CFETR偏滤器低温泵抽气系统的设计和有效抽速的计算  

Design of CFETR divertor cryo-pump pumping system and calculation of effective pumping speed

作　　者：张西洋 许铁军 姚达毛 ZHANG Xi-yang;XU Tie-jun;YAO Da-mao(School of Artificial Intelligence,Anhui University of Technology,Huainan 232001;Institute of Plasma Physics,Chinese Academy of Sciences,Hefei 230031)

机构地区：[1]安徽理工大学人工智能学院,淮南232001 [2]中国科学院等离子体物理研究所,合肥230031

出　　处：《核聚变与等离子体物理》2024年第3期275-281,共7页Nuclear Fusion and Plasma Physics

基　　金：安徽理工大学高层次引进人才科研启动基金资助(2023yjrc109);中国聚变技术计划综合研究设施(2018-000052-73-01-001228)。

摘　　要：中国聚变工程实验堆(CFETR)提出了混合偏滤器-包层集成概念,偏滤器下方被增殖包层占据。偏滤器抽气通道设计在增殖包层内,满足有效抽气流量为250Pa·m^(3)·s^(-1)的工程设计要求。基于真空流导计算理论设计了偏滤器低温泵抽气系统,计算比较了不同截面形状下偏滤器低温泵抽气系统的流导和单台低温泵在偏滤器抽气通道入口的有效抽速。在增殖包层内设计正方形截面形状的抽气通道更为合理,可同时满足粒子排除要求和增殖包层强度要求。当正方形截面尺寸为350mm×350mm,偏滤器低温泵抽气系统流导为12.08m^(3)·s^(-1),单台低温泵在偏滤器抽气通道入口的有效抽速为9.905m^(3)·s^(-1)时,26台低温泵可满足粒子排除要求,假设一个下窗口设置2台低温泵,低温泵共占用13个下窗口。基于理论公式设计了偏滤器低温泵抽气系统和评估了偏滤器的粒子排除能力,为后续CFETR的偏滤器抽气通道优化和有效抽速评估提供了理论依据和参考。CFETR has put forward the concept of hybrid divertor-blanket.The lower part of the divertor is occupied by the breeding blanket.The divertor pumping channel is designed in the breeding blanket to meet the engineering design requirements that the effective extraction flow of the divertor is 250Pa·m^(3)·s^(-1).Based on the vacuum flow conductance calculation theory,the divertor cryo-pump pumping system is designed,and the flow conductance of the divertor cryo-pump pumping system and the effective pumping speed of a single cryo-pump at the inlet of the divertor pumping channel under different section shapes are calculated and compared.It is more reasonable to design a square section pumping channel in the breeding blanket,which can meet both the exclude impurities requirements and the strength requirements of the breeding blanket.When the square section size is 350mm×350mm,the flow conductance of the divertor cryo-pump pumping system is 12.08m^(3)·s^(-1),the effective pumping speed of a single cryo-pump at the inlet of the divertor pumping channel is 9.905m^(3)·s^(-1),26 cryo-pumps can meet the exclude impurities requirements,and if one lower window is equipped with 2 cryo-pumps,the cryo-pumps occupy altogether 13 lower windows.Based on the theoretical formula,the cryo-pump pumping system of the divertor is designed and the exclude impurities ability of the divertor is evaluated,which provides a theoretical basis and reference for the subsequent optimization of the divertor pumping channel and evaluation of the effective pumping speed of CFETR.

关 键 词：CFETR 偏滤器 流导 有效抽速 低温泵 

分 类 号：TB753[一般工业技术—真空技术]