Koivisto H, Ikonen A, Kalvas T, Kosonen S, Kronholm R, Marttinen M, Tarvainen O, Toivanen V
Department of Physics, University of Jyväskylä, P.O. Box 35, FI-40014 Jyväskylä, Finland.
Rev Sci Instrum. 2020 Feb 1;91(2):023303. doi: 10.1063/1.5128860.
An innovative 18 GHz HIISI (Heavy Ion Ion Source Injector) room temperature Electron Cyclotron Resonance (ECR) ion source (ECRIS) has been designed and constructed at the Department of Physics, University of Jyväskylä (JYFL), for the nuclear physics program of the JYFL Accelerator Laboratory. The primary objective of HIISI is to increase the intensities of medium charge states (M/Q ≅ 5) by a factor of 10 in comparison with the JYFL 14 GHz ECRIS and to increase the maximum usable xenon charge state from 35+ to 44+ to serve the space electronics irradiation testing program. HIISI is equipped with a refrigerated permanent magnet hexapole and a noncylindrical plasma chamber to achieve very strong radial magnetic confinement with B = 1.42 T. The commissioning of HIISI began in Fall 2017, and in Spring 2019, it has met the main objectives. As an example, the intensity of the Xe ion beam has improved from 20 μA to 230 μA. In addition, the beam intensity of the Xe ion beam has exceeded the requirement set by the irradiation testing program. The performance of HIISI is comparable to superconducting ECR ion sources with the same maximum microwave frequency of 18 GHz and a total power of 3 kW. For example, Ar and Xe ion beam intensities of 130 μA and 106 μA, respectively, have been obtained with a total microwave power of 3 kW distributed between 18, 17.4, and 14.5 GHz frequencies. The ion beams have been extracted through an 8 mm plasma electrode aperture using 15-17 kV extraction voltage. The latest development work, extracted ion beam intensities, special features, and future prospects of HIISI are presented in this paper.
于韦斯屈莱大学（JYFL）物理系，为 JYFL 加速器实验室的核物理项目设计并建造了一台创新型 18 GHz 重离子离子源注入器（HIISI）室温电子回旋共振（ECR）离子源（ECRIS）。HIISI 的主要目标是，与 JYFL 14 GHz ECRIS 相比，将中等电荷态（M/Q ≅ 5）的强度提高 10 倍，并将最大可用氙电荷态从 35+ 提高到 44+，以服务于空间电子辐照测试项目。HIISI 配备了一个制冷永久磁铁六极和一个非圆柱形等离子体腔室，以实现 B = 1.42 T 的非常强的径向磁约束。HIISI 的调试工作于 2017 年秋季开始，在 2019 年春季已实现主要目标。例如，Xe 离子束的强度已从 20 μA 提高到 230 μA。此外，Xe 离子束的束流强度已超过辐照测试项目设定的要求。HIISI 的性能与具有相同 18 GHz 最大微波频率和 3 kW 总功率的超导 ECR 离子源相当。例如，在 18 GHz、17.4 GHz 和 14.5 GHz 频率之间分配 3 kW 的总微波功率时，分别获得了 130 μA 和 106 μA 的 Ar 和 Xe 离子束强度。离子束通过一个 8 mm 的等离子体电极孔径，使用 15 - 17 kV 的提取电压进行提取。本文介绍了 HIISI 的最新研发工作、提取的离子束强度、特点及未来前景。
