Nakagawa T, Higurashi Y, Ohnishi J, Aihara T, Tamura M, Uchiyama A, Okuno H, Kusaka K, Kidera M, Ikezawa E, Fujimaki M, Sato Y, Watanabe Y, Komiyama M, Kase M, Goto A, Kamigaito O, Yano Y
Nishina Center for Accelerator Based Science, RIKEN, Hirosawa 2-1, Wako, Saitama 351-0198, Japan.
Rev Sci Instrum. 2010 Feb;81(2):02A320. doi: 10.1063/1.3259232.
The next generation heavy ion accelerator facility, such as the RIKEN radio isotope (RI) beam factory, requires an intense beam of high charged heavy ions. In the past decade, performance of the electron cyclotron resonance (ECR) ion sources has been dramatically improved with increasing the magnetic field and rf frequency to enhance the density and confinement time of plasma. Furthermore, the effects of the key parameters (magnetic field configuration, gas pressure, etc.) on the ECR plasma have been revealed. Such basic studies give us how to optimize the ion source structure. Based on these studies and modern superconducting (SC) technology, we successfully constructed the new 28 GHz SC-ECRIS, which has a flexible magnetic field configuration to enlarge the ECR zone and to optimize the field gradient at ECR point. Using it, we investigated the effect of ECR zone size, magnetic field configuration, and biased disk on the beam intensity of the highly charged heavy ions with 18 GHz microwaves. In this article, we present the structure of the ion source and first experimental results with 18 GHz microwave in detail.
下一代重离子加速器设施，如日本理化学研究所放射性同位素（RI）束流工厂，需要高强度的高电荷重离子束。在过去十年中，电子回旋共振（ECR）离子源的性能随着磁场和射频频率的增加而显著提高，以提高等离子体的密度和约束时间。此外，关键参数（磁场配置、气体压力等）对ECR等离子体的影响也已被揭示。这些基础研究为我们提供了如何优化离子源结构的方法。基于这些研究和现代超导（SC）技术，我们成功构建了新型28GHz超导ECRIS，其具有灵活的磁场配置，可扩大ECR区并优化ECR点处的场梯度。利用它，我们研究了ECR区大小、磁场配置和偏置盘对18GHz微波高电荷重离子束强度的影响。在本文中，我们详细介绍了离子源的结构以及18GHz微波的首次实验结果。
