Numerical simulation study on the orbit loss of runaway electron in ITER plasmas

Yagi, Masatoshi; Kagei, Yasuhiro*; Matsuyama, Akinobu

In this presentation, the simulation results on the loss rate for runaway electrons in ITER plasmas will be reported. For this purpose, runaway electron orbit following code is extended such that up-down anti-symmetric equilibrium can be handled as well as up-down symmetric equilibrium. The orbit of runaway electron is followed using drift Hamiltonian model in Boozer co-ordinates. The analytical model for perturbed magnetic field is introduced to simulate magnetic turbulence during disruption phase. The time variation of canonical angular momentum of relativistic electron in the toroidal direction is analyzed in the case with magnetic island. In addition, Poincare plot of particle orbitis done. The preliminary result indicates that the runaway electron is well confined under magnetic perturbation for ITER parameters.