physics.acc-ph], Physics::Optics, free-electron laser, X-ray, 02 engineering and technology, 01 natural sciences, Mathematical Sciences, law.invention, 010309 optics, Optics, law, 0103 physical sciences, Relativistic electron beam, High harmonic generation, ddc:530, free-electron-laser, Physics, business.industry, Free-electron laser, 021001 nanoscience & nanotechnology, Laser, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, Optoelectronics & Photonics, Atomic electron transition, Physical Sciences, Harmonic, Cathode ray, Physics::Accelerator Physics, 0210 nano-technology, business, Lasing threshold
Abstract: X-ray free-electron lasers (FELs), which amplify light emitted by a relativistic electron beam, are extending nonlinear optical techniques to shorter wavelengths, adding element specificity by exciting and probing electronic transitions from core levels. These techniques would benefit tremendously from having a stable FEL source, generating spectrally pure and wavelength-tunable pulses. We show that such requirements can be met by operating the FEL in the so-called echo-enabled harmonic generation (EEHG) configuration. Here, two external conventional lasers are used to precisely tailor the longitudinal phase space of the electron beam before emission of X-rays. We demonstrate high-gain EEHG lasing producing stable, intense, nearly fully coherent pulses at wavelengths as short as 5.9 nm (~211 eV) at the FERMI FEL user facility. Low sensitivity to electron-beam imperfections and observation of stable, narrow-band, coherent emission down to 2.6 nm (~474 eV) make the technique a prime candidate for generating laser-like pulses in the X-ray spectral region, opening the door to multidimensional coherent spectroscopies at short wavelengths. Echo-enabled harmonic generation in a free-electron laser enables 45th harmonic pulses from a 264 nm wavelength seed, yielding 5.9 nm wavelength coherent output.
Published: 2019
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35. Energy spread tuning of a laser-plasma accelerated electron beam in a magnetic chicane

Author: D. Oumbarek Espinos, Olivier Marcouillé, Fabrice Marteau, Victor Malka, Guillaume Lambert, Charles Kitegi, Alexandre Loulergue, T. André, M-E Couprie, Mourad Sebdaoui, Eléonore Roussel, Marie Labat, O Kononenko, A. Tafzi, Frederic Blache, Igor Andriyash, J. P. Goddet, Alain Lestrade, Sebastien Corde, Amin Ghaith, F. Bouvet, Keihan Tavakoli, Cédric Thaury, Mathieu Valléau, Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 (PhLAM), Université de Lille-Centre National de la Recherche Scientifique (CNRS), Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), Université Paris-Saclay, Department of Physics of Complex Systems, Weizmann Institute of Science [Rehovot, Israël], Laboratoire d'optique appliquée (LOA), École Nationale Supérieure de Techniques Avancées (ENSTA Paris)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Department of Material and Life Science, Graduate School of Engineering, Osaka University, and Osaka University [Osaka]
Subjects: [PHYS]Physics [physics], Physics, 010308 nuclear & particles physics, business.industry, [PHYS.PHYS.PHYS-ACC-PH]Physics [physics]/Physics [physics]/Accelerator Physics [physics.acc-ph], Transfer line, Plasma, Electron, Radiation, Undulator, Condensed Matter Physics, Laser, 01 natural sciences, law.invention, Optics, Nuclear Energy and Engineering, law, 0103 physical sciences, Cathode ray, Physics::Accelerator Physics, 010306 general physics, business, Beam (structure)
Abstract: International audience; Laser-plasma accelerators (LPA) deliver relativistic electron beams with high peak current and low emittance, with energies up to the GeV-level in only few centimetres. However, the divergence and the energy spread of these beams remain too large for potential light source applications. A magnetic transfer line can be used to manipulate the electron beam phase-space and select the transmitted energies with a slit located at its center. We will show that with a proper focusing optics along the line, one can tune the energy spread of the beam at a given energy without loss and produce undulator radiation with controlled bandwidth. We present analytic studies, numerical simulations and experimental results on the controled electron beam transport and application to undulator radiation with a control of the bandwidth.
Published: 2020
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36. Coherent THz Emission Enhanced by Coherent Synchrotron Radiation Wakefield

Author: Giuseppe Penco, Enrico Allaria, Ivan Cudin, Giulio Gaio, Carlo Spezzani, M. Trovo, S. Di Mitri, Andrea Perucchi, Bruno Diviacco, D. Gauthier, G. De Ninno, Luca Giannessi, Eléonore Roussel, P. Di Pietro, Stefano Lupi, Federica Piccirilli, P. Rebernik, L. Badano, Marco Veronese, Nidhi Adhlakha, Simone Spampinati, S. Nicastro, and Giannessi, L.
Subjects: Terahertz radiation, Extreme ultraviolet lithography, lcsh:Medicine, Synchrotron radiation, 02 engineering and technology, 01 natural sciences, Article, law.invention, Optics, law, 0103 physical sciences, Beam dump, lcsh:Science, 010306 general physics, Physics, Multidisciplinary, business.industry, lcsh:R, Free-electron laser, 021001 nanoscience & nanotechnology, Transition radiation, Electron optics, Cathode ray, Physics::Accelerator Physics, lcsh:Q, 0210 nano-technology, business
Abstract: We demonstrate that emission of coherent transition radiation by a ∼1 GeV energy-electron beam passing through an Al foil is enhanced in intensity and extended in frequency spectral range, by the energy correlation established along the beam by coherent synchrotron radiation wakefield, in the presence of a proper electron optics in the beam delivery system. Analytical and numerical models, based on experimental electron beam parameters collected at the FERMI free electron laser (FEL), predict transition radiation with two intensity peaks at ∼0.3 THz and ∼1.5 THz, and extending up to 8.5 THz with intensity above 20 dB w.r.t. the main peak. Up to 80-µJ pulse energy integrated over the full bandwidth is expected at the source, and in agreement with experimental pulse energy measurements. By virtue of its implementation in an FEL beam dump line, this work promises dissemination of user-oriented multi-THz beamlines parasitic and self-synchronized to EUV and x-ray FELs.
Published: 2018
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37. Publisher’s Note: Extreme-Ultraviolet Vortices from a Free-Electron Laser [Phys. Rev. X 7, 031036 (2017)]

Author: Christian David, Nicola Mahne, Giovanni De Ninno, David Gauthier, Florian Döring, Claudio Masciovecchio, Primož Rebernik Ribič, Enrico Allaria, Riccardo Mincigrucci, N. S. Mirian, Simone Spampinati, Michele Manfredda, Alberto Simoncig, Eléonore Roussel, Benedikt Rösner, Emiliano Principi, Laura Foglia, and Luca Giannessi
Subjects: Physics, Extreme ultraviolet, QC1-999, Free-electron laser, General Physics and Astronomy, Atomic physics, Vortex
Published: 2018

38. Symmetry breakdown of electron emission in extreme ultraviolet photoionization of argon

Author: M. B. Danailov, Riccardo Cucini, A. Achner, Anders Lindahl, Oksana Plekan, Peter Walter, Eugenio Ferrari, Paola Finetti, Markus Ilchen, Marco Zangrando, Jörn Seltmann, Ryan Coffee, Eléonore Roussel, Enrico Allaria, Jens Viefhaus, C. Svetina, André Knie, A. De Fanis, Tommaso Mazza, Alexander Demidovich, Ivan Shevchuk, Lorenzo Raimondi, Carlo Callegari, Alexei N. Grum-Grzhimailo, Gregor Hartmann, Nicola Mahne, Jens Buck, Markus Braune, Leif Glaser, Elena V. Gryzlova, Andreas Beckmann, Michael Meyer, and Frank Scholz
Subjects: Photon, Physics::Instrumentation and Detectors, Science, interference, General Physics and Astronomy, chemistry.chemical_element, Ionic bonding, Physics::Optics, Photoionization, Electron, 01 natural sciences, 1st, General Biochemistry, Genetics and Molecular Biology, Article, 010305 fluids & plasmas, law.invention, double-ionization, law, 0103 physical sciences, Free electron lasers | ionization | free-electron lasers, Physics::Atomic and Molecular Clusters, molecules, Symmetry breaking, Physics::Atomic Physics, 010306 general physics, Spectroscopy, lcsh:Science, Physics, Multidisciplinary, Argon, atoms, General Chemistry, Laser, x-ray photoemission, spectroscopy experiments, chemistry, photoelectron angular-distributions, ions, lcsh:Q, subshells, ddc:500, Atomic physics
Abstract: Nature Communications 9(1), 4659 (2018). doi:10.1038/s41467-018-07152-7, Short wavelength free-electron lasers (FELs), providing pulses of ultrahigh photon intensity, have revolutionized spectroscopy on ionic targets. Their exceptional photon flux enables multiple photon absorptions within a single femtosecond pulse, which in turn allows for deep insights into the photoionization process itself as well as into evolving ionic states of a target. Here we employ ultraintense pulses from the FEL FERMI to spectroscopically investigate the sequential emission of electrons from gaseous, atomic argon in the neutral as well as the ionic ground state. A pronounced forward-backward symmetry breaking of the angularly resolved emission patterns with respect to the light propagation direction is experimentally observed and theoretically explained for the region of the Cooper minimum, where the asymmetry of electron emission is strongly enhanced. These findings aim to originate a better understanding of the fundamentals of photon momentum transfer in ionic matter., Published by Nature Publishing Group UK, [London]
Published: 2018
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39. Control of laser plasma accelerated electrons for light sources

Author: Victor Malka, Slava Smartsev, Patrick N'gotta, C. De Oliveira, Frederic Blache, François Polack, P. Berteaud, M. El Ajjouri, Clement Evain, Alain Lestrade, Sebastien Corde, Charles Bourassin-Bouchet, Keihan Tavakoli, Olivier Marcouillé, D. Dennetière, J. Vétéran, Fabien Briquez, Mourad Sebdaoui, T. El Ajjouri, Cédric Thaury, Igor Andriyash, Mathieu Valléau, Fabrice Marteau, A. Tafzi, N. Leclercq, F. Bouvet, L. Chapuis, Martin Khojoyan, Charles Kitegi, Christian Herbeaux, Nicolas Hubert, Julien Gautier, Jean-Philippe Goddet, Benoît Mahieu, Pascal Rousseau, K. Ta Phuoc, M. E. Couprie, Eléonore Roussel, Yannick Dietrich, Jean-Pierre Duval, Guillaume Lambert, C. Szwaj, C. Benabderrahmane, Marie Labat, Amin Ghaith, Patrick Rommeluère, Alexandre Loulergue, T. André, Serge Bielawski, Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), Université Paris-Saclay, Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 (PhLAM), Université de Lille-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'optique appliquée (LOA), École Nationale Supérieure de Techniques Avancées (ENSTA Paris)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Weizmann Institute of Science, Department of Physics of Complex Systems, Weizmann Institute of Science [Rehovot, Israël], European Project: 340015,EC:FP7:ERC,ERC-2013-ADG,COXINEL(2014), European Project: 339128,EC:FP7:ERC,ERC-2013-ADG,X-FIVE(2014), and European Project: 653782,H2020,H2020-INFRADEV-1-2014-1,EuPRAXIA(2015)
Subjects: Science, [PHYS.PHYS.PHYS-ACC-PH]Physics [physics]/Physics [physics]/Accelerator Physics [physics.acc-ph], General Physics and Astronomy, Synchrotron radiation, 7. Clean energy, 01 natural sciences, General Biochemistry, Genetics and Molecular Biology, Article, law.invention, Optics, [PHYS.PHYS.PHYS-PLASM-PH]Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph], law, 0103 physical sciences, lcsh:Science, 010306 general physics, Physics, Multidisciplinary, 010308 nuclear & particles physics, business.industry, Ultrafast electron diffraction, Free-electron laser, General Chemistry, Undulator, Laser, Betatron, Publisher Correction, Physics::Accelerator Physics, lcsh:Q, Laser beam quality, business, Beam (structure)
Abstract: With gigaelectron-volts per centimetre energy gains and femtosecond electron beams, laser wakefield acceleration (LWFA) is a promising candidate for applications, such as ultrafast electron diffraction, multistaged colliders and radiation sources (betatron, compton, undulator, free electron laser). However, for some of these applications, the beam performance, for example, energy spread, divergence and shot-to-shot fluctuations, need a drastic improvement. Here, we show that, using a dedicated transport line, we can mitigate these initial weaknesses. We demonstrate that we can manipulate the beam longitudinal and transverse phase-space of the presently available LWFA beams. Indeed, we separately correct orbit mis-steerings and minimise dispersion thanks to specially designed variable strength quadrupoles, and select the useful energy range passing through a slit in a magnetic chicane. Therefore, this matched electron beam leads to the successful observation of undulator synchrotron radiation after an 8 m transport path. These results pave the way to applications demanding in terms of beam quality., Electron beam quality in accelerators is crucial for light source application. Here the authors demonstrate beam conditioning of laser plasma electrons thanks to a specific transport line enabling the control of divergence, energy, steering and dispersion and the application to observe undulator radiation.
Published: 2018
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40. Soft X-Ray Second Harmonic Generation as an Interfacial Probe

Author: Richard J. Saykally, Luca Giannessi, Simone Spampinati, Anthony M. Rizzuto, Alessandro Gessini, M. B. Danailov, A. Simoncig, Walter S. Drisdell, Nicola Fabris, Giuseppe Penco, Claudio Masciovecchio, Dimosthenis Sokaras, C. J. Hull, Chaitanya Das Pemmaraju, Eléonore Roussel, Tod A. Pascal, Laura Foglia, Luca Poletto, David Prendergast, R. Mincigrucci, Dennis Nordlund, Sumana L. Raj, Enrico Allaria, Craig P. Schwartz, Bruno Diviacco, Emiliano Principi, Marcello Coreno, S. Di Mitri, Royce K. Lam, Paolo Miotti, Jacob W. Smith, Steven T. Christensen, M. Trovo, Tsu-Chien Weng, G. De Ninno, and Giannessi, L.
Subjects: General Physics, Materials science, business.industry, Free-electron laser, General Physics and Astronomy, Second-harmonic generation, 02 engineering and technology, 021001 nanoscience & nanotechnology, 01 natural sciences, Mathematical Sciences, Wavelength, Engineering, Optics, K-edge, Physical Sciences, 0103 physical sciences, soft X-ray spectroscopy, Graphite, Thin film, 010306 general physics, 0210 nano-technology, business, Fermi Gamma-ray Space Telescope, Coherence (physics)
Abstract: © 2018 American Physical Society. Nonlinear optical processes at soft x-ray wavelengths have remained largely unexplored due to the lack of available light sources with the requisite intensity and coherence. Here we report the observation of soft x-ray second harmonic generation near the carbon K edge (∼284 eV) in graphite thin films generated by high intensity, coherent soft x-ray pulses at the FERMI free electron laser. Our experimental results and accompanying first-principles theoretical analysis highlight the effect of resonant enhancement above the carbon K edge and show the technique to be interfacially sensitive in a centrosymmetric sample with second harmonic intensity arising primarily from the first atomic layer at the open surface. This technique and the associated theoretical framework demonstrate the ability to selectively probe interfaces, including those that are buried, with elemental specificity, providing a new tool for a range of scientific problems.
Published: 2018
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41. Two-photon absorption of soft X-ray free electron laser radiation by graphite near the carbon K-absorption edge

Author: Dimosthenis Sokaras, Claudio Masciovecchio, Royce K. Lam, A. Simoncig, Chaitanya Das Pemmaraju, Emiliano Principi, Paolo Miotti, Simone Spampinati, Giuseppe Penco, Tsu-Chien Weng, Anthony M. Rizzuto, Eléonore Roussel, Alessandro Gessini, Miltcho B. Danailov, Dennis Nordlund, Nicola Fabris, Giovanni De Ninno, Laura Foglia, C. J. Hull, David Prendergast, Richard J. Saykally, Craig P. Schwartz, Luca Giannessi, R. Mincigrucci, Simone Di Mitri, Marcello Coreno, Jacob W. Smith, Steven T. Christensen, Bruno Diviacco, Luca Poletto, Mauro Trovò, Sumana L. Raj, Walter S. Drisdell, Tod A. Pascal, and Giannessi, L.
Subjects: Technology, Materials science, Photon, Chemical Physics, Astrophysics::High Energy Astrophysical Phenomena, Free-electron laser, Absorption cross section, General Physics and Astronomy, Resonance, Physics::Optics, 02 engineering and technology, 021001 nanoscience & nanotechnology, 01 natural sciences, Two-photon absorption, Carbon film, Absorption edge, 0103 physical sciences, Physical Sciences, Chemical Sciences, soft X-ray spectroscopy, Physical and Theoretical Chemistry, Atomic physics, 010306 general physics, 0210 nano-technology, Absorption (electromagnetic radiation)
Abstract: We have examined the transmission of soft X-ray pulses from the FERMI free electron laser through carbon films of varying thickness, quantifying nonlinear effects of pulses above and below the carbon K-edge. At typical of soft X-ray free electron laser intensities, pulses exhibit linear absorption at photon energies above and below the K-edge, ∼308 and ∼260 eV, respectively; whereas two-photon absorption becomes significant slightly below the K-edge, ∼284.2 eV. The measured two-photon absorption cross section at 284.18 eV (∼6 × 10−48 cm4 s) is 7 orders of magnitude above what is expected from a simple theory based on hydrogen-like atoms – a result of resonance effects.
Published: 2018
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42. Characteristics and development of the coherent synchrotron radiation sources for THz spectroscopy

Author: Laurent Manceron, Pascal Roy, Christophe Szwaj, Marie-Agnès Tordeux, J. Barros, C. Evain, Serge Bielawski, Eléonore Roussel, J.-B. Brubach, Marie Labat, and M. E. Couprie
Subjects: Physics, Terahertz radiation, business.industry, Flux, Synchrotron radiation, Slicing, Atomic and Molecular Physics, and Optics, Optics, Optoelectronics, Physical and Theoretical Chemistry, business, Spectroscopy, Thz spectroscopy
Abstract: We report on the characteristics of coherent synchrotron radiation (CSR) as a source for spectroscopy. The optimization of the source and the resulting figures of merits in terms of flux, signal to noise, spatial distribution and spectral and temporal distribution are presented together with a spectroscopic application. The emission of THz during the slicing operation is also described. The conclusion opens up perspectives made possible by the availability of this intense and stable THz source.
Published: 2015
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43. Investigation of the Electrical Field Sensitivity of Sub-μm Y–Ba–Cu–O Detectors

Author: Konstantin Ilin, Heishun Zen, Serge Bielawski, M. Arndt, Michael Siegel, Eléonore Roussel, Stefan Wuensch, Artem Kuzmin, Anke-Susanne Müller, Taro Konomi, C. Szwaj, Shin-ichi Kimura, Kazumasa Iida, J. Raasch, Masahiro Katoh, Clement Evain, Johannes Steinmann, Naoto Yamamoto, Bernhard Holzapfel, Masahito Hosaka, and P. Thoma
Subjects: Materials science, Field (physics), business.industry, Terahertz radiation, Detector, Condensed Matter Physics, Synchrotron, Electronic, Optical and Magnetic Materials, law.invention, Full width at half maximum, law, Picosecond, Temporal resolution, Optoelectronics, Electrical and Electronic Engineering, business, Sensitivity (electronics)
Abstract: The behavior of submicrometer-sized thin-film YBa 2 Cu 3 O 7-x (YBCO) detectors under illumination with picosecond terahertz (THz) pulses was investigated. Real-time measurements with a temporal resolution of 15 ps full width at half maximum were performed at ANKA, the synchrotron facility of Karlsruhe Institute of Technology, and the UVSOR-III facility at the Institute for Molecular Science in Okazaki, Japan. The capability of YBCO detectors to reproduce the shape of a several picosecond long THz pulse was demonstrated. Single-shot measurements adhering to a reversal of the direction of the electrical field of the THz radiation were carried out. They provided evidence for the electrical field sensitivity of the YBCO detector. Exploiting the electrical field sensitivity of the YBCO detector, the effect of microbunching was observed at UVSOR-III.
Published: 2015
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44. Echo-enabled harmonic generation studies for the FERMI free-electron laser

Author: Giuseppe Penco, Enrico Allaria, Gregory Penn, Giovanni De Ninno, Primož Rebernik Ribič, Eléonore Roussel, and Luca Giannessi
Subjects: lcsh:Applied optics. Photonics, free-electron laser, harmonic up-conversion, high-harmonic generation, seeding, x-ray, pump-probe, microbunching instability, 01 natural sciences, law.invention, Optics, law, 0103 physical sciences, High harmonic generation, Radiology, Nuclear Medicine and imaging, 010306 general physics, Instrumentation, Physics, Water window, 010308 nuclear & particles physics, business.industry, Free-electron laser, lcsh:TA1501-1820, Laser, Atomic and Molecular Physics, and Optics, Extreme ultraviolet, Femtosecond, Optoelectronics, business, Ultrashort pulse, Fermi Gamma-ray Space Telescope
Abstract: © 2017 by the author. Studying ultrafast processes on the nanoscale with element specificity requires a powerful femtosecond source of tunable extreme-ultraviolet (XUV) or x-ray radiation, such as a free-electron laser (FEL). Current efforts in FEL development are aimed at improving the wavelength tunability and multicolor operation, which will potentially lead to the development of new characterization techniques offering a higher chemical sensitivity and improved spatial resolution. One of the most promising approaches is the echo-enabled harmonic generation (EEHG), where two external seed lasers are used to precisely control the spectro-temporal properties of the FEL pulse. Here, we study the expected performance of EEHG at the FERMI FEL, using numerical simulations. We show that, by employing the existing FERMI layout with minor modifications, the EEHG scheme will be able to produce gigawatt peak-power pulses at wavelengths as short as 5 nm. We discuss some possible detrimental effects that may affect the performance of EEHG and compare the results to the existing double-stage FEL cascade, currently in operation at FERMI. Finally, our simulations show that, after substantial machine upgrades, EEHG has the potential to deliver coherent multicolor pulses reaching wavelengths as short as 3 nm, enabling x-ray pump-x-ray probe experiments in the water window.
Published: 2017
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45. Unveiling relativistic electron bunch microstructures and their dynamical evolutions, using photonic time-stretch

Author: Patrik Schönfeldt, L. Cassinari, Marie-Emmanuelle Couprie, J. P. Ricaud, Jean-Blaise Brubach, C. Szwaj, Johannes Steinmann, Laurent Manceron, Marie-Agnès Tordeux, Pascale Roy, Clement Evain, Marc Le Parquier, Anke-Susanne Müller, Nicole Hiller, Serge Bielawski, Eléonore Roussel, Marie Labat, and Andrii Borysenko
Subjects: Physics, 010308 nuclear & particles physics, business.industry, Terahertz radiation, Resolution (electron density), Synchrotron radiation, Near and far field, Electron, 01 natural sciences, Optics, Beamline, Picosecond, 0103 physical sciences, Physics::Accelerator Physics, Photonics, 010306 general physics, business
Abstract: The photonic time-stretch technique allows electric field pulse shapes to be recorded with picosecond resolution, at megahertz acquisition rates. Using this strategy, we could directly record spatial patterns that spontaneously appear in relativistic electron bunches, and follow their dynamical evolution over time. We present recent results obtained using two strategies. At SOLEIL, we present the shapes of the THz pulses which are emitted by the structures, and detected far from the emission point, at the end of a beamline. At ANKA, we present how it has been possible to monitor directly the electron bunch near-field. These new types of single-shot recordings allow direct and stringent tests to be performed on electron bunch dynamical models in synchrotron radiation facilities.
Published: 2017
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46. Element Selective Probe of the Ultra-Fast Magnetic Response to an Element Selective Excitation in Fe-Ni Compounds Using a Two-Color FEL Source

Author: Giuseppe Penco, Carlo Spezzani, Emanuele Pedersoli, Enrico Allaria, Primož Rebernik Ribič, Alexander Demidovich, Miltcho B. Danailov, Ivaylo Nikolov, Eugenio Ferrari, Cristian Svetina, Luca Giannessi, Jean-Baptiste Moussy, Marco Zangrando, Maya Kiskinova, Franck Vidal, Michele Manfredda, Mauro Trovò, Renaud Delaunay, David Gauthier, Eléonore Roussel, Maurizio Sacchi, Franck Fortuna, Flavio Capotondi, Giovanni De Ninno, Lounès Lounis, Paolo Cinquegrana, Bruno Diviacco, Nicola Mahne, Tommaso Pincelli, Lorenzo Raimondi, Dipartimento di Fisica [Trieste], Università degli studi di Trieste, Elettra Sincrotrone Trieste, Laboratoire de Physique des Solides (LPS), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11), Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Laboratoire de Chimie Physique - Matière et Rayonnement (LCPMR), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Croissance et propriétés de systèmes hybrides en couches minces (INSP-E8), Institut des Nanosciences de Paris (INSP), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Nano-Magnétisme et Oxydes (LNO), Service de physique de l'état condensé (SPEC - UMR3680), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Institut Rayonnement Matière de Saclay (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Dipartimento di Fisica (Milano), Università degli Studi di Milano [Milano] (UNIMI), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL), Italian National agency for new technologies, Energy and sustainable economic development [Frascati] (ENEA), Laboratory of Quantum Optics, University of Nova Gorica, Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), European Project: 312284,EC:FP7:INFRA,FP7-INFRASTRUCTURES-2012-1,CALIPSO(2012), European Project: PEPS SASLELX, Università degli studi di Trieste = University of Trieste, Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), Università degli Studi di Milano = University of Milan (UNIMI), École normale supérieure - Paris (ENS-PSL), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Permalloy, lcsh:Applied optics. Photonics, Materials science, Kerr effect, Physics::Optics, 02 engineering and technology, free electron laser, 01 natural sciences, law.invention, Optics, law, 0103 physical sciences, Radiology, Nuclear Medicine and imaging, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], 010306 general physics, Instrumentation, two-color source, Scattering, business.industry, Free-electron laser, Resonance, lcsh:TA1501-1820, 021001 nanoscience & nanotechnology, Laser, Atomic and Molecular Physics, and Optics, Pulse (physics), Wavelength, Physics::Accelerator Physics, Atomic physics, 0210 nano-technology, business, ultra-fast dynamics
Abstract: The potential of the two-color mode implemented at the FERMI free-electron laser (FEL) source for pumping and probing selectively different atomic species has been demonstrated by time-resolved scattering experiments with permalloy (FeNi alloy) and NiFe 2 O 4 samples. We monitored the ultra-fast demagnetization of Ni induced by the pump FEL pulse, by tuning the linearly-polarized FEL probe pulse to the Ni-3p resonance and measuring the scattered intensity in the transverse magneto-optical Kerr effect geometry. The measurements were performed by varying the intensity of the FEL pump pulse, tuning its wavelength to and off of the Fe-3p resonance, and by spanning the FEL probe pulse delays across the 300–900 fs range. The obtained results have Photonics 2017, 4, 6 2 of 10 evidenced that for the case of NiFe 2 O 4 , there is a sensible difference in the magnetic response at the Ni site when the pump pulse causes electronic excitations at the Fe site.
Published: 2017
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47. Passive Linearization of the Magnetic Bunch Compression Using Self-Induced Fields

Author: M. Trovo, D. Gauthier, Ivan Cudin, Enrico Allaria, Simona Bettoni, Giuseppe Penco, Eléonore Roussel, S. Di Mitri, Paolo Craievich, Luca Giannessi, Eugenio Ferrari, Simone Spampinati, Laboratoire Interactions, Dynamiques et Lasers (ex SPAM) (LIDyl), Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS), Giannessi, L., and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, 010308 nuclear & particles physics, business.industry, [PHYS.PHYS.PHYS-ACC-PH]Physics [physics]/Physics [physics]/Accelerator Physics [physics.acc-ph], Phase (waves), General Physics and Astronomy, Electron, Laser, 01 natural sciences, Linear particle accelerator, law.invention, Optics, Classical mechanics, Linearization, law, 0103 physical sciences, Harmonic, Cathode ray, Physics::Accelerator Physics, 010306 general physics, business, Beam (structure)
Abstract: In linac-driven free-electron lasers, colliders, and energy recovery linacs, a common way to compress the electron bunch to kiloampere level is based upon the implementation of a magnetic dispersive element that converts particle energy deviation into a path-length difference. Nonlinearities of such a process are usually compensated by enabling a high harmonic rf structure properly tuned in amplitude and phase. This approach is however not straightforward, e.g., in C-band and X-band linacs. In this Letter we demonstrate that the longitudinal self-induced field excited by the electron beam itself is able to linearize the compression process without any use of high harmonic rf structure. The method is implemented at the FERMI linac, with the resulting high quality beam used to drive the seeded free-electron laser during user experiments. © 2017 American Physical Society.
Published: 2017
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48. Observation and Control of Laser-Enabled Auger Decay

Author: Oksana Plekan, Carlo Callegari, Andreas Fischer, Hamed Ahmadi, Paolo Carpeggiani, Enrico Ferrari, Antoine Comby, Anatoli Kheifets, Luca Giannessi, David Gauthier, Paola Finetti, Enrico Allaria, Kevin C. Prince, Tamás Csizmadia, S. Kuehn, Eléonore Roussel, Tommaso Mazza, E. Ovcharenko, D. Iablonskyi, Kenichi L. Ishikawa, Michael Meyer, Kiyoshi Ueda, Giuseppe Sansone, Maurizio Reduzzi, and Giannessi, L.
Subjects: Atomic Physics (physics.atom-ph), Complex system, Physics::Optics, FOS: Physical sciences, General Physics and Astronomy, chemistry.chemical_element, 02 engineering and technology, Electron, 01 natural sciences, Physics - Atomic Physics, law.invention, Auger, Neon, law, 0103 physical sciences, Physics::Atomic Physics, 010306 general physics, Physics, Phase difference, Electronic correlation, 021001 nanoscience & nanotechnology, Laser, chemistry, Atomic physics, 0210 nano-technology, Ultrashort pulse
Abstract: Single photon laser enabled Auger decay (spLEAD) has been redicted theoretically [Phys. Rev. Lett. 111, 083004 (2013)] and here we report its first experimental observation in neon. Using coherent, bichromatic free-electron laser pulses, we have detected the process and coherently controlled the angular distribution of the emitted electrons by varying the phase difference between the two laser fields. Since spLEAD is highly sensitive to electron correlation, this is a promising method for probing both correlation and ultrafast hole migration in more complex systems., Comment: 5 pages, 3 figures
Published: 2017
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49. Skew Quadrupole Effect of Laser Plasma Electron Beam Transport

Author: Jean-Philippe Goddet, Amin Ghaith, Driss Oumbarek Espinos, Alexandre Loulergue, Charles Kitegi, Fabrice Marteau, Amar Tafzi, Olena Kononenko, Marie Labat, Thomas André, Victor Malka, Marie-Emmanuelle Couprie, Guillaume Lambert, Cédric Thaury, Mathieu Valléau, Alain Lestrade, Sebastien Corde, Mourad Sebdaoui, Frederic Blache, Eléonore Roussel, Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), Département d'Économie de l'École Polytechnique (X-DEP-ECO), École polytechnique (X), Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 (PhLAM), Université de Lille-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'optique appliquée (LOA), and École Nationale Supérieure de Techniques Avancées (ENSTA Paris)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Brightness, multipolar terms, free electron laser, Electron, lcsh:Technology, 01 natural sciences, law.invention, lcsh:Chemistry, Optics, law, 0103 physical sciences, quadrupole, General Materials Science, 010306 general physics, lcsh:QH301-705.5, Instrumentation, laser plasma acceleration, Fluid Flow and Transfer Processes, Physics, [PHYS.PHYS]Physics [physics]/Physics [physics], lcsh:T, 010308 nuclear & particles physics, business.industry, Process Chemistry and Technology, General Engineering, Skew, Free-electron laser, Laser, Plasma acceleration, lcsh:QC1-999, Computer Science Applications, lcsh:Biology (General), lcsh:QD1-999, lcsh:TA1-2040, magnetism, Physics::Accelerator Physics, electron beam transport, lcsh:Engineering (General). Civil engineering (General), business, lcsh:Physics, Beam (structure), Beam divergence
Abstract: International audience; Laser plasma acceleration (LPA) capable of providing femtosecond and GeV electron beams in cm scale distances brings a high interest for different applications, such as free electron laser and future colliders. Nevertheless, LPA high divergence and energy spread require an initial strong focus to mitigate the chromatic effects. The reliability, in particular with the pointing fluctuations, sets a real challenge for the control of the dispersion along the electron beam transport. We examine here how the magnetic defects of the first strong quadrupoles, in particular, the skew terms, can affect the brightness of the transported electron beam, in the case of the COXINEL transport line, designed for manipulating the electron beam properties for a free electron laser application. We also show that the higher the initial beam divergence, the larger the degradation. Experimentally, after having implemented a beam pointing alignment compensation method enabling us to adjust the position and dispersion independently, we demonstrate that the presence of non-negligible skew quadrupolar components induces a transversal spread and tilt of the beam, leading to an emittance growth and brightness reduction. We are able to reproduce the measurements with beam transport simulations using the measured electron beam parameters.
Published: 2019
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50. High-Speed Y–Ba–Cu–O Direct Detection System for Monitoring Picosecond THz Pulses

Author: Vitali Judin, C. Szwaj, Heinz-Wilhelm Hübers, Naoto Yamamoto, Masahiro Katoh, Masahiro Adachi, A.-S. Müller, S. Tanaka, Masahito Hosaka, Stefan Wünsch, P. Thoma, Alexander Scheuring, Nigel Smale, A. D. Semenov, Shin-ichi Kimura, Eléonore Roussel, Konstantin Ilin, Serge Bielawski, and Michael Siegel
Subjects: Cryostat, Radiation, Materials science, Physics::Instrumentation and Detectors, Terahertz radiation, business.industry, Detector, Physics::Optics, Synchrotron radiation, YBa2Cu3O7-δ terahertz picosecond pulses, Full width at half maximum, Optics, Picosecond, Temporal resolution, Physics::Accelerator Physics, Time domain, Electrical and Electronic Engineering, business
Abstract: A high-speed YBa2Cu3O7-δ direct detection system was developed to monitor terahertz picosecond pulses in the time domain. High-TC superconducting thin-film YBa2Cu3O7-δ microbridges with critical temperatures of TC = 85 K were embedded into a planar log-spiral antenna to couple the broadband terahertz radiation (0.1 -2 THz) of several picosecond pulsed sources. The YBa2Cu3O7-δ detectors were installed in a liquid nitrogen cryostat equipped with 18 GHz effective bandwidth readout electronics. THz pulses generated at the electron storage rings ANKA and UVSOR-II have been resolved with a temporal resolution of 30 ps (full width at half maximum) limited by the readout electronics bandwidth. Beam dynamic effects of bursting coherent synchrotron radiation were successfully monitored.
Published: 2013
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