Destabilization of low-n peeling modes by trapped energetic particles

作者：Hao G Z^*; Liu Y Q; Wang A K; Matsunaga G; Okabayashi M; Mou Z Z; Qiu X M

来源：Physics of Plasmas, 2013, 20(6): 062502.

DOI：10.1063/1.4811382

The kinetic effect of trapped energetic particles (EPs), arising from perpendicular neutral beam injection, on the stable low-n peeling modes in tokamak plasmas is investigated, through numerical solution of the mode's dispersion relation derived from an energy principle. A resistive-wall peeling mode with m/n = 6/1, with m and n being the poloidal and toroidal mode numbers, respectively, is destabilized by trapped EPs as the EPs' pressure exceeds a critical value beta*(c), which is sensitive to the pitch angle of trapped EPs. The dependence of beta*(c) on the particle pitch angle is eventually determined by the bounce average of the mode eigenfunction. Peeling modes with higher m and n numbers can also be destabilized by trapped EPs. Depending on the wall distance, either a resistive-wall peeling mode or an ideal-kink peeling mode can be destabilized by EPs.

• 出版日期2013-6
• 单位核工业西南物理研究院