作　　者： ; ;

机构地区： 中国科学院等离子体物理研究所

出　　处： 《强激光与粒子束》 1996年第2期163-168,共6页

摘　　要： ＨＴ—６Ｍ表面加热实验中实现了Ｈ模式放电。分析了Ｈα谱线，ＣⅢ和ＯⅡ谱线在Ｌ—Ｈ和Ｈ—Ｌ模转化过程中的变化情况，讨论了边界条件、粒子循环。 H-mode has been found on ASDEX since 1982. Many Tokamaks have achieved H-mode with different experiment. The mechanism, however, for achieving the H-mode is still not entirely understood, but there is considerable evidence that edge recycling can play a critical role. Recently, H-mode has been achieved on HT-6M Tokamak by applying Edge Ohmic Heating under a good wall condition. The changes of H α, O Ⅱ and C Ⅲ during H-mode, L-H and H-L transition have been studied. The influences of the edge condition, the recycling of particle and impurity on H-mode ,L-H and H-L transition have been discussed. While EOH power field is supplied, the loop voltage suddenly increases, the electron is accelerated and produced partly runaway electron which bump into the wall and the limiter. The impurity and hydrogen influxes increase by sputtering and desorption. The radiation of C Ⅲ,O Ⅱ and H α lines increases. The discharge appears L-mode. The impurity intrudes into plasmas, especially, the edge plasma, to increase the ohmic heating power, while the electron density is lower. In the other hand.since the plasma current increasment is mainly located at the edge after EOH. The edge electron temperature rises quickly. The ion temperature also gradually increases by collision between electronand ion, and ion collision frequency decreases. In a word, the wall condition and recycling can play a critical role during L-H transition. The sustained duration of L-mode depends on the wall condition and the eletron density at the edge. Since the particle confinement gradually improves, and the particle recycling coefficient decreases, the radiation of C Ⅲ, O Ⅱ and H α lines gradually reduces during L-H transition. The impurity influx is effectively suppressed by sawteeth oscillation.The impurity (C,O) seem to be concentrated at the edge region because of the rising of the electron density and temperature at the edge, and the particle recycling coefficient gradually increases bexause of the rising of the electrondensity

关 键 词： 表面加热 模 托卡马克

领　　域： [核科学技术] [核科学技术]