Study on Production Mechanism of Multiply-Charged Heavy Ions in ECR Ion Source

ECR离子源多电荷重离子产生机理研究

• 批准号: 62420006
• 负责人: SEKIGUCHI Masayuki
• 金额: $ 20.48万
• 依托单位: Institute for Nuclear Study, University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (A)
• 财政年份: 1987
• 资助国家: 日本
• 起止时间: 1987 至 1989
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-62420006/
• 关键词: Ion Source; ECR; Heavy ions; Heavy-ion source; Heavy-ion beams; Accelerator

The aim of this research has been to investigate production mechanism of multiply-charged heavy ions in ECR ion source through designing, manufacturing, tuning, and using an ECR ion source(SF-ECR) with a 6.4-GHz microwave power source for the SF cyclotron of the Institute for Nuclear Study, University of Tokyo. SF-ECR started to produce beams in 1988. In addition, a compact ECR source(HiECR) was studied at 6.4-GHz and 14.25-GHz microwave frequencies.[1] Studies carried out on SF-ECR ion source at 6.4-GHz microwave frequency (a) SF-ECR was studied with one closed ECR zone (mode I). It was found that this mode has excellent performance for gassous ions up to Ar. (b) SF-ECR was studied with two closed ECR zones (mode II). It was found that this mode has similar performance to that of mode I. (c) Comparison between the performances of the two modes which have different magnetic field distributions, however, showed that the mode II seems to have larger potentiality than mode I for producing higher current of ions in higher-charge states. (d) SF-ECR was installed at the SF cyclotron and performance was tested as a whole system. Since it showed satisfactory results, SF-ECR started routine operation.[2] Studies carried out on HiECR ion source at 6.4-GHz microwave frequency This compact source turned out to have also a good performance comparable to SF-ECR. It produced higher current for ions in lower-charge states than SF-ECR, but lower current for ions in higher-charge states.[3] Studies on performance of HiECR at 14.25-GHz microwave frequency A 14.25-GHz microwave power-source system was installed at a test bench. Investigation on performance of HiECR started at this frequency.

本研究的目的是通过为东京大学核研究所的 SF 回旋加速器设计、制造、调谐和使用具有 6.4 GHz 微波电源的 ECR 离子源 (SF-ECR)，研究 ECR 离子源中多电荷重离子的产生机制。 SF-ECR 于 1988 年开始生产光束。此外，还研究了 6.4 GHz 和 14.25 GHz 微波频率的紧凑型 ECR 源（HiECR）。[1]在 6.4 GHz 微波频率下对 SF-ECR 离子源进行的研究 (a) 使用一个封闭的 ECR 区域（模式 I）研究 SF-ECR。研究发现，该模式对于 Ar 以内的气态离子具有优异的性能。 (b) 使用两个封闭的 ECR 区域（模式 II）研究 SF-ECR。结果发现，该模式与模式 I 具有相似的性能。(c) 然而，比较具有不同磁场分布的两种模式的性能，表明模式 II 似乎比模式 I 具有更大的潜力，可以在较高电荷态下产生更高的离子电流。 (d) SF-ECR 安装在 SF 回旋加速器上，并作为整个系统进行性能测试。由于效果满意，SF-ECR开始常规运行。[2]在 6.4 GHz 微波频率下对 HiECR 离子源进行的研究证明，这种紧凑型离子源还具有与 SF-ECR 相当的良好性能。与 SF-ECR 相比，它可为处于较低电荷状态的离子产生更高的电流，但为处于较高电荷状态的离子产生较低的电流。 [3] 14.25 GHz 微波频率下 HiECR 性能研究 在测试台上安装了 14.25 GHz 微波电源系统。对 HiECR 性能的研究从此频率开始。

项目成果

服部俊幸他: "Development of Higher Order Mode ECR(HiECR)Ion Source(Test of 6 GHz Operation)" Proceedings of 7th Symposium on Accelerator Science and Technology,1989. 71-85 (1989)

Toshiyuki Hattori等人：“高阶模式ECR（HiECR）离子源的开发（6 GHz操作测试）”第七届加速器科学技术研讨会论文集，1989年71-85（1989）。

M. Oyaizu: Proceedings of the 6th Symposium on Accelerafor Science and Technology. 83 (1987)

M. Oyaizu：第六届 Accelerafor Science and Technology 研讨会论文集。

M. Sekiguchi: Proceedings of the International Conference on ECR ION Sources and Their Appllcations.

M. Sekiguchi：ECR 离子源及其应用国际会议记录。

服部俊幸,他: "Development of Higher Order Mode ECR(HiECR)Ion Source-Preliuinary results for firsttrial-" Proceedings of 14th Linear Accelerator Meeting in Japan,1989. 129-131 (1989)

Toshiyuki Hattori 等人：“高阶模式 ECR(HiECR) 离子源的开发 - 第一次试验的初步结果 -”日本第 14 届直线加速器会议记录，1989 年 (1989 年)。

大城幸光,他: "First Operation of the ECR Ion Source at the INS SF Cyclotron" Proceedings of 7th Symposium on Accelerator Science and Techuology,1989. 65-67 (1989)

Yukimitsu Oshiro 等人：“INS SF 回旋加速器 ECR 离子源的首次操作”第七届加速器科学与技术研讨会论文集，1989 年 65-67（1989 年）。