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5 results on '"Lennart Wollenweber"'

1. A von Hámos spectrometer for diamond anvil cell experiments at the High Energy Density Instrument of the European X-ray Free-Electron Laser

Author

Johannes M. Kaa, Zuzana Konôpková, Thomas R. Preston, Valerio Cerantola, Christoph J. Sahle, Mirko Förster, Christian Albers, Lélia Libon, Robin Sakrowski, Lennart Wollenweber, Khachiwan Buakor, Anand Dwivedi, Mikhail Mishchenko, Motoaki Nakatsutsumi, Christian Plückthun, Jan-Patrick Schwinkendorf, Georg Spiekermann, Nicola Thiering, Sylvain Petitgirard, Metin Tolan, Max Wilke, Ulf Zastrau, Karen Appel, and Christian Sternemann

Subjects
x-ray spectroscopy, x-ray diffraction, inelastic x-ray scattering, diamond anvil cell, spectrometers, imaging spectroscopy, x-ray detectors, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798, Crystallography, QD901-999
Abstract

A von Hámos spectrometer has been implemented in the vacuum interaction chamber 1 of the High Energy Density instrument at the European X-ray Free-Electron Laser facility. This setup is dedicated, but not necessarily limited, to X-ray spectroscopy measurements of samples exposed to static compression using a diamond anvil cell. Si and Ge analyser crystals with different orientations are available for this setup, covering the hard X-ray energy regime with a sub-eV energy resolution. The setup was commissioned by measuring various emission spectra of free-standing metal foils and oxide samples in the energy range between 6 and 11 keV as well as low momentum-transfer inelastic X-ray scattering from a diamond sample. Its capabilities to study samples at extreme pressures and temperatures have been demonstrated by measuring the electronic spin-state changes of (Fe0.5Mg0.5)O, contained in a diamond anvil cell and pressurized to 100 GPa, via monitoring the Fe Kβ fluorescence with a set of four Si(531) analyser crystals at close to melting temperatures. The efficiency and signal-to-noise ratio of the spectrometer enables valence-to-core emission signals to be studied and single pulse X-ray emission from samples in a diamond anvil cell to be measured, opening new perspectives for spectroscopy in extreme conditions research.

Published
2023
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2. The High Energy Density Scientific Instrument at the European XFEL

Author

M. Hassan, Lennart Wollenweber, A. Laso Garcia, I. Thorpe, Ulrich Schramm, M. Toncian, Hauke Höppner, Motoaki Nakatsutsumi, Karen Appel, J. Hauser, T. Herrmannsdörfer, Clemens Prescher, T. Feldmann, S. Dietrich, M. Foese, Mohammadreza Banjafar, K. Sukharnikov, Carsten Baehtz, M. Röper, Ulf Zastrau, P. Talkovski, W. Seidel, Lewis Batchelor, S. Findeisen, O. Baehr, T. Toncian, P. Kaever, Erik Brambrink, H.-O. Engel, D. Fulla-Marsa, E.-C. Martens, J. Dreyer, Johannes Kaa, A. Schmidt, Valerio Cerantola, M. Makita, J. P. Schwinkendorf, A. Schropp, C. Strohm, Thomas E. Cowan, A. Pelka, Markus O. Schoelmerich, Hanns-Peter Liermann, H. Damker, Emma McBride, T. R. Preston, D. Möller, Sebastian Göde, S. Di Dio Cafiso, Zuzana Konôpková, J. Mainberger, Thomas Tschentscher, K. Knöfel, Sh. Yamamoto, C. Plueckthun, A. Berghäuser, Zastrau, U, Appel, K, Baehtz, C, Baehr, O, Batchelor, L, Berghäuser, A, Banjafar, M, Brambrink, E, Cerantola, V, Cowan, T, Damker, H, Dietrich, S, Di Dio Cafiso, S, Dreyer, J, Engel, H, Feldmann, T, Findeisen, S, Foese, M, Fulla-Marsa, D, Göde, S, Hassan, M, Hauser, J, Herrmannsdörfer, T, Höppner, H, Kaa, J, Kaever, P, Knöfel, K, Konôpková, Z, Laso García, A, Liermann, H, Mainberger, J, Makita, M, Martens, E, Mcbride, E, Möller, D, Nakatsutsumi, M, Pelka, A, Plueckthun, C, Prescher, C, Preston, T, Röper, M, Schmidt, A, Seidel, W, Schwinkendorf, J, Schoelmerich, M, Schramm, U, Schropp, A, Strohm, C, Sukharnikov, K, Talkovski, P, Thorpe, I, Toncian, M, Toncian, T, Wollenweber, L, Yamamoto, S, and Tschentscher, T

Subjects
Pulse repetition frequency, Nuclear and High Energy Physics, Astrophysics::High Energy Astrophysical Phenomena, law.invention, high-pressure science, Optics, law, ddc:550, relativistic laser-matter interaction, Spontaneous emission, Instrumentation, Scientific instrument, Physics, high energy density, Radiation, Spectrometer, business.industry, relativistic laser–matter interaction, Warm dense matter, Laser, Research Papers, warm dense matter, State of matter, X-ray free-electron laser, X-ray free-electron lasers, business, Ultrashort pulse
Abstract

Journal of synchrotron radiation 28(5), 28 (2021). doi:10.1107/S1600577521007335, The European XFEL delivers up to 27000 intense (>1012 photons) pulses per second, of ultrashort (≤50 fs) and transversely coherent X-ray radiation, at a maximum repetition rate of 4.5 MHz. Its unique X-ray beam parameters enable groundbreaking experiments in matter at extreme conditions at the High Energy Density (HED) scientific instrument. The performance of the HED instrument during its first two years of operation, its scientific remit, as well as ongoing installations towards full operation are presented. Scientific goals of HED include the investigation of extreme states of matter created by intense laser pulses, diamond anvil cells, or pulsed magnets, and ultrafast X-ray methods that allow their diagnosis using self-amplified spontaneous emission between 5 and 25 keV, coupled with X-ray monochromators and optional seeded beam operation. The HED instrument provides two target chambers, X-ray spectrometers for emission and scattering, X-ray detectors, and a timing tool to correct for residual timing jitter between laser and X-ray pulses., Published by Wiley-Blackwell, [S.l.]

Published
2021
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3. Publisher's Note: 'High-resolution inelastic x-ray scattering at the high energy density scientific instrument at the European X-Ray Free-Electron Laser' [Rev. Sci. Instrum. 92, 013101 (2021)]

Author

Karen Appel, Dirk O. Gericke, David McGonegle, Ingo Uschmann, T. R. Preston, Ulf Zastrau, Charlotte Palmer, I. Thorpe, Zuzana Konôpková, Sebastian Göde, Jon Eggert, R. Loetzsch, Thomas Tschentscher, Benjamin K. Ofori-Okai, Luke Fletcher, A. Jenei, Berit Marx-Glowna, G. Geloni, Valerio Cerantola, S. H. Glenzer, Oliver Humphries, J. B. Hastings, Gianluca Gregori, Justin Wark, Adrien Descamps, Giulio Monaco, O. Karnbach, Thomas G. White, Emma McBride, Ronald Redmer, Lennart Wollenweber, C. Plückthun, C. Strohm, and Andrew Comley

Subjects
Physics, Scientific instrument, Scattering, Energy density, Free-electron laser, X-ray, High resolution, Atomic physics, ddc:620, Instrumentation
Abstract

Review of scientific instruments 92(3), 039901 (2021). doi:10.1063/5.0043951, This article was originally published online on 4 January 2021 with an error in the title and Ref. 6 should have been deleted from the reference section and the text. The title is correct above. All online and printed versions of the article were corrected on 7 January 2021. AIP Publishing apologizes for this error., Published by American Institute of Physics, [S.l.]

Published
2021
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4. High-resolution inelastic x-ray scattering at the high energy density scientific instrument at the European X-Ray Free-Electron Laser

Author

C. Plückthun, Sebastian Göde, Karen Appel, Benjamin K. Ofori-Okai, C. Strohm, Ulf Zastrau, Adrien Descamps, Andrew Comley, Gianluca Gregori, Ingo Uschmann, O. Karnbach, Charlotte Palmer, Lennart Wollenweber, Oliver Humphries, Ronald Redmer, David McGonegle, Justin Wark, Thomas G. White, Luke Fletcher, Jerome B. Hastings, A. Jenei, G. Geloni, Giulio Monaco, Berit Marx-Glowna, Zuzana Konôpková, Jon Eggert, R. Loetzsch, Thomas Tschentscher, Valerio Cerantola, S. H. Glenzer, Dirk O. Gericke, T. R. Preston, Emma McBride, I. Thorpe, Wollenweber, L, Preston, T, Descamps, A, Cerantola, V, Comley, A, Eggert, J, Fletcher, L, Geloni, G, Gericke, D, Glenzer, S, G??de, S, Hastings, J, Humphries, O, Jenei, A, Karnbach, O, Konopkova, Z, Loetzsch, R, Marx-Glowna, B, Mcbride, E, Mcgonegle, D, Monaco, G, Ofori-Okai, B, Palmer, C, Pl??ckthun, C, Redmer, R, Strohm, C, Thorpe, I, Tschentscher, T, Uschmann, I, Wark, J, White, T, Appel, K, Gregori, G, and Zastrau, U

Subjects
Spectrum analyzer, Materials science, Inelastic scattering, 01 natural sciences, monochromator, 010305 fluids & plasmas, law.invention, Optics, law, 0103 physical sciences, Spectral resolution, Instrumentation, Monochromator, 010302 applied physics, business.industry, Scattering, XFEL, Resolution (electron density), Free-electron laser, Laser, ddc:620, business, IXS
Abstract

Review of scientific instruments 92(1), 013101 (2021). doi:10.1063/5.0022886, We introduce a setup to measure high-resolution inelastic x-ray scattering at the High Energy Density scientific instrument at the European X-Ray Free-Electron Laser (XFEL). The setup uses the Si (533) reflection in a channel-cut monochromator and three spherical diced analyzer crystals in near-backscattering geometry to reach a high spectral resolution. An energy resolution of 44 meV is demonstrated for the experimental setup, close to the theoretically achievable minimum resolution. The analyzer crystals and detector are mounted on a curved-rail system, allowing quick and reliable changes in scattering angle without breaking vacuum. The entire setup is designed for operation at 10 Hz, the same repetition rate as the high-power lasers available at the instrument and the fundamental repetition rate of the European XFEL. Among other measurements, it is envisioned that this setup will allow studies of the dynamics of highly transient laser generated states of matter., Published by American Institute of Physics, [S.l.]

Published
2021
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5. An approach for the measurement of the bulk temperature of single crystal diamond using an X-ray free electron laser

Author

Charlotte Palmer, Luke Fletcher, Giulio Monaco, Siegfried Glenzer, Thomas G. White, C. Plueckthun, Ingo Uschmann, David McGonegle, C. Strohm, Karen Appel, Gianluca Gregori, Sebastian Göde, Jerome B. Hastings, Benjamin K. Ofori-Okai, Ulf Zastrau, Justin Wark, Debbie G. Senesky, Adrien Descamps, O. Karnbach, Oliver Humphries, Jon Eggert, R. Loetzsch, Emma McBride, Amy Lazicki, Valerio Cerantola, Lennart Wollenweber, Dirk O. Gericke, T. R. Preston, Ronald Redmer, Andrew Comley, Descamps, A, Ofori-Okai, B, Appel, K, Cerantola, V, Comley, A, Eggert, J, Fletcher, L, Gericke, D, Göde, S, Humphries, O, Karnbach, O, Lazicki, A, Loetzsch, R, Mcgonegle, D, Palmer, C, Plueckthun, C, Preston, T, Redmer, R, Senesky, D, Strohm, C, Uschmann, I, White, T, Wollenweber, L, Monaco, G, Wark, J, Hastings, J, Zastrau, U, Gregori, G, Glenzer, S, and Mcbride, E

Subjects
0301 basic medicine, Equation of state, Materials science, Phonon, x-ray heating, Bulk temperature, lcsh:Medicine, Neutron scattering, engineering.material, Temperature measurement, Article, Techniques and instrumentation, 03 medical and health sciences, 0302 clinical medicine, diamond, Condensed-matter physics, lcsh:Science, General, Multidisciplinary, Scattering, XFEL, Physics, lcsh:R, Diamond, Detailed balance, 030104 developmental biology, engineering, lcsh:Q, Atomic physics, ddc:600, 030217 neurology & neurosurgery, IXS
Abstract

Scientific reports 10(1), 14564 (2020). doi:10.1038/s41598-020-71350-x, Published by Macmillan Publishers Limited, part of Springer Nature, [London]

Published
2020
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