中性束注入器低温真空空间气体温度分布模拟研究  

Simulation of Gas Temperature Distribution in Cryo-Vacuum Space for a Neutral Beam Injector

作　　者：胡纯栋[1] 郎嘉琪 谢远来 王铭翔 张照元 NBI团队 HU Chun-dong;LANG Jia-qi;XIE Yuan-lai;WANG Ming-xiang;ZHANG Zhao-yuan;NBI Team(Institute of Plasma Physics,Chinese Academy of Sciences,Heifei 230031,China;HeFei University of Technology,Hefei 230009,China;University of Science and Technology of China,Heifei 230026,China)

机构地区：[1]中国科学院等离子体物理研究所,安徽合肥230031 [2]合肥工业大学,安徽合肥230009 [3]中国科学技术大学,安徽合肥230026

出　　处：《真空》2020年第5期75-78,共4页Vacuum

基　　金：国家重点研发计划资助,项目编号:2017YFE300103(CEFTR-NBI束传输系统)。

摘　　要：中性束的生成与传输过程需要真空梯度分布环境,准确掌握真空室内的真空度及其分布对中性束的调试和运行有非常重要的意义。受低温真空空间不同区域的器壁温度影响,真空室内空间气体温度具有特定的分布特性,该特性对准确测量并最终确定其真空度有关键性影响。本文基于Molflow软件模拟分析了全超导托卡马克中性束注入器(EAST-NBI)真空室内的气体分子碰撞频度和气体分子数密度分布,获得了真空空间不同区域的气体温度分布,为根据温度分布修正特定真空测量点的测量结果提供了依据,提高了真空度的测量精度。The generation and transmission process of the neutral beam requires a vacuum gradient distribution environment. It is very important to accurately get the vacuum degree and its distribution in the vacuum chamber for the commission and operation of the neutral beam. Affected by the temperature of the wall in different areas of a cryo-vacuum space, the gas temperature in the vacuum chamber has a specific distribution characteristics, which has a critical impact on accurate measurement and final determination of the vacuum degree. Based on the Molflow software, the collision frequency and gas molecular density distribution of gas molecules in the vacuum chamber of the full superconducting tokamak neutral beam injector were simulated, and the gas temperature distribution in different regions of the vacuum space was obtained. It provides temperature basis for the amendment of specific vacuum measurement points, and improves the measurement accuracy of the vacuum degree.

关 键 词：中性束 真空梯度 Molflow软件 气体温度 

分 类 号：TL631.24[核科学技术—核技术及应用]