CERN Accelerating science

Article
Report number	arXiv:2006.05966
Title	Positron production using a 9 MeV electron linac for the GBAR experiment
Author(s)	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.) ; Douillet, A. (Paris, Lab. Kastler Brossel ; Saclay) ; Guellati-Khélifa, S. (Paris, Lab. Kastler Brossel) ; Hervieux, P.A. (IPCMS, Strasbourg) ; Hilico, L. (Paris, Lab. Kastler Brossel) ; Husson, A. (CSNSM, Orsay) ; Indelicato, P. (Paris, Lab. Kastler Brossel) ; Janka, G. (Zurich, ETH) ; Jonsell, S. (Stockholm U.) ; Karr, J-P (Paris, Lab. Kastler Brossel) ; Kim, B.H. (Seoul Natl. U., Dept. Phys. Astron.) ; Kim, E-S. ; Kim, S.K. ; Ko, Y. (Seoul Natl. U., Dept. Phys. Astron. ; IBS, Daejeon, CUP) ; Kosinski, T. (NCBJ, Swierk) ; Kuroda, N. (Tokyo U., Komaba) ; Latacz, B. (IRFU, Saclay ; Wako, RIKEN) ; Lee, H. (Seoul Natl. U., Dept. Phys. Astron.) ; Lee, J. (IBS, Daejeon, CUP) ; Leite, A.M.M. (IRFU, Saclay) ; Lévêque, K. (IPCMS, Strasbourg) ; Lim, E. ; Liszkay, L. (IRFU, Saclay) ; Lotrus, P. (IRFU, Saclay) ; Louvradoux, T. (Paris, Lab. Kastler Brossel) ; Lunney, D. (CSNSM, Orsay) ; Manfredi, G. (IPCMS, Strasbourg) ; Mansoulié, B. (IRFU, Saclay) ; Matusiak, M. (NCBJ, Swierk) ; Mornacchi, G. (CERN) ; Nesvizhevsky, V.V. (Laue-Langevin Inst.) ; Nez, F. (Paris, Lab. Kastler Brossel) ; Niang, S. (IRFU, Saclay) ; Nishi, R. (Tokyo U., Komaba) ; Nourbaksh, S. (CERN) ; Park, K.H. (Seoul Natl. U., Dept. Phys. Astron.) ; Paul, N. (Paris, Lab. Kastler Brossel) ; Pérez, P. (IRFU, Saclay) ; Procureur, S. (IRFU, Saclay) ; Radics, B. (Zurich, ETH) ; Regenfus, C. (Zurich, ETH) ; Rey, J.M. (IRFU, Saclay) ; Reymond, J.M. (IRFU, Saclay) ; Reynaud, S. (Paris, Lab. Kastler Brossel) ; Roussé, J.Y. (IRFU, Saclay) ; Rousselle, O. (Paris, Lab. Kastler Brossel) ; Rubbia, A. (Zurich, ETH) ; Rzadkiewicz, J. (NCBJ, Swierk) ; Sacquin, Y. (IRFU, Saclay) ; Schmidt-Kaler, F. (Mainz U., Inst. Phys.) ; Staszczak, M. (NCBJ, Swierk) ; Tuchming, B. (IRFU, Saclay) ; Vallage, B. (IRFU, Saclay) ; Voronin, A. (Lebedev Inst.) ; Welker, A. (CERN) ; Van Der Werf, D.P. (Swansea U.) ; Wolf, S. (Mainz U., Inst. Phys.) ; Won, D. (Seoul Natl. U., Dept. Phys. Astron.) ; Wronka, S. (NCBJ, Swierk) ; Yamazaki, Y. (Wako, RIKEN) ; Yoo, K.H. (UNIST, Ulsan)
Publication	2021-01-01
Imprint	2020-06-10
Number of pages	33
Note	Submitted to Nucl.Instrum.Meth. Submitted to Nucl.Instrum.Meth. published in NIM A. 33 pages 9 figures
In:	Nucl. Instrum. Methods Phys. Res., A 985 (2021) 164657
DOI	10.1016/j.nima.2020.164657 (publication)
Subject category	physics.ins-det ; Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN AD ; GBAR AD-7
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.
Copyright/License	preprint: (Licenses: arXiv nonexclusive-distrib 1.0, CC BY-NC-SA 4.0) publication: © 2020-2024 Elsevier B.V.

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