Harisaki Shuhei, Onishi Koji, Hamada Kouta, Takeda Tatsuto, Okumura Kazuki, Omori Takayuki, Kubo Wataru, Ishihara Masaki, Kato Yushi
Division of Electrical, Electronic and Information Engineering, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita-shi, Osaka 565-0871, Japan.
Rev Sci Instrum. 2020 Jan 1;91(1):013308. doi: 10.1063/1.5128472.
Electron cyclotron resonance ion sources (ECRISs) are used in various fields such as accelerator physics, engineering, cancer therapy, and ion engines in the satellite. We are aiming to improve the production of multicharged ions efficiently at the point of view from the length of multipole magnets and vacuum conditions in the ECRIS. The diameter of the connection pipe between the main chamber and diffusion pump was made larger to improve vacuum conductance. Moreover, the length of multipole magnets with the direction along the geometrical axis in the ECRIS was extended. The effects of these improvements are investigated experimentally to measure the pressure in the vacuum chamber, beam intensity, charge state distributions of extracted ion beams, and plasma parameters. The purity of extracted ion beams and magnetic confinement have been enhanced. These results are expected to have positive effects on the production of various species and synthesized ion beams, e.g., production of iron endohedral fullerene in the future experiments in the ECRIS.
电子回旋共振离子源（ECRISs）应用于多个领域，如加速器物理、工程、癌症治疗以及卫星中的离子发动机。我们旨在从ECRIS中多极磁体的长度和真空条件的角度高效提高多电荷离子的产生。主腔与扩散泵之间连接管的直径增大以提高真空导率。此外，沿ECRIS几何轴方向的多极磁体长度被延长。通过实验研究这些改进措施的效果，以测量真空腔中的压力、束流强度、提取离子束的电荷态分布以及等离子体参数。提取离子束的纯度和磁约束得到了增强。这些结果有望对各种离子种类和合成离子束的产生产生积极影响，例如在未来ECRIS实验中生产内嵌富勒烯铁。
