Positron production using a 9 MeV electron linac for the GBAR experiment
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 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.
Keywords
Cite
@article{arxiv.2006.05966,
title = {Positron production using a 9 MeV electron linac for the GBAR experiment},
author = {M. Charlton and J. J. Choi and M. Chung and P. Clade and P. Comini and P-P. Crepin and P. Crivelli and O. Dalkarov and P. Debu and L. Dodd and A. Douillet and S. Guellati-Khelifa and P-A. Hervieux and L. Hilico and A. Husson and P. Indelicato and G. Janka and S. Jonsell and J-P. Karr and B. H. Kim and E-S. Kim and S. K. Kim and Y. Ko and T. Kosinski and N. Kuroda and B. Latacz and H. Lee and J. Lee and A. M. M. Leite and K. Leveque and E. Lim and L. Liszkay and P. Lotrus and T. Louvradoux and D. Lunney and G. Manfredi and B. Mansoulie and M. Matusiak and G. Mornacchi and V. V. Nesvizhevsky and F. Nez and S. Niang and R. Nishi and S. Nourbaksh and K. H. Park and N. Paul and P. Perez and S. Procureur and B. Radics and C. Regenfus and J-M. Rey and J-M. Reymond and S. Reynaud and J-Y. Rousse and O. Rousselle and A. Rubbia and J. Rzadkiewicz and Y. Sacquin and F. Schmidt-Kaler and M. Staszczak and B. Tuchming and B. Vallage and A. Voronin and A. Welker and D. P. van der Werf and S. Wolf and D. Won and S. Wronka and Y. Yamazaki and K-H. Yoo},
journal= {arXiv preprint arXiv:2006.05966},
year = {2020}
}
Comments
published in NIM A. 33 pages 9 figures