电子温度对HL－1托卡马克低杂波电流驱动的影响

本文利用较简单的计算模型计算低杂波沿射线轨迹的能量沉积和电流分布。结果表明，当等离子体中心电于温度不太高（Ｔｅ＜１ｋｅＶ）时，边缘冷等离子体区电子－离子碰撞吸收的能量占相当大的比例，因此电流驱动效率较低。提高中心和边缘电子温度，将较大幅度地增加低杂波电流驱动效率，从而可解释为什么在小托卡马克中低杂波电流驱动效率比在大、中型托卡马克中小得多。

EFFECT OF THE ELECTRON TEMPERATURE ON LHCD EFFICIENCY IN THE HL-1 TOKAMAK

A simple model is presented for calculating the lower hybrid wave (LIIW) power deposit along the ray tracing and for obtaining the RF current profiles.Computations show that much of the LHW power is absorbed by electron-ion collision ncer Plasma edge when the central electron temperature is less than 1keV, and therefore the current drive efficiency islow. Under this condition, the LHCD efficiency increases in principle with increasing electron temperature. The calculated results are in agreement with that of the HL-1 tokaamklower hybrid current drive (LHCD) experiments, hence interpreting why the LHCD efficiency is lower in a large or middle sized tokamak than in a small one.