间隙绝缘电极辉光放电实验观察

Experiment observation for glow discharge with gap insulation electrode

实验研究了ITER H_(2)/He辉光放电壁处理(GDC)系统的电极合理的间隙绝缘参数及标定辉光过程中沉积在电极头部的热负载。进行了H2/He击穿电压特性试验,在ITER GDC预期的壁离子电流密度条件下研究了H_(2)/He辉光放电电压和试验电极上热负荷与压强的关系、试验电极启辉耐受特性、试验电极温度与热负荷的关系以及在不同区域辉光放电的气压特性。介绍了H2/He放电期间在电极及其附近区域的溅射和沉积的检测结果以及对间隙绝缘的影响。为ITER辉光放电壁处理系统的设计和运行提供参考。

In order to determine the gap sizes of electrode insulation for ITER glow discharge wall conditioning(GDC)and to assess the heat load deposited on the electrode head during the glow discharge,a series of tests were performed on the SWIP experimental platform.The breakdown voltage against H_(2)and He glow discharge was obtained.The glow discharge voltage and thermal load on the test electrode against pressure,the tolerance of the test electrode in glow initiations,the relationship between the test electrode temperature and heat load,and gas pressure of glow discharge in different regions were studied under the ITER wall ion current density.In addition,ion sputtering and deposition on the wall of vacuum chamber during discharges were introduced,and their effects on the gap insulation were preliminarily analyzed.These results can provide reference for design and operation of ITER glow discharge wall conditioning system.