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采用低温冷凝泵来实现束生成与传输所需的真空环境是兆瓦级中性束注入器研制中的合理选择。低温冷凝泵由防辐射挡板和低温冷凝板两部分组成。防辐射挡板的传输几率是影响主低温冷凝泵性能的重要参数。通过蒙特卡洛法模拟气体分子运动过程,分析计算了主低温冷凝泵防辐射挡板的传输几率,以及主低温冷凝泵的抽速,为防辐射挡板的优化设计提供了理论指导。
The vacuum environment required for cryogenic condensate pumps to generate and deliver beams is a reasonable option in the development of megawatt neutral beam injectors. Cryogenic condensate pump consists of radiation baffle and cryogenic condensation plate of two parts. Radiation baffle transmission probability is an important parameter affecting the performance of the main cryogenic condensate pump. Monte Carlo method was used to simulate the molecular motion of gas, and the transmission probability of the radiation shield of the main cryogenic condensate pump and the pumping speed of the main cryogenic condensate pump were analyzed and calculated, which provided theoretical guidance for the optimal design of the radiation shield.