使用9 MeV电子Linac进行GBAR实验的正电子生产

论文标题

使用9 MeV电子Linac进行GBAR实验的正电子生产

Positron production using a 9 MeV electron linac for the GBAR experiment

论文作者

Charlton, M., Choi, J. J., Chung, M., Clade, P., Comini, P., Crepin, P-P., Crivelli, P., Dalkarov, O., Debu, P., Dodd, L., Douillet, A., Guellati-Khelifa, S., Hervieux, P-A., Hilico, L., Husson, A., Indelicato, P., Janka, G., Jonsell, S., Karr, J-P., Kim, B. H., Kim, E-S., Kim, S. K., Ko, Y., Kosinski, T., Kuroda, N., Latacz, B., Lee, H., Lee, J., Leite, A. M. M., Leveque, K., Lim, E., Liszkay, L., Lotrus, P., Louvradoux, T., Lunney, D., Manfredi, G., Mansoulie, B., Matusiak, M., Mornacchi, G., Nesvizhevsky, V. V., Nez, F., Niang, S., Nishi, R., Nourbaksh, S., Park, K. H., Paul, N., Perez, P., Procureur, S., Radics, B., Regenfus, C., Rey, J-M., Reymond, J-M., Reynaud, S., Rousse, J-Y., Rousselle, O., Rubbia, A., Rzadkiewicz, J., Sacquin, Y., Schmidt-Kaler, F., Staszczak, M., Tuchming, B., Vallage, B., Voronin, A., Welker, A., van der Werf, D. P., Wolf, S., Won, D., Wronka, S., Yamazaki, Y., Yoo, K-H.

论文摘要

对于CERN的抗蛋白原减速器（AD）设施的GBAR（静止基因在休息时的重力行为），我们构建了慢速正电子的来源，该源使用低能电子线性加速器（Linac）。驱动器Linac生产的9 MeV动能的电子产生了来自Bremsstrahung诱导的配对生产的正电子。保持在10 MEV以下，确保目标区域内没有持续的放射性激活，并且在生物屏蔽层之外的辐射水平是安全的。直接放置在目标后面的退火钨网状组件充当正电子主持人。该系统每秒产生$ 5 \ times10^7 $缓慢的正电子，这表明低能量的Linac是高正电子通量的标准发射放射性源的优越选择。

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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