基于MC的差分式低温泵人字形挡板结构分析  

Structural analyzing for the chevron radiation baffle of the differential cryopump by the Monte Carlo method

作　　者：崔伟[1] 胡纯栋[1] 谢远来[1] 

机构地区：[1]中国科学院等离子体物理研究所,合肥230031

出　　处：《低温与超导》2013年第4期9-12,共4页Cryogenics and Superconductivity

摘　　要：差分式低温冷凝泵主要用来维持EAST-NBI内的真空环境,以满足中性束生成与传输过程对真空压力分布的要求。人字形辐射挡板吸收高温壁面的辐射热,冷却到达低温冷凝板的气体。传输几率是影响人字形辐射挡板的一个重要的参数。为了寻求最佳的人字形辐射挡板的结构参数,文中主要利用蒙特卡罗方法,模拟气体分子的运动过程,计算不同参数下人字形辐射挡板的传输几率。根据中性束注入装置的尺寸要求,确定了人字形辐射挡板的具体尺寸。这为进一步优化人字形辐射挡板提供了理论基础。The differential cryopump of EAST - NBI can ensure the vacuum for fulfilling the requirements of pressure distribution about generation and transmission of neutral beam. The chevron radiation baffle can absorb the radiation heat load from the high temperature face and cool the gas in front of the cryopanel. The molecular transmission coefficient is an important parameter about the chevron radiation baffle. To find the optimal structural parameters of the chevron radiation baffle, we used the Monte Carlo method, simulated the movement process of the gas molecular and calculated the molecular transmission coefficient by the different parameters of the chevron radiation baffle in this article. We based on the requirement of the geometry dimension by NBI and made sure of the specific size of the chevron radiation baffle. This result can offer the theoretical elements for optimizing the chevron radiation baffle.

关 键 词：差分式低温冷凝泵 人字形辐射挡板 蒙特卡罗方法 传输几率 

分 类 号：TB655[一般工业技术—制冷工程]