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arXiv 2006.05966physics.ins-det
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GBAR实验用9 MeV电子直线加速器产生正电子

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… 展开作者

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

备注：
published in NIM A. 33 pages 9 figures
发表信息：
Nucl. Instrum. Methods Phys. Res. A 985, 164657 (2021)
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摘要：

为了在欧洲核子研究中心的反质子减速器（AD）设施中进行反氢静止引力行为（GBAR）实验，我们建造了一个慢正电子源，它使用低能电子直线加速器（直线加速器）。驱动器直线加速器产生9 MeV动能的电子，这些电子从韧致辐射诱导的对产生中产生正电子。保持在10 MeV以下可确保目标区没有持续的放射性激活，并确保生物防护罩外的辐射水平对公众安全。一个退火的钨网组件直接放置在靶的后面，作为正电子减速剂。该系统每秒产生$5\times10^7$慢正电子，这一性能表明，对于高正电子通量，低能电子直线加速器是比正电子发射放射源更好的选择。

英文摘要：

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.

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