EAST装置等离子体放电真空室抽气系统抽速标定及应用  

Pumping Speed Calibration of Inner Vacuum Pumping System and Application on EAST

作　　者：黄明 元京升 左桂忠 曹斌 余耀伟 庄会东[2] 陈跃 王勇[1] 徐宏亮[1] 胡建生[2] HUANG Ming;YUAN Jingsheng;ZUO Guizhong;CAO Bin;YU Yaowei;ZHUANG Huidong;CHEN Yue;WANG Yong;XU Hongliang;HU Jiansheng(University of Science and Technology of China,Hefei 230026,China;Institute of Plasma Physics,Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei 230031,China)

机构地区：[1]中国科学技术大学,合肥230026 [2]中国科学院合肥物质科学研究院等离子体物理研究所,合肥230031

出　　处：《真空与低温》2024年第3期248-254,共7页Vacuum and Cryogenics

基　　金：国家重点研发计划项目(2022YFE03130000、2022YFE03100003);国家自然科学基金(12105322、12105135)。

摘　　要：真空系统是聚变装置的重要组成部分,EAST真空系统包括等离子体放电真空室和低温超导真空室。等离子体放电真空室又称内真空室。内真空室抽气系统直接影响装置的粒子排出,关系到高参数等离子体放电获得。EAST装置升级改造后的内真空室抽气系统主要包括主抽管道抽气子系统、偏滤器抽气子系统和低杂波加热系统抽气子系统,整个抽气系统使用了6台分子泵、14台外置低温泵和2套内置低温泵。采用粒子平衡的方法,对内真空室抽气系统各子系统进行了抽速标定。实验结果表明,最佳抽气性能区间在5×10^(-4)~5×10^(-3)Pa,并且随着真空室压力增大或者减小,各子系统的抽气速率均下降。对比改进前后的内真空室抽气系统的总抽速,改进后的最大抽速可达170 m^(3)/s,总体抽气速率提升20%左右。在百秒量级等离子放电参数下,利用标定的抽气速率数据初步评估了燃料粒子的滞留情况。本研究为等离子体放电的壁滞留与再循环控制以及其他相关物理实验开展提供了数据支持。Vacuum system is an important part of the fusion device,and vacuum system of EAST mainly includes cryogenic superconducting vacuum vessel and plasma discharge vacuum vessel.The plasma discharge vacuum vessel is also known as the inner vacuum vessel and the inner vacuum pumping system directly affects the removal of particles from the device and the achievements of high-parameter plasma discharges.The improved inner vacuum pumping system of EAST mainly includes main pumping subsystem,divertor pumping subsystem and lower hybrid wave heating system pumping subsystem.There are 6 molecular pumps,14 outer cryopumps and 2 inner cryopumps used for the whole pumping system.The gas balance method was used to calibrate the pumping speed of each subsystem.The experimental results showed that the pumping speed is the highest at the pressure ranging from 5×10^(-4) to 5×10^(-3) Pa in the inner vacuum vessel,and the pumping speed of each subsystem decreases with the increase or decrease of the vacuum vessel pressure.Compared with the total pumping speed before and after the improvement,the maximum pumping speed after the improvement can reach 170 m^(3)/s,and the overall pumping speed can be increased by about 20%.Under the hundred-second plasma discharge parameters,the retention of fueling particles is preliminarily evaluated by calibrated pumping speed.This study provides data support for wall retention and recycling control of plasma discharge and other related physical experiments.

关 键 词：真空抽气系统 抽气速率标定 燃料粒子滞留 EAST 

分 类 号：TB77[一般工业技术—真空技术]