Abstract:

In the HL-2A divertor experiments, the profiles of the electron temperature, density and floating potential on divertor plates are measured with the flush probe arrays fixed on the four divertor neutralization plates at the same toroidal cross-section in the HL-2A tokamak. The edge electron temperature during divertor configuration is higher than that during limiter one. Temperature asymmetry between the outer target plate and the inner one is compared. The result of magnetic surface reconstructed from signals of the 18 Mirnov coils is presented. Neutral gas pressure in the divertor chamber measured with fast ionization gauge during divertor discharge is given. The divertor experiment results indicate that the recycle of edge particles is reduced and the level of impurity flux is decreased in the main vacuum chamber.

Key words: Divertor running model, Neutralizer target plates, Flush plane probe array

摘要：

在HL-2A装置的偏滤器位形运行模式下,用偏滤器靶板上的平面型嵌入式静电探针阵列测量了同一环截面的内外和上下四个中性化板上的电子温度、密度、悬浮电位分布。偏滤器运行模式下的边缘电子温度高于孔栏运行模式下的边缘的电子温度。比较了内外靶板之间的温度不对称性。给出了由18个米尔诺夫线圈信号重建获得的磁分界面,并用强磁场快速电离规测量了偏滤器室的中性气体压强变化。测量结果表明,在偏滤器运行模式下,主真空室中边缘粒子再循环降低,杂质通量水平下降。

关键词: 偏滤器运行模式, 中性化靶板, 嵌入式平面探针组