The effects of a radial electric field (EF) on the losses of alpha particles and neutral beam injection (NBI) fast ions in typical ITER operation scenarios for both error fields due to test blanket modules (TBMs) and toroidal field (TF) ripple were evaluated using an iterative method to execute an orbit-following Monte-Carlo code and a one-dimensional transport code. The EF effect on the loss of fast ions strongly depends on the operation scenario as well as on the error field. The electric field is very significant in the loss of fast ions in a 9 MA ITER operation scenario with a higher safety factor and in the error field associated with TBMs. The EF effect in the error field of TF ripple is very small in any operation scenario. The electric field is much more significant for the loss of NBI fast ions than for that of alpha particles. The radial electric field changes the toroidal precession of fast ions and consequently alters their condition of resonance with the error field, which may account for the EF effect on the loss of fast ions in ITER with TBMs.
摘要：针对典型ITER运行场景中，测试包层模块（TBM）误差场和环向场波纹（TF波纹）误差场对α粒子及中性束注入（NBI）快速离子损失的影响，采用迭代方法结合轨道追踪蒙特卡罗程序与一维输运程序，评估了径向电场（EF）的作用。EF对快速离子损失的影响显著依赖于运行场景及误差场类型。在安全因子较高的9 MA ITER运行场景及TBM相关误差场条件下，电场对快速离子损失的影响非常显著。而在TF波纹误差场情形下，EF效应在任何运行场景中均很小。此外，电场对NBI快速离子损失的影响远大于对α粒子的影响。径向电场改变了快速离子的环向进动，进而改变其与误差场的共振条件，这可能是ITER中TBM误差场条件下EF影响快速离子损失的主要机制。