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12 results on '"gravitation: acceleration"'

1. Developments for pulsed antihydrogen production towards direct gravitational measurement on antimatter

Author

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)

Subjects
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.

Published
2020
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2. Protocol for pulsed antihydrogen production in the AE$\overline{g}$IS apparatus

Author

Tietje, I.C., 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., Noto, L.Di, Doser, M., Fanì, M., Ferragut, R., Fesel, J., Gerber, S., Giammarchi, M., Gligorova, A., Glöggler, L.T., Guatieri, F., Haider, S., Hinterberger, A., Kellerbauer, A., Khalidova, O., Krasnický, D., Lagomarsino, V., Malbrunot, C., Nowak, L., Mariazzi, S., Matveev, V., Müller, S.R., Nebbia, G., Nedelec, P., Oberthaler, M., Oswald, E., Pagano, D., Penasa, L., Petracek, V., Povolo, L., Prelz, F., Prevedelli, M., Rienäcker, B., Røhne, O.M., Rotondi, A., Sandaker, H., Santoro, R., Testera, G., Toso, V., Wolz, T., Yzombard, P., 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 des 2 Infinis de Lyon (IP2I Lyon), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)

Subjects
velocity, experimental methods, antihydrogen: production, deflection, gravitation: acceleration, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], beam: pulsed, anti-p: acceleration, time-of-flight, talk, anti-p p: annihilation, antihydrogen: acceleration, Particle Physics - Experiment
Abstract

International audience; The AEḡIS collaboration’s main goal is to measure the acceleration of antihydrogen it ($\textit{H}$) due to gravity. The experimental scheme is to form a pulsed beam whose vertical deflection is then measured by means of a moiré deflectometer [1]. Creating pulsed $\textit{H}$is crucial since it allows a velocity measurement of the antiatoms via time of flight ($\mathrm{ToF}$) necessary to deduce the gravitational acceleration ḡ from the vertical deflection $\Delta\mathit{s}$. The aim of this article is to outline the experimental protocol leading up to pulsed antihydrogen production in the AEḡIS experiment.

Published
2020
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3. Are Milky-Way dwarf-spheroidal galaxies dark-matter free?

Author

Hammer, F., Yang, Y.B., Wang, J.L., Arenou, F., Babusiaux, C., Puech, M., Flores, H., Galaxies, Etoiles, Physique, Instrumentation (GEPI), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Centre National de la Recherche Scientifique (CNRS), Institut de Planétologie et d'Astrophysique de Grenoble (IPAG), Centre National d'Études Spatiales [Toulouse] (CNES)-Université Grenoble Alpes (UGA)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire des Sciences de l'Univers de Grenoble (OSUG), Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Centre National d'Études Spatiales [Toulouse] (CNES)-Observatoire des Sciences de l'Univers de Grenoble (OSUG ), and Institut national des sciences de l'Univers (INSU - CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Grenoble Alpes (UGA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Grenoble Alpes (UGA)

Subjects
scaling, galaxy: dark matter, the Milky Way, FOS: Physical sciences, General Relativity and Quantum Cosmology (gr-qc), Astrophysics::Cosmology and Extragalactic Astrophysics, star: formation, Astrophysics - Astrophysics of Galaxies, General Relativity and Quantum Cosmology, dark matter, High Energy Physics - Phenomenology, dwarf galaxies, High Energy Physics - Phenomenology (hep-ph), velocity: dispersion, Astrophysics of Galaxies (astro-ph.GA), gravitation: acceleration, [PHYS.GRQC]Physics [physics]/General Relativity and Quantum Cosmology [gr-qc], history, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], cosmology, Astrophysics::Galaxy Astrophysics, orbit
Abstract

We have found that the high velocity dispersions of dwarf spheroidal galaxies (dSphs) can be well explained by Milky Way (MW) tidal shocks, which reproduce precisely the gravitational acceleration previously attributed to dark matter (DM). Here we summarize the main results of Hammer et al. (2019) who studied the main scaling relations of dSphs and show how dark-matter free galaxies in departure from equilibrium reproduce them well, while they appear to be challenging for the DM model. These results are consistent with our most recent knowledge about dSph past histories, including their orbits, their past star formation history and their progenitors, which are likely tiny dwarf irregular galaxies., 4 pages, 2 Figs., in the Conference of the French Society of Astronomy and Astrophysics (SF2A 2019, Nice); for more informations (and for an accompanying video) see the final (ApJ accepted) version of Hammer et al. 2019 (arXiv:1812.10714), which main results are summarized here, v2: it includes a small correction in Figure 1 (about Sofue, 2015 rotation curve)

Published
2019

4. Status of the GBAR experiment at CERN

Author

Bruno Mansoulie, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, and GBAR

Subjects
Nuclear and High Energy Physics, Gravity (chemistry), CERN Lab, Gravity, Ring (chemistry), 01 natural sciences, Nuclear physics, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], anti-p: storage ring, Physics::Atomic Physics, Physical and Theoretical Chemistry, 010306 general physics, Antihydrogen, antihydrogen: ion, Physics, Large Hadron Collider, 010308 nuclear & particles physics, atom, anti-p: energy: low, Anti-hydrogen, Condensed Matter Physics, Atomic and Molecular Physics, and Optics, Antiproton, gravitation: acceleration, Physics::Accelerator Physics, proposed experiment
Abstract

International audience; The GBAR experiment aims at measuring the free-fall of antihydrogen atoms. It is located at CERN in the AD area and will be connected to the new ELENA low-energy antiproton ring. Installation of the first components has started during the second half of 2017. The status and plans of the experiment will be given in this talk.

Published
2019
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5. Excursion set peaks in energy as a model for haloes

Author

Ravi K. Sheth and Marcello Musso

Subjects
moment: dipole, High Energy Physics - Theory, Cosmology and Nongalactic Astrophysics (astro-ph.CO), Field (physics), halo: formation, Boundary (topology), FOS: Physical sciences, dark matter: density, Astrophysics::Cosmology and Extragalactic Astrophysics, power spectrum, Gravitational acceleration, dark matter: halo, dipole [moment], Statistical physics, local [gravitation], Physics, formation [halo], density [dark matter], halo [dark matter], Astronomy and Astrophysics, Maxima and minima, Dark matter halo, collapse, High Energy Physics - Theory (hep-th), Space and Planetary Science, flow, gravitation: acceleration, Moment (physics), ddc:520, sphere, large-scale structure of Universe, Center of mass, Halo, gravitation: local, acceleration [gravitation], Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

Monthly notices of the Royal Astronomical Society 508(3), 3634 - 3648 (2021). doi:10.1093/mnras/stab2640, The simplest models of dark matter halo formation rely on the heuristic assumption, motivated by spherical collapse, that virialized haloes originate from initial regions that are maxima of the smoothed matter density field. Here, we replace this notion with the dynamical requirement that protohaloes be regions where the local gravitational flow converges to a point. For this purpose, we look for spheres whose acceleration at the boundary ��� relative to their centre of mass ��� points towards their geometric centre: that is, spheres with null dipole moment. We show that these configurations are minima of the energy, corresponding to the most energetically bound spheres. Therefore, we study peaks of the smoothed energy overdensity field. This significant conceptual change is technically trivial to implement: to change from density to energy one need only modify the standard top-hat smoothing filter. However, this comes with the important benefit that, for power spectra of cosmological interest, the model is no longer plagued by divergences: improving the physics mends the mathematics. In addition, the ���excursion set��� requirement that the smoothed matter density crosses a critical value can be naturally replaced by a threshold in energy. Measurements in simulations of haloes more massive than 10^13h^���1M_��� show very good agreement with a number of generic predictions of our model., Published by Oxford Univ. Press, Oxford

Published
2019
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6. Status of the GBAR experiment at CERN

Author

Latacz, Barbara, HEP, INSPIRE, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, and GBAR

Subjects
Physics - Instrumentation and Detectors, CERN Lab, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], hep-ex, FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), antihydrogen: acceleration, High Energy Physics - Experiment, positron: beam, High Energy Physics - Experiment (hep-ex), [PHYS.PHYS.PHYS-INS-DET] Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], gravitation: acceleration, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Physics::Accelerator Physics, High Energy Physics::Experiment, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], anti-p: storage ring, Physics::Atomic Physics, Detectors and Experimental Techniques, anti-p: beam, physics.ins-det, Particle Physics - Experiment, activity report, performance
Abstract

The GBAR experiment aims at measuring the free fall of antihydrogen atoms in the terrestrial gravitational field. It is located at CERN in the AD area. It is the first experiment which has been connected to the ELENA low energy antiproton ring that started commissioning in the summer of 2018. First tests with antiproton and positron beams were performed in summer and fall of 2018. The status and plans of the experiment are described in this document., Comment: contribution to the 2019 Gravitation session of the 54th Rencontres de Moriond

Published
2019
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7. Positron production using a 9 MeV electron linac for the GBAR experiment

Author

B. Radics, Alexei Voronin, L. Dodd, S. Niang, Bruno Mansoulie, Ferdinand Schmidt-Kaler, Valery Nesvizhevsky, P.-P. Crépin, Paul Indelicato, A. Husson, K.-H. Yoo, T. Kosinski, B. Latacz, A. Welker, Eun-San Kim, P. Debu, Laszlo Liszkay, André Rubbia, J. Rzadkiewicz, R. Nishi, Pierre Cladé, D. Lunney, G. Janka, Y. Sacquin, Paolo Crivelli, D. P. van der Werf, O. Rousselle, Jaison Lee, J.-M. Rey, D. Won, B.H. Kim, Paul-Antoine Hervieux, Naofumi Kuroda, S. Wolf, P. Lotrus, E. Lim, P. Pérez, Giuseppe Mornacchi, Jean-Philippe Karr, O. D. Dalkarov, M. Charlton, C. Regenfus, S. Guellati-Khélifa, S. Nourbaksh, Serge Reynaud, A. Douillet, Svante Jonsell, J.-M. Reymond, S. K. Kim, F. Nez, J.-Y. Roussé, M. Staszczak, K.H. Park, Giovanni Manfredi, Hyo-Suk Lee, JJ Choi, Young Ju Ko, M. Matusiak, N. Paul, Laurent Hilico, Moses Chung, S. Wronka, B. Tuchming, Yasunori Yamazaki, K. Lévêque, B. Vallage, T Louvradoux, P. Comini, A. M. M. Leite, S. Procureur, Laboratoire Kastler Brossel (LKB [Collège de France]), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Collège de France (CdF (institution)), 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), Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS), Université de Strasbourg (UNISTRA)-Matériaux et nanosciences d'Alsace (FMNGE), Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA), Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), 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), Institut Laue-Langevin (ILL), ILL, Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Collège de France (CdF (institution))-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)-Matériaux et Nanosciences Grand-Est (MNGE), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)

Subjects
safety, Antimatter, Nuclear and High Energy Physics, CERN Lab, Physics - Instrumentation and Detectors, tungsten, Positron, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Electron, 01 natural sciences, 7. Clean energy, Linear particle accelerator, positron: particle source, 010305 fluids & plasmas, electron: pair production, Nuclear physics, electron: linear accelerator, Linear accelerator, Antihydrogen, Gravitation, 0103 physical sciences, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Detectors and Experimental Techniques, Nuclear Experiment, 010306 general physics, physics.ins-det, Instrumentation, energy: low, antihydrogen, Physics, Large Hadron Collider, gravitation 2, Instrumentation and Detectors (physics.ins-det), linear accelerator, Antiproton Decelerator, Pair production, radioactivity, gravitation: acceleration, Physics::Accelerator Physics, High Energy Physics::Experiment, performance, positron: yield
Abstract

For the GBAR (Gravitational Behaviour of Antihydrogen at Rest) experiment at CERN's Antiproton Decelerator (AD) facility we have constructed a source of slow positrons, which uses a low-energy electron linear accelerator (linac). The driver linac produces electrons of 9 MeV kinetic energy that create positrons from bremsstrahlung-induced pair production. Staying below 10 MeV ensures no persistent radioactive activation in the target zone and that the radiation level outside the biological shield is safe for public access. An annealed tungsten-mesh assembly placed directly behind the target acts as a positron moderator. The system produces $5\times10^7$ slow positrons per second, a performance demonstrating that a low-energy electron linac is a superior choice over positron-emitting radioactive sources for high positron flux., published in NIM A. 33 pages 9 figures

Published
2021
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8. AEgIS at ELENA: outlook for physics with a pulsed cold antihydrogen beam

Author

Giovanni Consolati, F. Sorrentino, J. Marton, H. Holmestad, M. Fanì, A. Kellerbauer, F. Prelz, Heidi Sandaker, Ole Røhne, O. Khalidova, Daniel Comparat, Massimo Caccia, G. Nebbia, R. S. Brusa, C. Malbrunot, I. C. Tietje, Marco Prevedelli, N. Zurlo, P. Yzombard, D. Krasnický, P. Nedelec, Z. Mazzotta, V. Petracek, G. Testera, P. Lebrun, J. Fesel, Fabrizio Castelli, L. Di Noto, Johann Zmeskal, G. Bonomi, E. Widmann, Rafael Ferragut, Claude Amsler, D. Pagano, S. Haider, V. Lagomarsino, A. Gligorova, S.R. Müller, Marco Giammarchi, S. Aghion, J. Robert, Romualdo Santoro, S. Mariazzi, Nicola Pacifico, Luca Penasa, A. Demetrio, C. Zimmer, C. Evans, Giovanni Cerchiari, Ruggero Caravita, P. Lansonneur, Markus K. Oberthaler, B. Rienaecker, A. Hinterberger, L. Smestad, A. Fontana, M. Doser, Sebastian Gerber, V. N. Matveev, F. Guatieri, A. Rotondi, Doser, M., Aghion, S., Amsler, C., Bonomi, G., Brusa, R.S., Caccia, M., Caravita, R., Castelli, F., Cerchiari, G., Comparat, D., Consolati, G., Demetrio, A., Di Noto, L., Evans, C., Fanì, M., Ferragut, R., Fesel, J., Fontana, A., Gerber, S., Giammarchi, M., Gligorova, A., Guatieri, F., Haider, S., Hinterberger, A., Holmestad, H., Kellerbauer, A., Khalidova, O., Krasnický, D., Lagomarsino, V., Lansonneur, P., Lebrun, P., Malbrunot, C., Mariazzi, S., Marton, J., Matveev, V., Mazzotta, Z., Müller, S.R., Nebbia, G., Nedelec, P., Oberthaler, M., Pacifico, N., Pagano, D., Penasa, L., Petracek, V., Prelz, F., Prevedelli, M., Rienaecker, B., Robert, J., Røhne, O.M., Rotondi, A., Sandaker, H., Santoro, R., Smestad, L., Sorrentino, F., Testera, G., Tietje, I.C., Widmann, E., Yzombard, P., Zimmer, C., Zmeskal, J., Zurlo, N., 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), 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), and Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
General Physics and Astronomy, Antiproton, magnetic field, Positronium, 01 natural sciences, 010305 fluids & plasmas, antihydrogen: formation, antimatter, Physics::Atomic Physics, Physics, antihydrogen, antiprotons, positrons, positronium, Large Hadron Collider, atom, General Engineering, Articles, antihydrogen, antiprotons, positronium, positrons, charge exchange, pulsed, anti-p, Antimatter, force: gravitation, gravitation: acceleration, Rydberg formula, symbols, Physics::General Physics, CERN Lab, General Mathematics, interferometer, Positron, antihydrogen: beam, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear physics, symbols.namesake, 0103 physical sciences, Physics::Atomic and Molecular Clusters, positronium: excited state, 010306 general physics, Antihydrogen, detector: position sensitive, gravitation: interaction, antihydrogen: production, ground state: hyperfine structure, Antiproton Decelerator, Automatic Keywords, Beam (structure)
Abstract

The efficient production of cold antihydrogen atoms in particle traps at CERN’s Antiproton Decelerator has opened up the possibility of performing direct measurements of the Earth’s gravitational acceleration on purely antimatter bodies. The goal of the AEgIS collaboration is to measure the value of g for antimatter using a pulsed source of cold antihydrogen and a Moiré deflectometer/Talbot–Lau interferometer. The same antihydrogen beam is also very well suited to measuring precisely the ground-state hyperfine splitting of the anti-atom. The antihydrogen formation mechanism chosen by AEgIS is resonant charge exchange between cold antiprotons and Rydberg positronium. A series of technical developments regarding positrons and positronium (Ps formation in a dedicated room-temperature target, spectroscopy of the n =1–3 and n =3–15 transitions in Ps, Ps formation in a target at 10 K inside the 1 T magnetic field of the experiment) as well as antiprotons (high-efficiency trapping of , radial compression to sub-millimetre radii of mixed plasmas in 1 T field, high-efficiency transfer of to the antihydrogen production trap using an in-flight launch and recapture procedure) were successfully implemented. Two further critical steps that are germane mainly to charge exchange formation of antihydrogen—cooling of antiprotons and formation of a beam of antihydrogen—are being addressed in parallel. The coming of ELENA will allow, in the very near future, the number of trappable antiprotons to be increased by more than a factor of 50. For the antihydrogen production scheme chosen by AEgIS, this will be reflected in a corresponding increase of produced antihydrogen atoms, leading to a significant reduction of measurement times and providing a path towards high-precision measurements. This article is part of the Theo Murphy meeting issue ‘Antiproton physics in the ELENA era’.

Published
2018
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9. Towards the first measurement of matter-antimatter gravitational interaction

Author

Giovanni Consolati, Heidi Sandaker, A. Kellerbauer, D. Krasnický, S. Haider, L. Di Noto, Z. Mazzotta, P. Lebrun, Giovanni Cerchiari, Daniel Comparat, Markus K. Oberthaler, Massimo Caccia, P. Nedelec, E. Widmann, Rafael Ferragut, G. Testera, G. Bonomi, B. Rienaecker, A. Fontana, C. Malbrunot, L. Ravelli, I. C. Tietje, V. Lagomarsino, Fabrizio Castelli, C. Zimmer, G. Nebbia, F. Sorrentino, Sebastian Gerber, S.R. Müller, O. Khalidova, Luca Penasa, Ruggero Caravita, V. N. Matveev, M. Doser, S. Aghion, Marco Prevedelli, F. Guatieri, R. S. Brusa, Claude Amsler, Marco Giammarchi, A. Hinterberger, Romualdo Santoro, S. Mariazzi, A. Demetrio, C. Evans, J. Fesel, P. Lansonneur, F. Prelz, M. Fanì, L. Smestad, J. Robert, A. Rotondi, A. Gligorova, H. Holmestad, N. Zurlo, P. Yzombard, Nicola Pacifico, J. Marton, Ole Røhne, V. Petracek, Johann Zmeskal, D. Pagano, 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), 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), and Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Physics::General Physics, experimental methods, geometry, CERN Lab, electric field: gradient, QC1-999, deflection, 02 engineering and technology, Gravitational acceleration, 7. Clean energy, 01 natural sciences, antihydrogen: acceleration, Nuclear physics, Gravitation, Physics and Astronomy (all), Gravitational field, 0103 physical sciences, Physics::Atomic and Molecular Clusters, antimatter, Physics::Atomic Physics, Equivalence principle, positronium: excited state, 010306 general physics, Antihydrogen, Physics, General Relativity and Cosmology, detector: position sensitive, atom, gravitation: interaction, 021001 nanoscience & nanotechnology, charge exchange, anti-p, experimental equipment, Deflection (physics), equivalence principle, Antiproton, Antimatter, gravitation: acceleration, [PHYS.GRQC]Physics [physics]/General Relativity and Quantum Cosmology [gr-qc], 0210 nano-technology, experimental results
Abstract

International audience; The AEgIS (Antimatter Experiment: Gravity, Interferometry, Spectroscopy) is a CERN based experiment with the central aim to measure directly the gravitational acceleration of antihydrogen. Antihydrogen atoms will be produced via charge exchange reactions which will consist of Rydberg-excited positronium atoms sent to cooled antiprotons within an electromagnetic trap. The resulting Rydberg antihydrogen atoms will then be horizontally accelerated by an electric field gradient (Stark effect), they will then pass through a moiré deflectometer. The vertical deflection caused by the Earth's gravitational field will test for the first time the Weak Equivalence Principle for antimatter. Detection will be undertaken via a position sensitive detector. Around $10^3$ antihydrogen atoms are needed for the gravitational measurement to be completed. The present status, current achievements and results will be presented, with special attention toward the laser excitation of positronium (Ps) to the $n=3$ state and the production of Ps atoms in the transmission geometry.

Published
2017
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10. Radial acceleration relation and dissipative dark matter

Author

Z. K. Silagadze, Olga Chashchina, Robert Foot, École polytechnique (X), and École polytechnique ( X )

Subjects
[ PHYS.ASTR ] Physics [physics]/Astrophysics [astro-ph], Scalar field dark matter, FOS: Physical sciences, dark matter: mirror, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, dark matter: density, 01 natural sciences, High Energy Physics - Phenomenology (hep-ph), Baryonic dark matter, 0103 physical sciences, Warm dark matter, 010303 astronomy & astrophysics, Light dark matter, Physics, 010308 nuclear & particles physics, Hot dark matter, Astrophysics - Astrophysics of Galaxies, Dark matter halo, baryon, High Energy Physics - Phenomenology, dark matter: dissipation, Astrophysics of Galaxies (astro-ph.GA), correlation, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], Mixed dark matter, gravitation: acceleration, [ PHYS.HPHE ] Physics [physics]/High Energy Physics - Phenomenology [hep-ph], galaxy, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Dark fluid
Abstract

Observations indicate that ordinary matter, the baryons, influence the structural properties of dark matter on galactic scales. One such indication is the radial acceleration relation, which is a tight correlation between the measured gravitational acceleration and that expected from the baryons. We show here that the dark matter density profile that has been motivated by dissipative dark matter models, including mirror dark matter, can reproduce this radial acceleration relation., Comment: About 8 pages; Matches published version

Published
2017
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11. Positronium for Antihydrogen Production in the AEGIS Experiment

Author

Heidi Sandaker, G. Nebbia, Eberhard Widmann, V. Lagomarsino, Sebastian Gerber, Z. Mazzotta, S.R. Müller, Markus K. Oberthaler, Romualdo Santoro, M. Fanì, F. Guatieri, B. Rienaecker, Alban Kellerbauer, P. Yzombard, Alberto Rotondi, Sebastiano Mariazzi, L. Di Noto, A. Hinterberger, Ole Røhne, A. Demetrio, Claude Amsler, Daniel Comparat, Giovanni Consolati, C. Evans, L. Smestad, Germano Bonomi, Massimo Caccia, Johann Marton, Nicola Zurlo, Rafael Ferragut, Andrea Fontana, V. Petráček, Nicola Pacifico, C. Malbrunot, Ruggero Caravita, O. Khalidova, D. Krasnicky, Felice Sorrentino, V. A. Matveev, Marco Giammarchi, P. Lansonneur, F. Prelz, Stefano Aghion, R. S. Brusa, J. Fesel, Patrick Nedelec, Johann Zmeskal, Giovanni Cerchiari, Luca Penasa, Marco Prevedelli, H. Holmestad, I. C. Tietje, S. Haider, G. Testera, Fabrizio Castelli, Michael Doser, Angela Gligorova, P. Lebrun, J. Robert, L. Ravelli, Davide Pagano, C. Zimmer, 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), 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), Consolati, G., Aghion, S., Amsler, C., Bonomi, G., Brusa, R. S., Caccia, M., Caravita, R., Castelli, F., Cerchiari, G., Comparat, D., Demetrio, A., Di Noto, L., Doser, M., Evans, C., Fanì, M., Ferragut, R., Fesel, J., Fontana, A., Gerber, S., Giammarchi, M., Gligorova, A., Guatieri, F., Haider, S., Hinterberger, A., Holmestad, H., Kellerbauer, A., Khalidova, O., Krasnicky, D., Lagomarsino, V., Lansonneur, P., Lebrun, P., Malbrunot, C., Mariazzi, S., Marton, J., Matveev, V., Mazzotta, Z., Müller, S. R., Nebbia, G., Nedelec, P., Oberthaler, M., Pacifico, N., Pagano, D., Penasa, L., Petracek, V., Prelz, F., Prevedelli, M., Ravelli, L., Rienaecker, B., Robert, J., Røhne, O. M., Rotondi, A., Sandaker, H., Santoro, R., Smestad, L., Sorrentino, F., Testera, G., Tietje, I. C., Widmann, E., Yzombard, P., Zimmer, C., Zmeskal, J., and Zurlo, N.

Subjects
Physics::General Physics, experimental methods, CERN Lab, talk: Lublin 2017/08/28, General Physics and Astronomy, anti-p: acceleration, Gravitational acceleration, 7. Clean energy, 01 natural sciences, anti-p p: annihilation, Nuclear physics, symbols.namesake, Physics and Astronomy (all), 0103 physical sciences, antimatter, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Physics::Atomic Physics, positronium: excited state, anti-p: beam, 010306 general physics, Antihydrogen, Physics, 010308 nuclear & particles physics, antihydrogen: production, Antiproton Decelerator, positronium: target, Antiproton, Antimatter, Excited state, gravitation: acceleration, Rydberg formula, symbols, proposed experiment, Rydberg state, gravity, antimatter, Particle Physics - Experiment
Abstract

International audience; The primary goal of the Antihydrogen Experiment: Gravity, Interferometry, Spectroscopy (AEGIS) collaboration is to measure for the first time precisely the gravitational acceleration of antihydrogen, H¯ , a fundamental issue of contemporary physics, using a beam of antiatoms. Indeed, although indirect arguments have been raised against a different acceleration of antimatter with respect to matter, nevertheless some attempts to formulate quantum theories of gravity, or to unify gravity with the other forces, consider the possibility of a non-identical gravitational interaction between matter and antimatter. We plan to generate H¯ through a charge-exchange reaction between excited Ps and antiprotons coming from the Antiproton Decelerator facility at CERN. It offers the advantage to produce sufficiently cold antihydrogen to make feasible a measurement of gravitational acceleration with reasonable uncertainty (of the order of a few percent). Since the cross-section of the above reaction increases with n 4 , n being the principal quantum number of Ps, it is essential to generate Ps in a highly excited (Rydberg) state. This will occur by means of two laser excitations of Ps emitted from a nanoporous silica target: a first UV laser (at 205 nm) will bring Ps from the ground to the n = 3 state; a second laser pulse (tunable in the range 1650–1700 nm) will further excite Ps to the Rydberg state.

Published
2017
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12. Enhanced anti-hydrogen ion production

Author

Cooke, D. A., Husson, A., Lunney, D., Crivelli, P., Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), and 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)

Subjects
CERN Lab, Atomic Physics (physics.atom-ph), ion: production, measurement methods, Other Fields of Physics, FOS: Physical sciences, physics.atom-ph, High Energy Physics - Experiment, Physics - Atomic Physics, High Energy Physics - Experiment (hep-ex), [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], overlap, Physics::Atomic Physics, capture, antihydrogen: ion, density, hep-ex, antihydrogen: production, atom, talk: London 2015/08/04, charge exchange, [PHYS.PHYS.PHYS-GEN-PH]Physics [physics]/Physics [physics]/General Physics [physics.gen-ph], anti-p, positronium: target, gravitation: acceleration, positron, Physics::Accelerator Physics, debunching, bunching, Particle Physics - Experiment, experimental results
Abstract

The production of anti-hydrogen ions in the GBAR experiment will occur via a two step charge exchange process. In a first reaction, the anti-protons from the ELENA ring at CERN will capture a positron from a positronium target producing anti-hydrogen atoms. Those interacting in the same positronium target will produce in a second step anti-hydrogen ions. This results in a dependence for the anti-ions production rate which is roughly proportional to the positronium density squared. We present a scheme to increase the anti-ions production rate in the GBAR experiment by tailoring the anti-proton to the positron pulse in order to maximise the temporal overlap of Ps and anti-protons. Detailed simulations show that an order of magnitude could be gained by bunching the anti-protons from ELENA. In order to avoid losses in their capture in the Paul trap due to the energy spread introduced by the bunching, debunching with a symmetrical inverted pulse can be applied to the anti-hydrogen ions., 8 pages, 6 figures, prepared for the proceedings of the WAG2015 conference

Published
2016

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