Simulation of runaway electron confinement in presence of macroscopic MHD modes

巨視的MHDモード存在下における逃走電子の閉じ込めシミュレーション

矢木 雅敏; 松山 顕之; 若狭 有光*; 奴賀 秀男

Yagi, Masatoshi; Matsuyama, Akinobu; Wakasa, Arimitsu*; Nuga, Hideo

The runaway electron (RE) confinement has been investigated by a relativistic guiding-center trace code ETC-Rel using analytic expressions of the MHD modes. In this work, the nonlinear evolution of the MHD field is simulated by the 4-field reduced MHD code R4F. The use of nonlinear MHD codes allows us to treat more realistic values of the saturated amplitude and the eigenmode structure for given equilibrium. Results of the code verification for R4F, which simulates nonlinear coupling of the (2, 1) and (3, 2) tearing modes are shown. The RE confinement using nonlinear MHD simulations of density-limit disruptions with the edge radiation loss is also discussed.