HL-2A装置偏滤器的脱靶等离子体实验

在HL-2A装置偏滤器靶板上采用嵌入式静电三探针阵列和偏滤器室内的电动扫描四探针组测量了同一极向截面的内外中性化板上和偏滤器室内的电子温度、密度、悬浮电位、空间电位、电场、电子压强及其分布，研究了偏滤器中等离子体参数的分布及非对称性和脱靶等离子体运行模式下的等离子体行为，开展了偏滤器脱离靶板等离子体的实验研究。利用主真空室的快速往复扫描三台阶式六探针系统测量了主等离子体边缘和偏滤器室内的等离子体温度、密度、粒子通量和中性粒子密度等参数，研究了脱靶等离子体的形成过程、物理特性、控制方法，以及对主等离子体性能的影响。

Experiments of the divertor detached plasma in the HL-2A tokamak

The divertor plasma characteristics is studied by using the fixed flush probe arrays located on the 4 neutralization plates and the electromotive-scanning 4-probe system placed in the outer chamber at the same cross-section in the HL-2A tokamak. Some important information on plasma parameter distribution and its asymmetry, and the detached plasma properties has been obtained. The fast reciprocating probes are used to measure the edge plasma temperature, density, floating potential and corresponding fluctuation profiles. These results are very useful to investigate the divertor physics, and show that the radiation divertor discharge can improve the particle confinement.