ECR辐照装置中的离子束流分布模拟

Simulation on Ion Beam Distribution in ECR Irradiation Device

面向等离子体材料作为聚变等离子体和核反应堆结构之间的主要界面,遭受恶劣的辐照条件,为了提升对面向等离子体材料的改进研究,实验室模拟聚变环境装置.基于已搭建完成的用于研究聚变反应堆中等离子体-材料相互作用的电子回旋共振(electron cyclotron resonance,ECR)直线等离子体装置,使用有限元方法计算模拟了腔室内励磁线圈与永磁体叠加磁场的分布情况以及在此背景磁场下带电粒子在磁场中的运动轨迹.结果表明:磁场模拟结果与实验数据较为符合,共振面位置随线圈电流的增大而远离微波窗口.带电粒子轨迹模拟结果与实验中近似梨形等离子体束的分布一致,且到达样品台的束流密度随着励磁线圈电流的增大而增大.该研究可为ECR直线等离子体装置的进一步优化提供参考.

Plasma-facing materials,which act as the primary interface between fusion plasma and nuclear reactor structures,are subject to harsh irradiation conditions.To improve the research of plasma-facing materials,the laboratory simulation fusion environment device is of great significance.Based on the completed ECR linear plasma device for studying the interaction between medium ions and materials in fusion reactors,the distribution of the superimposed magnetic field of the excitation coil and the permanent magnet in the chamber and the trajectory of charged particles in the magnetic field under this background magnetic field were calculated and simulated by finite element method.Results show that the magnetic field simulation results are more consistent with the experimental data,and the position of the resonant surface is far away from the microwave window with the increase of the coil current.The simulation results of the charged particle locus are consistent with the distribution of the approximately"pear-shaped"plasma beams in the experiment,and the beam density reaching the sample stage increases with the increase of the excitation coil current.This result can provide a reference for further optimization of the ECR linear plasma device.