低杂波电流驱动中的雪崩逃逸增强及鱼骨不稳定性

等离子体中存在的一定数量的高能逃逸电子（E≥1MeV)通过大角度库仑散射从等离子体中碰撞出二次电子，二次电子被低杂波有效地加速成为逃逸电子，这些逃逸电子又被正反馈回等离子体，形成雪崩现象。在此过程中，一部分获得较大横向动量的二次电子或由低杂波驱动的高能电子可能被香蕉轨道捕获，这些被捕获在磁岛中的电子与某种模式的磁场扰动共振时，就出现鱼骨不稳定现象。

ENHANCEMENT OF RUNAWAY AVALANCHE DURING LHCD AND FISHBONE INSTABILITY

Certain amount of highly energetic runaway electrons in a plasma can knock out bulk electrons through large angle Coulomb scattering,and these secondary electrons can be effectively accelerated to become runaway electrons by lower hybrid current drive (LHCD).These runaway electrons can be returned to the plasma by positive feedback,and this process leads to an avalanche effect.During this process, some secondary electrons with larger poloidal momentum or a part of energetic electrons driven by LHCD are trapped in the banana trajectory.When certain magnetic oscillations are resonant with the electrons trapped in the magnetic island,the fishbone instability appears.