Abstract: The work investigated the MHD induced energetic particle loss and redistribution based on CFETR physics parameters and NTM numerical simulation results. The new method of phase vector rotation is to determine the KAM surfaces broken or not with following the test orbit pairs and recording the joint vector rotation in each small domains of phase space, which indicates the orbit stochasticity. The particle redistribution and loss can be derived with the stochastic template. The work demonstrated the distribution of energetic alpha particles and obtained the stable particle profile with the method of phase vector rotation. The work did not find resonant island within trapped particle region, the MHD perturbation and finite collisions can induce a loss channel near the trapped-passing boundary region of phase space. 

Key words: CFETR, Alpha particle, Guiding center orbit, Instability

摘要： 在中国聚变工程实验堆(CFETR)设计参数下，利用一种高能量粒子(EP)物理简化模型分析了磁流体 动力学(MHD)不稳定中新经典撕裂模(NTM)引起的粒子再分布和损失。相位矢量旋转法利用 EP 相空间中小间隔 区域内跟踪探测粒子对来判定粒子轨道随机与否，即记录连接矢量旋转角的方法标记该区域是否存在 KAM 面破缺，以此为据修正相空间的粒子分布函数和判断粒子损失。利用相空间探测粒子对相位矢量旋转法标记一定 NTM 幅度下的随机区域分布并迭代得到稳态分布剖面。对捕获粒子区域的共振岛探测结果表明，低频或零频率扰动不 会与高能量 α粒子形成有效共振，MHD 扰动和有效碰撞效应可能使捕获-通行轨道边界附近形成损失通道。

关键词: CFETR, α 粒子, 导心轨道, 不稳定性