PLASMA TRANSPORT STUDY BY ANLYSIS FOR TRANSIENT RESPONSES TO APPLIED

本研究的目的是通过分析等离子体对局部非均匀扰动的瞬态响应来解决等离子体输运问题。得到如下结果：(1) 1997年研究了ECRH对Heliotron E内部破坏和减少快离子损失的影响。得到了内部扰动过程中扰动幅度与压力梯度之间的滞后关系。这一观察结果要求对这一过程有一种新的解释，而这种解释不能用线性理论来描述。虽然ECRH加热电子并产生高能电子，但电位分布也可以改变。当等离子体电位变得更正时，期望共振快离子损失减少。实验证实了这一过程。(2) 1998年研究了TRIQM-1M等离子体中离子加热，研究了电子速度分布函数畸变对离子加热过程的影响。发现低频波被扭曲的电子分布激发，并将其能量传递给垂直速度分量的离子。(3) 1999年研究了双向低杂波与载流电子之间的耦合。研究发现，共动电子的电流驱动效率随双向波功率比呈非线性响应。当行波功率增大时，电流剖面由峰值向平缓突变。

The purpose of this research is to resolve the plasma transport by analysing transient responses to local non-uniform perturbations. The following results are obtained.(1)In Heliotron E internal disruption and reduction of the fast ion loss by ECRH are investigated in 1997. The hysteresis relation between the amplitude of the perturbation and the pressure gradient is obtained during the internal disruption process. This observation requires a new explanation for this process, which cannot be described by the linear theory. Although ECRH heats the elctrons and creates energetic electrons, the potential profile can be also changed. When the plasma potential becomes more positive, the reduction of the resonant fast ion loss is expected. This process is experimentally confirmed.(2)In TRIQM-1M ion heating have been studied in LHCD plasmas in 1998 The effect of the distortion of the electron velocity distribution function is studied on the ion heating process. It is found that low frequency waves are excited by distorted electron distribution and transfer their energy to ions with perpendicular velocity component.(3)The coupling between bi-directional lower hybrid waves and current carrying electrons are investigated in 1999. It is found that the current drive efficiency for the co-moving electrons shows a non linear response for the power ratio of the bi-directional waves. The abrupt current profile change from a peaked one to a flat one is observed as the ctr-travelling wave power is increased.