射频波电流驱动抑制双撕裂模不稳定性研究

摘要

Controlling double tearing modes instability by radio frequency (RF) wave current drive was explored by using numerical simulation with incompressible magnetohydrodynamics (MHD) in a periodic cylinder.The results show that a localized driven current along the background current direction on rational surfaces in Tokamak device has a suppression effect on the 3/1 double tearing modes instability,and the optimal initial localized driven current is current with Icd=4％I and δcd=0.07a.In addition,only when the localized driven current is injected before the fast growth stage,the double tearing modes can be suppressed.%采用不可压缩磁流体模型,在圆柱位形下研究了射频波电流驱动对双撕裂模不稳定性的影响.结果表明,托卡马克装置中沉积在有理面上的同向驱动电流能有效减缓3/1双撕裂模的发展.电流驱动幅值约占等离子体电流初始值的4％、驱动电流沉积宽度约为小环半径的7％时,抑制效果较好.此外,研究表明,在双撕裂模进入快速增长阶段前加入外部驱动电流,才能有效抑制撕裂模的磁爆发.