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20 April 2024

» arxiv » 2006.5966

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Positron production using a 9 MeV electron linac for the GBAR experiment
M. Charlton ; J. J. Choi ; M. Chung ; P. Clade ; P. Comini ; P-P. Crepin ; P. Crivelli ; O. Dalkarov ; P. Debu ; L. Dodd ; A. Douillet ; S. Guellati-Khelifa ; P-A. Hervieux ; L. Hilico ; A. Husson ; P. Indelicato ; G. Janka ; S. Jonsell ; J-P. Karr ; B. H. Kim ; E-S. Kim ; S. K. Kim ; Y. Ko ; T. Kosinski ; N. Kuroda ; B. Latacz ; H. Lee ; J. Lee ; A. M. M. Leite ; K. Leveque ; E. Lim ; L. Liszkay ; P. Lotrus ; T. Louvradoux ; D. Lunney ; G. Manfredi ; B. Mansoulie ; M. Matusiak ; G. Mornacchi ; V. V. Nesvizhevsky ; F. Nez ; S. Niang ; R. Nishi ; S. Nourbaksh ; K. H. Park ; N. Paul ; P. Perez ; S. Procureur ; B. Radics ; C. Regenfus ; J-M. Rey ; J-M. Reymond ; S. Reynaud ; J-Y. Rousse ; O. Rousselle ; A. Rubbia ; J. Rzadkiewicz ; Y. Sacquin ; F. Schmidt-Kaler ; M. Staszczak ; B. Tuchming ; B. Vallage ; A. Voronin ; A. Welker ; D. P. van der Werf ; S. Wolf ; D. Won ; S. Wronka ; Y. Yamazaki ; K-H. Yoo ;
Date:	10 Jun 2020
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 $5 imes10^{7}$ 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.
Source:	arXiv, 2006.5966
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