The Shanghai Low Energy Electron Beam Ion Trap (EBIT) Roger Hutton (罗杰) Modern Physics Institute (MPI) Fudan University Collaborators: Prof. Yaming Zou (MPI Director) Drs: Xiao Jun, Yang Yang and Shen Yang Graduate Students: Zejie Fei, Xeulong Jin, Ruifeng Zhao, Wenxian Li and Lu Di. Dr. Leif Liljeby (Stockholm University) Dr. Sven Huldt (Lund University)

Outline: 1) Motivation The Low Energy EBIT 3) Some current spectra 4) Conclusion

Motivation for this development: Many laboratory and astrophysical plasmas have electron temperatures below say 1 keV. Our big EBIT, which runs using super conduction coils to generate the magnetic field, was not really designed to give electron beam energies below around 1.5 keV. Hence we designed and constructed an EBIT optimized for a low energy electron beams with the intention of studying the spectroscopy of Tungsten (and other fusion related elements) in charge states between around 5+ and 40+.

The Shanghai EBIT Electron energy range from around 1.5 KeV up to 200 KeV (130 KeV reached) Beam current, reached 150 mAmps Magnetic field up to 5 T Currently under re-installation after some modifications.

2. SH-PermEBIT装置简介 Shanghai permanent magnet EBIT(永磁EBIT) 设计参数：能量: 250-5000eV 束流: 10 mA 磁场: 0.5T

可见光谱探测系统 真空紫外光探测系统 注气系统 PermEBIT主体

Electron beam transmission for a number of beam energies (beam current about 5 mAmps). Vcathode/KV -1.95 Vdt2/KV -1.80 -1.85 -1.87 -1.90 -1.91 -1.93 -1.94 Ebeam/KeV 0.15 0.10 0.08 0.05 0.04 0.02 0.01 Rate100/% 81.83 60.78 51.43 41.48 34.60 18.66 12.00

Ar光谱测试 3) Spectra 20100408_1651SiLi_1.9A_-3.4kV9.6mA_Ar1.2E-5_DT_400V_700V_200V-80V Trap0.2s_0.1s_A12512s_1.0E-8

Ar光谱的研究 Ar的X射线光谱研究 Ar的真空紫外光谱研究 Ar的可见光谱研究

W光谱研究进展 现阶段我们主要通过注入W(CO)6（六羰基钨）调节束流强度能量等条件对W的可将光区域进行初步探索研究。

W

SH-HtscEBIT开发与研究 在SH-PermEBIT的基础上优化，拓展电子束低能至50eV。 液氮筒4.7L 核心区 钛金属外壳和磁体骨架 在SH-PermEBIT的基础上优化，拓展电子束低能至50eV。 SH-HtscEBIT在磁体、腔体材料、结构等多方面做了改进，整体的计使其更适合低能情况下的运行，目前正在加工阶段。 Shanghai High temperature superconductor EBIT (高温超导EBIT) 设计参数：能量: 50-5000eV 束流: 10 mA 磁场: 0.4T （max） 采用高温超导线绕制磁体，可 减小体积，进一步改善系统真 空环境，同时可提高光子探测 效率 。 永磁体改为电磁体，磁场大小连续可调

4) Conclusion The Shanghai low energy EBIT appears to work well. We have used the EBIT to record spectra with electron beams energies as low as 60 eV. Beam currents up to around 10 mA are possible, but below around 200 eV the beam current depends on the beam energy. The EBIT was first tested using argon injection and currently we are injecting tungsten through W(CO)6

谢 谢 ！ Thank you for your attention !