低杂波驱动电流改善等离子体约束的光谱测量

在ＨＴ－６Ｂ托卡马克低杂波驱动电流（ＬＨＣＤ）的同时，等离子体的粒子及能量约束也随之发生改善。我们从空间多道Ｈα线的测量推算出ＬＨＣＤ可将等离子体粒子约束时间提高１－５倍，介绍了我们的分析过程，ＨＴ－６Ｂ上的Ｈα线测量还表明粒子约束的改善程度与低杂波（ＬＨＷ）的注入功率无明显依赖关系；改善粒子约束的发生与超热电子的产生相对应，通过观察边界层ＯＩＩ两条不同激发电位的谱线强度比的变化，发现等离子体在约束改善的同时，具有边界电子温度梯度增大的类Ｈ模现象。关键词：

SPECTROSCOPIC DIAGNOSTIC RESULTS OF THE IMPROVED PLASMA CONFINEMENT BY LOW HYBRID CURRENT DRIVE

The plasma energy and particle confinement could be improved by LHCD in HT-6B tokamak. A multichannel La monitoring system was used for the measure-ment of particle oonfinement in the experiment. The particle confinement time has been increased two to six times by LHCD. There is no apparent relation between the τ_p increment degree and the input LHW power (10-60 kW). But there is a good correlation between the appearance of improvement and the appearance o: the energetic electrons caused by LHCD. With the measurement of emissivity ratio of OII 441.8 nm and OII 446.6 nm within the plasma edge(r=8.5-11.0 cm for α=12 cm). We discovered that, when improvememt happened, the gradient of electron temperature in plasma edge increased, the same tendency of the change“in the case of H-mode.