5 results on '"Povolo, L."'
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2. Pulsed Production of Antihydrogen in AEgIS
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Zurlo, N., Amsler, C., Antonello, M., Belov, A., Bonomi, G., Brusa, R. S., Caccia, M., Camper, A., Caravita, R., Castelli, F., Cheinet, P., Comparat, D., Consolati, G., Demetrio, A., Di Noto, L., Doser, M., Fani, M., Ferragut, R., Fesel, J., Gerber, S., Giammarchi, M., Gligorova, A., Gloggler, L. T., Guatieri, F., Haider, S., Hinterberger, A., Kellerbauer, A., Khalidova, O., Krasnicky, D., Lagomarsino, V., Malbrunot, C., Mariazzi, S., Matveev, V., Muller, R., Nebbia, G., Nedelec, P., Nowak, L., Oberthaler, M., Oswald, E., Pagano, D., Penasa, L., Petracek, V., Povolo, L., Prelz, F., Prevedelli, M., Rienacker, B., Rohne, O. M., Rotondi, A., Sandaker, H., Santoro, R., Testera, G., Tietje, I. C., Toso, V., Wolz, T., Yzombard, P., and Zimmer, C.
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Antihydrogen ,antiprotons ,Accelerators and Storage Rings ,Antihydrogen, antiprotons - Abstract
Cold antihydrogen atoms are a powerful tool to probe the validity of fundamental physics laws, and it's clear that colder atoms, generally speaking, allow an increased level of precision. After the first production of cold antihydrogen ($\bar{H}$) in 2002, experimental efforts have progressed continuously (trapping, beam formation, spectroscopy), with competitive results already achieved by adapting to cold antiatoms techniques previously well developed for ordinary atoms. Unfortunately, the number of $\bar{H}$ atoms that can be produced in dedicated experiments is many orders of magnitude smaller than available hydrogen atoms, which are at hand in large amount, so the development of novel techniques that allow the production of $\bar{H}$ with well defined conditions (and possibly control its formation time and energy levels) is essential to improve the sensitivity of the methods applied by the different experiments. We present here the first experimental results concerning the production of $\bar{H}$ in a pulsed mode where the time when 90\% of the atoms are produced is known with an uncertainty of around 250~ns. The pulsed $\bar{H}$ source is generated by the charge-exchange reaction between Rydberg positronium atoms ($Ps$) and trapped antiprotons ($\bar{p}$), cooled and manipulated in an electromagnetic trap: $$ \bar{ p}+Ps^* \rightarrow \bar{H}^* + e^- $$ where Rydberg positronium atoms, in turn, are produced through the implantation of a pulsed positron beam into a mesoporous silica target, and are excited by two subsequent laser pulses, the first to $n=3$, the second to the needed Rydberg level ($n \simeq 17$). The pulsed production allows the control of the antihydrogen temperature, and facilitates the tunability of the Rydberg states, their de-excitation by pulsed lasers and the manipulation through electric field gradients. In fact, the production of pulsed antihydrogen is a major milestone in the AEgIS experiment to perform direct measurements of the validity of the Weak Equivalence Principle for antimatter.
- Published
- 2022
3. Control system for ion Penning traps at the AEgIS experiment at CERN
- Author
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Nowicka, D, Bergmann, B, Bonomi, G, Brusa, R S, Burian, P, Camper, A, Caravita, R, Castelli, F, Cheinet, P, Comparat, D, Consolati, G, Doser, M, Gjersdal, H, Glöggler, L, Graczykowski, Ł, Guatieri, F, Haider, S, Huck, S, Janik, M, Kasprowicz, G, Khatri, G, Kornakov, G, Malbrunot, C, Mariazzi, S, Nebbia, G, Nowak, L, Oswald, E, Pagano, D, Penasa, L, Pospisil, S, Povolo, L, Prelz, F, Rienäcker, B, Røhne, O M, Sandaker, H, Stekl, I, Tefelski, D, Volponi, M, Wolz, T, Zimmer, C, and Zurlo, N
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antihydrogen ,History ,Antiproton Decelerator ,CERN ,Detectors and Experimental Techniques ,530 Physik ,ion Penning traps ,Quantum Technology ,AEgIS experiment ,Computer Science Applications ,Education - Abstract
The AEgIS experiment located at the Antiproton Decelerator at CERN aims to measure the gravitational fall of a cold antihydrogen pulsed beam. The precise observation of the antiatoms in the Earth gravitational field requires a controlled production and manipulation of antihydrogen. The neutral antimatter is obtained via a charge exchange reaction between a cold plasma of antiprotons from ELENA decelerator and a pulse of Rydberg positronium atoms. The current custom electronics designed to operate the 5 and 1 T Penning traps are going to be replaced by a control system based on the ARTIQ & Sinara open hardware and software ecosystem. This solution is present in many atomic, molecular and optical physics experiments and devices such as quantum computers. We report the status of the implementation as well as the main features of the new control system.
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- 2022
4. Developments for pulsed antihydrogen production towards direct gravitational measurement on antimatter
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Alberto Rotondi, S. Müller, G. Nebbia, Davide Pagano, O. Khalidova, Massimo Caccia, L. Povolo, Giovanni Consolati, V. Toso, Germano Bonomi, Heidi Sandaker, V. Petráček, A. Hinterberger, L. T. Glöggler, Sebastiano Mariazzi, B. Rienäcker, C. Zimmer, L. Di Noto, Marco Giammarchi, Marco Prevedelli, M. Antonello, Chloé Malbrunot, G. Testera, Angela Gligorova, Ole Røhne, Nicola Zurlo, Sebastian Gerber, Fabrizio Castelli, Alban Kellerbauer, A. S. Belov, I. C. Tietje, D. Krasnicky, V. Lagomarsino, M. Fanì, L. Nowak, Romualdo Santoro, Michael Doser, Patrick Nedelec, E. Oswald, J. Fesel, V. Matveev, S. Haider, P. Cheinet, A. Demetrio, F. Guatieri, Luca Penasa, A. Camper, F. Prelz, Daniel Comparat, Ruggero Caravita, T. Wolz, Markus K. Oberthaler, R. S. Brusa, Rafael Ferragut, Fani M., Antonello M., Belov A., Bonomi G., Brusa R.S., Caccia M., Camper A., Caravita R., Castelli F., Comparat D., Cheinet P., Consolati G., Demetrio A., Di Noto L., Doser M., Ferragut R., Fesel J., Gerber S., Giammarchi M., Gligorova A., Gloggler L.T., Guatieri F., Haider S., Hinterberger A., Kellerbauer A., Khalidova O., Krasnicky D., Lagomarsino V., Malbrunot C., Nowak L., Mariazzi S., Matveev V., Muller S.R., Nebbia G., Nedelec P., Oberthaler M., Oswald E., Pagano D., Penasa L., Petracek V., Povolo L., Prelz F., Prevedelli M., Rienacker B., Rohne O.M., Rotondi A., Sandaker H., Santoro R., Testera G., Tietje I.C., Toso V., Wolz T., Zimmer C., Zurlo N., Laboratoire Aimé Cotton (LAC), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-École normale supérieure - Cachan (ENS Cachan), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)
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Gravity (chemistry) ,Physics::General Physics ,Antimatter ,experimental methods ,Gravity ,Antiproton ,magnetic field ,Positronium ,01 natural sciences ,010305 fluids & plasmas ,Nuclear physics ,Gravitation ,temperature: low ,0103 physical sciences ,general relativity ,[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex] ,Physics::Atomic and Molecular Clusters ,Physics::Atomic Physics ,010306 general physics ,Antihydrogen ,Mathematical Physics ,Physics ,gravitation: interaction ,antihydrogen: production ,talk: Kolymbari 2019/08/21 ,sensitivity ,charge exchange ,Condensed Matter Physics ,pulsed ,Atomic and Molecular Physics, and Optics ,anti-p ,equivalence principle ,gravitation: acceleration ,gravitation: local ,experimental results - Abstract
International audience; A main scientific goal of the experiment is the direct measurement of the Earth’s local gravitational acceleration g on antihydrogen. The Weak Equivalence Principle is a foundation of General Relativity. It has been extensively tested with ordinary matter but very little is known about the gravitational interaction between matter and antimatter. Antihydrogen is produced in via resonant charge-exchange reaction between cold Rydberg-excited positronium and cooled down antiprotons. The achievements for the development of a pulsed cold antihydrogen source are presented. Large number of antiprotons, necessary for a significant production rate of antihydrogen, are captured, accumulated, compressed and cooled over an extended period of time. Positronium (Ps) is formed through e$^{+}$-Ps conversion in a silica porous target at 10 K temperature in a reflection geometry inside the main apparatus. The so-formed Ps cloud is then laser-excited to Rydberg levels, for the first time in a 1 T magnetic field. Consequently, a detailed characterization of the Ps source for antihydrogen production in magnetic field needed to be performed. Several detection techniques are extensively used to monitor antiproton and positron manipulations in the formation process of antihydrogen inside the main apparatus. Positronium detection techniques underwent extensive improvements in sensitivity during the last antiproton run. At the same time, major efforts to improve integrate and commission the detectors sensitive to antihydrogen production took place.
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- 2020
5. Characterization of a transmission positron/positronium converter for antihydrogen production
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Victor Matveev, Paola Scampoli, Tomoko Ariga, Ulrik I. Uggerhøj, S. Haider, Claude Amsler, S.R. Müller, G. Nebbia, J. Fesel, Ole Røhne, B. Rienäcker, Roberto S. Brusa, Z. Mazzotta, G. Testera, Eberhard Widmann, Rafael Ferragut, V. Petracek, Giovanni Cerchiari, Felice Sorrentino, Romualdo Santoro, V. Lagomarsino, Alban Kellerbauer, L. Resch, S.L. Andersen, N. Pacifico, Luca Penasa, F. Lyckegaard, F. Prelz, Fabrizio Castelli, Stefano Aghion, J. Robert, D. Krasnický, A. Demetrio, Sebastiano Mariazzi, C. Evans, L. Ravelli, L. Di Noto, Michael Doser, Ruggero Caravita, Davide Pagano, P. Lebrun, C. Zimmer, Giovanni Consolati, Jacques Chevallier, Germano Bonomi, P. Lansonneur, Massimo Caccia, Sebastian Gerber, Marco Giammarchi, Daniel Comparat, Heidi Sandaker, Antonio Ereditato, M. Sacerdoti, M. C. Simon, F. Guatieri, Nicola Zurlo, Marco Prevedelli, H. Holmestad, L. Povolo, Chloé Malbrunot, I. C. Tietje, Adriano Fontana, Alberto Rotondi, A. Hinterberger, L. Smestad, Patrick Nedelec, Johann Zmeskal, M. Oberthaler, Angela Gligorova, P. Yzombard, Université Paris-Sud - Paris 11 (UP11), Laboratoire Aimé Cotton (LAC), École normale supérieure - Cachan (ENS Cachan)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Aghion, S., Amsler, C., Ariga, T., Bonomi, G., Brusa, R.S., Caccia, M., Caravita, R., Castelli, F., Cerchiari, G., Comparat, D., Consolati, G., Demetrio, A., Di Noto, L., Doser, M., Ereditato, A., Evans, C., Ferragut, R., Fesel, J., Fontana, A., Gerber, S., Giammarchi, M., Gligorova, A., Guatieri, F., Haider, S., Hinterberger, A., Holmestad, H., Kellerbauer, A., Krasnický, D., Lagomarsino, V., Lansonneur, P., Lebrun, P., Malbrunot, C., Mariazzi, S., Matveev, V., Mazzotta, Z., Müller, S.R., Nebbia, G., Nedelec, P., Oberthaler, M., Pacifico, N., Pagano, D., Penasa, L., Petracek, V., Povolo, L., Prelz, F., Prevedelli, M., Ravelli, L., Resch, L., Rienäcker, B., Robert, J., Røhne, O.M., Rotondi, A., Sacerdoti, M., Sandaker, H., Santoro, R., Scampoli, P., Simon, M., Smestad, L., Sorrentino, F., Testera, G., Tietje, I.C., Widmann, E., Yzombard, P., Zimmer, C., Zmeskal, J., Zurlo, N., Andersen, S.L., Chevallier, J., Uggerhøj, U.I., Lyckegaard, F., Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-École normale supérieure - Cachan (ENS Cachan), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Brusa, R. S., Müller, S. R., Røhne, O. M., Scampoli, Paola, Tietje, I. C., Andersen, S. L., and Uggerhøj, U. I.
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Photomultiplier ,COLLISIONS ,Positronium, Transmission, Antihydrogen ,Nuclear and High Energy Physics ,GRAPHITE ,Astrophysics::High Energy Astrophysical Phenomena ,BEAM ,[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] ,Kinetic energy ,Positronium ,01 natural sciences ,Secondary electrons ,010305 fluids & plasmas ,SECONDARY-ELECTRON EMISSION ,Positron ,POSITRON-ANNIHILATION ,THIN-FILMS ,0103 physical sciences ,Transmission ,Antihydrogen ,mesa-structured silica ,010306 general physics ,COLD ,Instrumentation ,Physics ,PLASMA ,Scattering ,SURFACES ,positronium, mesa-structured silica ,TRANSPORT ,Time of flight ,Physics::Accelerator Physics ,Atomic physics - Abstract
In this work a characterization study of forward emission from a thin, meso-structured silica Received 17 March 2017 positron/positronium (Ps) converter following implantation of positrons in light of possible antihydrogen production is presented. The target consisted of a similar to 1 mu m thick ultraporous silica film e-gun evaporated onto a 20 nm carbon foil. The Ps formation and emission was studied via Single Shot Positron Annihilation Lifetime Spectroscopy measurements after implantation of pulses with 3 4.10(7) positrons and 10 ns temporal width. The forward emission of implanted positrons and secondary electrons was investigated with a micro-channel plate phosphor screen assembly, connected either to a CCD camera for imaging of the impinging particles, or to a fast photomultiplier tube to extract information about their time of flight. The maximum Ps formation fraction was estimated to be similar to 10%. At least 10% of the positrons implanted with an energy of 3.3 keV are forward-emitted with a scattering angle smaller than 50 and maximum kinetic energy of 1.2 keV. At least 0.1-0.2 secondary electrons per implanted positron were also found to be forward-emitted with a kinetic energy of a few eV. The possible application of this kind of positron/positronium converter for antihydrogen production is discussed. (C) 2017 Elsevier B.V. All rights reserved.
- Published
- 2017
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