HL-1M装置边缘等离子体结构研究

Research of edge plasma structure on the HL-1M tokamak

描述HL 1M装置上几种典型放电中的边缘等离子体物理实验结果 .利用马赫 朗缪尔 6探针组、静电 4探针组、2 0组三探针阵列研究了低杂波电流驱动、超声分子束注入、多发弹丸注入和中性束注入放电中的粒子约束性能、等离子体旋转和边缘静电雷诺胁强的变化对改善约束的影响 .给出了雷诺胁强和极向相速度的关系 .结果表明 ,雷诺胁强的径向变化可以自发产生托卡马克等离子体的剪切极向流 .LHCD能使低密度放电的粒子约束增加 1至 2倍 .弹丸注入后 ,粒子约束时间和极向旋转至少可增加 1倍 。

In this paper, experimental results of plasma characteristics in several discharges have been measured in the plasma boundary region of the HL-1M tokamak using a multiarray of Mach/Langmuir 6 probes, electrostatic 4 probes and 20 group of 3 probes. In the experiments of Ohmic discharge, lower hybrid current drive, supersonic molecular beam injection, multi-shot pellet injection and neutral beam injection, etc., the correlation between the Reynolds stress and poloidal flow in the edge plasma is obtaimed. The experimental results suggest that the confinement improvement is related to the increasing rotation velocity and to the decreasing edge fluctuation. The results indicate that the sheared poloidal flow can be generated in tokamak plasma due to the radially varying Reynolds stress. The particle confinement with low-density discharge can increase 1-2 times in LHCD. The particle confinement time and poloidal rotation velocity can at least be doubled after MPI, and that the particle confinement time can increase one order of magnitude and can obtain high performance plasma during the experiment of SMBI.