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Positron accumulation in the GBAR experiment
/ GBAR Collaboration
We present a description of the GBAR positron (e+) trapping apparatus, which consists of a three stage Buffer Gas Trap (BGT) followed by a High Field Penning Trap (HFT), and discuss its performance. The overall goal of the GBAR experiment is to measure the acceleration of the neutral antihydrogen (H) atom in the terrestrial gravitational field by neutralising a positive antihydrogen ion (H+), which has been cooled to a low temperature, and observing the subsequent H annihilation following free fall. [...]
arXiv:2205.04530.-
2022-07-25 - 28 p.
- Published in : Nucl. Instrum. Methods Phys. Res., A 1040 (2022) 167263
Fulltext: PDF;
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A pulsed high-voltage decelerator system to deliver low-energy antiprotons
/ Husson, A (IJCLab, Orsay) ; Kim, B H (Seoul Natl. U., Dept. Phys. Astron.) ; Welker, A (CERN) ; Charlton, M (Swansea U.) ; Choi, J J (Seoul Natl. U., Dept. Phys. Astron.) ; Chung, M (UNIST, Ulsan) ; Cladé, P (Paris, Lab. Kastler Brossel) ; Comini, P (IRFU, Saclay) ; Crépin, P -P (Paris, Lab. Kastler Brossel) ; Crivelli, P (Zurich, ETH-CSCS/SCSC) et al.
The GBAR (Gravitational Behavior of Antihydrogen at Rest) experiment at CERN requires efficient deceleration of 100 keV antiprotons provided by the new ELENA synchrotron ring to synthesize antihydrogen. This is accomplished using electrostatic deceleration optics and a drift tube that is designed to switch from -99 kV to ground when the antiproton bunch is inside – essentially a charged particle “elevator” – producing a 1 keV pulse. [...]
2021 - 7 p.
- Published in : Nucl. Instrum. Methods Phys. Res., A 1002 (2021) 165245
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3.
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Positron production using a 9 MeV electron linac for the GBAR experiment
/ Charlton, M. (Swansea U.) ; Choi, J.J. (Seoul Natl. U., Dept. Phys. Astron.) ; Chung, M. (UNIST, Ulsan) ; Cladé, P. (Paris, Lab. Kastler Brossel) ; Comini, P. (IRFU, Saclay) ; Crépin, P.P. (Paris, Lab. Kastler Brossel) ; Crivelli, P. (Zurich, ETH) ; Dalkarov, O. (Lebedev Inst.) ; Debu, P. (IRFU, Saclay) ; Dodd, L. (Swansea U.) et al.
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. [...]
arXiv:2006.05966.-
2021-01-01 - 33 p.
- Published in : Nucl. Instrum. Methods Phys. Res., A 985 (2021) 164657
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The CLAS12 Geant4 simulation
/ Ungaro, M (Jefferson Lab) ; Angelini, G (George Washington U.) ; Battaglieri, M (INFN, Genoa) ; Burkert, V D (Jefferson Lab) ; Carman, D S (Jefferson Lab) ; Chatagnon, P (Orsay, IAS) ; Contalbrigo, M (INFM, Ferrara) ; Defurne, M (IRFU, Saclay) ; De Vita, R (INFN, Genoa) ; Duran, B (Temple U.) et al.
The Geant4 Monte-Carlo (GEMC) package is used to simulate the passage of particles through the various CLAS12 detectors. The geometry is implemented through a database of Geant4 volumes created either through the GEMC native API, by the CLAS12 geometry service, or imported from the CAD engineering model. [...]
2020 - 20 p.
- Published in : Nucl. Instrum. Methods Phys. Res., A 959 (2020) 163422
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The ASACUSA Micromegas Tracker: A cylindrical, bulk Micromegas detector for antimatter research
/ Radics, B (RIKEN (main)) ; Nagata, Y (RIKEN (main)) ; Yamazaki, Y (RIKEN (main)) ; Ishikawa, S (Tokyo, U. Earth Sci. Astron.) ; Kuroda, N (Tokyo, U. Earth Sci. Astron.) ; Matsuda, Y (Tokyo, U. Earth Sci. Astron.) ; Anfreville, M (IRFU, Saclay) ; Aune, S (IRFU, Saclay) ; Boyer, M (IRFU, Saclay) ; Chateau, F (IRFU, Saclay) et al.
The ASACUSA Micromegas Tracker (AMT; ASACUSA: Atomic Spectroscopy and Collisions Using Slow Antiprotons) was designed to be able to reconstruct antiproton-nucleon annihilation vertices in three dimensions. The goal of this device is to study antihydrogen formation processes in the ASACUSA cusp trap, which was designed to synthesise a spin-polarised antihydrogen beam for precise tests of Charge, Parity, and Time (CPT) symmetry invariance. [...]
AIP, 2015 - 9 p.
- Published in : Rev. Sci. Instrum. 86 (2015) 083304
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Why do we flush gas in gaseous detectors?
/ Procureur, S (IRFU, Saclay) ; Attié, D (IRFU, Saclay) ; Bouteille, S (Unlisted, FR) ; Calvet, D (IRFU, Saclay) ; Coppolani, X (IRFU, Saclay) ; Gallois, B (IRFU, Saclay) ; Gomez, H (IRFU, Saclay) ; Kebbiri, M (IRFU, Saclay) ; Le Courric, E (IRFU, Saclay) ; Magnier, P (IRFU, Saclay) et al.
The effects and the origin of the gas degradation in a gaseous detector-based tracker are investigated. The study focused on the so-called T2K gas, which turned out to be highly sensitive to pollutants. [...]
2020 - 7 p.
- Published in : Nucl. Instrum. Methods Phys. Res., A 955 (2020) 163290
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IRFU server - Fulltext - Full text
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Origin and simulation of sparks in MPGD
/ Procureur, S (IRFU, SPhN, Saclay) ; Aune, S (IRFU, Saclay) ; Ball, J (IRFU, SPhN, Saclay) ; Charles, G (IRFU, SPhN, Saclay) ; Moreno, B (IRFU, SPhN, Saclay) ; Moutarde, H (IRFU, SPhN, Saclay) ; Sabatié, F (IRFU, SPhN, Saclay)
The development of Micro-Pattern Gaseous Detectors for high luminosity experiments requires a better understanding of the origin of the sparks in these detectors. Assuming a spark occurs whenever the electron number reaches the well known Raether limit, previous Geant4 simulations quantitatively reproduced the spark rate observed in Micromegas with high energy hadron beams. [...]
2012
- Published in : JINST 7 (2012) C06009
- Published in : , pp. C06009
IOP Open Access article: PDF;
In : 2nd International Conference on Micro Pattern Gaseous Detectors, Maiko, Kobe, Japan, 29 Aug - 1 Sep 2011, pp.C06009
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