低混杂波高N‖分量对EAST等离子体电流驱动的影响

EAST等离子体高约束模运行条件下，在等离子体边缘区域观测到明显的等离子体电流带.在EAST托卡马克装置非圆截面平衡位形下，使用射线追踪方法研究低混杂波高平行折射率N_‖分量对电流驱动的影响.结果表明：当-8≤N_‖≤-6时，平行折射率分量能够在小半径（0.7 < r/a < 1）区域驱动kA量级的等离子体电流.对于具有台基区、等离子体边缘温度更高的电子温度剖面，驱动电流的位置r/a>0.9.低混杂波朗道阻尼的理论分析与数值模拟结果一致.另外，高N_‖低混杂波在等离子体边缘的功率沉积和电流驱动与电子温度分布和发射谱分布相关.

Effect of Lower Hybrid Wave Current Drive with High Component N‖ on EAST

In EAST tokamak high confinement mode discharge, a plasma current belt was found experimentally at the edge plasmas region. For EAST plasma with non-circular cross-section equilibrium configuration, effect of high parallel refractive index N_‖ component of lower hybrid wave on current drive was numerically studied. Results of the ray-tracing platform shows that kA plasma current emerges in a region of normalized radius from 0.7 to 1.0 for 6≤N_‖≤8. For electron temperature profile with pedestal and higher plasma edge temperature, the region of drive current is r/a>0.9.A theoretical analysis of lower hybrid Landau damping in EAST tokamak was also performed. Effects of electron density profile and formation of lower hybrid wave spectrum on current drive were discussed.