CFETR辉光放电清洗的均匀性研究  

Uniformity of Glow Discharge Cleaning for CFETR Vacuum Chamber:A Simulation Study

作　　者：常君怡 杨庆喜 陈仕琳 宋云涛[1] Chang Junyi;Yang Qingxi;Chen Shilin;Song Yuntao(Institute of Plasma Physics,Hefei Institutes of Physical Science,Chinese Academy of Science,Hefei 230031,China;University of Science and Technology of China y Hefei 230026,China)

机构地区：[1]中国科学院合肥物质科学研究所,合肥230031 [2]中国科学技术大学,合肥230026

出　　处：《真空科学与技术学报》2020年第10期926-931,共6页Chinese Journal of Vacuum Science and Technology

基　　金：CFETR装置总体集成和工程设计(2017YFE0300503)。

摘　　要：为研究壁表面离子流分布均匀性,设计高效率中国聚变工程实验堆辉光放电清洗(GDC)装置,采用流体模型对氦气辉光放电清洗进行等效二维模拟。阳极区域存在较强的局部电离,使得靠近阳极的第一壁受到更强烈的离子轰击;增加阳极电流该区域离子流密度显著增加,而放电清洗的均匀性并无提高;适当降低放电气压放电不均匀性得到较大改善;内壁电流密度略大于外壁电流密度,而电极径向位置对内外壁电流密度分布影响甚微。分析了阳极电流与电极数目的合理取值,给出了合适的放电气压范围。The glow discharge cleaning(GDC) of vacuum chamber,for China Fusion Engineering Testing Reactor(CFETR) project,was mathematically modeled,theoretically analyzed and numerically simulated for design optimization of GDC setup.The influence of the discharge variables,including the He-pressure,current/position of anode and electrode-number,on the uniformity of ion-current density distribution was investigated.The simulated results included: first,an intense ionization occurs in the ionization zone closely above the anode,resulting in strong ion-sputtering of the wall nearby;second,as the single-electrode current increases,the ion-current density in the ionization zone significantly increases,bringing about a non-uniform ion-current density distribution;third,the electrode’s radial position little affects the ion-current density distributions on the inner and outer walls;and finally,a lower pressure significantly reduces the non-uniformity and produces a small ion-current difference between the two walls.

关 键 词：辉光放电清洗 中国聚变工程实验堆 气体放电模拟 离子流密度 

分 类 号：TL631.24[核科学技术—核技术及应用]