EAST上基于端口密度测量的低杂波耦合研究

Wave-plasma coupling by measuring LH grill density in EAST

介绍了一套安装在EAST装置低杂波天线端121上方，用来测量端121附近电子密度的Langmuir三探针系统及其初步实验结果。此探针系统由探针、测量电路、数据采集以及数据处理四部分构成。实验结果表明：在低杂波天线端口充气的条件下，低杂波注入后端口密度会有明显的增加。端口密度与反射系数的关系与理论趋势一致，EAST上低杂波耦合的最佳密度出现在4～5×10^17m-3。

A triple Langmuir probe was installed at the top of the lower hybrid （LH） antenna in the experimental advanced superconducting tokamak （EAST）. The probe system consists of a triple probe, a measurement circuit, data acquisition and data processing. The preliminary results show that injection of LH power increases the density in front of the LH grill. The relationship between grill densities and reflection coefficients （RCs） agrees with the theoretical prediction. The optimum density for LH coupling in EAST was measured, being in range of （4-5）×10^17m-3.