学术报告
HT-7/EAST系列学术报告
  您现在的位置:首页 > 学术交流 > 学术报告
  
7月14日 Hybrid simulation of fishbone instabilities in the EAST tokamak
五室第八十七期研讨会
2017-07-13|点击: | 【 【打印】【关闭】

  题  目:Hybrid simulation of fishbone instabilities in the EAST tokamak

  报告人:申 伟

  时  间:2017年7月14日(星期五)  15:00—16:00

  地  点:506办公室

  摘  要:

  Hybrid simulations with the global kinetic-magnetohydrodynamic (MHD) code M3D-K have been carried out to investigate the linear stability and nonlinear dynamics of beam-driven fishbone in the Experimental Advanced Superconducting Tokamak (EAST) experiment. Linear simulations show that a low frequency fishbone instability is excited at experimental value of beam ion pressure. The mode is mainly driven by low energy beam ions via precessional resonance. The results are consistent with the experimental measurement with respect to mode frequency and mode structure. When the beam ion pressure is increased to exceed a critical value, the low frequency mode transits to a beta-induced Alfvén eigenmode (BAE) with much higher frequency. This BAE is driven by higher energy beam ions. Nonlinear simulations show that the frequency of the low frequency fishbone chirps up and down with corresponding hole-clump structures in phase space, consistent with the Berk-Breizman theory. In addition to the low frequency mode, the high frequency BAE is excited during the nonlinear evolution. For the transient case of beam pressure fraction where the low and high frequency modes are simultaneously excited in the linear phase, only one dominant mode appears in the nonlinear phase with frequency jumps up and down during nonlinear evolution.

  ~欢迎感兴趣的同志参加~

 
 
Copyright@2010  中国科学院等离子体物理研究所 版权所有
地址:中国安徽合肥蜀山湖路350号     邮编:230031     电话:+86-0551-65591307     传真:+86-0551-65591310
微信二维码

微信平台