Conceptual design of impurity spectrum research platform based on intermediate energy electron beam ion trap

Radiation loss caused by impurities in tokamak plasmas, especially of those metal impurities, is one of the crucial factors restricting the further improvement of plasma performance. [Purpose] This study aims at the atomic spectroscopy of metal impurities on fusion reactors with a conceptual design of a compact impurity spectrum research platform based on intermediate energy electron beam ion trap. [Methods] The system design scheme for a compact medium-energy impurity spectra platform (MISP) using conduct cooling low temperature superconductor was presented. Then the COMSOL simulation software was employed to design and analyze the magnetic field, and the electron beam trajectory in the electron beam ion trap (EBIT) of MISP. The magnetic field calculation, inner electrode design, spectrometer design and other auxiliary system design of the electron beam ion trap were carried out. [Results] Simulation results show that uniform magnetic field intensity of 1.0 T in the center of EBIT drift tube can be achieved with appropriate design parameters, and the electron beam can be constrained in the drift tube. [Conclusions] This concept design can provide a reference for further engineering design.

托卡马克等离子体中杂质（尤其是金属杂质）引起的辐射损失，是制约等离子体性能进一步提升的关键因素之一。[目的] 本研究针对聚变反应堆中金属杂质的原子光谱学，提出基于中能电子束离子阱（EBIT）的紧凑型杂质光谱研究平台概念设计。[方法] 提出采用传导冷却低温超导体的紧凑型中能杂质光谱平台（MISP）系统设计方案。随后利用COMSOL仿真软件对MISP的EBIT中的磁场及电子束轨迹进行设计与分析，开展电子束离子阱的磁场计算、内电极设计、光谱仪设计及其他辅助系统设计。[结果] 仿真结果表明，通过合理的设计参数，可在EBIT漂移管中心获得1.0 T的均匀磁场强度，且电子束可被约束在漂移管内。[结论] 该概念设计可为后续工程设计提供参考。