用于回旋加速器的大电流直流负离子源。

High current DC negative ion source for cyclotron.

作者信息

Etoh H, Onai M, Aoki Y, Mitsubori H, Arakawa Y, Sakuraba J, Kato T, Mitsumoto T, Hiasa T, Yajima S, Shibata T, Hatayama A, Okumura Y

机构信息

Sumitomo Heavy Industries, Ltd., Tokyo 141-6025, Japan.

Graduate School of Science and Technology, Keio University, Kanagawa 223-8522, Japan.

出版信息

Rev Sci Instrum. 2016 Feb;87(2):02B135. doi: 10.1063/1.4934613.

DOI:10.1063/1.4934613

PMID:26932017

Abstract

A filament driven multi-cusp negative ion source has been developed for proton cyclotrons in medical applications. In Cs-free operation, continuous H(-) beam of 10 mA and D(-) beam of 3.3 mA were obtained stably at an arc-discharge power of 3 kW and 2.4 kW, respectively. In Cs-seeded operation, H(-) beam current reached 22 mA at a lower arc power of 2.6 kW with less co-extracted electron current. The optimum gas flow rate, which gives the highest H(-) current, was 15 sccm in the Cs-free operation, while it decreased to 4 sccm in the Cs-seeded operation. The relationship between H(-) production and the design/operating parameters has been also investigated by a numerical study with KEIO-MARC code, which gives a reasonable explanation to the experimental results of the H(-) current dependence on the arc power.

摘要

已开发出一种用于医学应用质子回旋加速器的细丝驱动多尖负离子源。在无铯运行中，分别在3千瓦和2.4千瓦的电弧放电功率下，稳定获得了10毫安的连续氢负离子束和3.3毫安的氘负离子束。在加铯运行中，在2.6千瓦的较低电弧功率下，氢负离子束电流达到22毫安，同时共引出电子电流较少。在无铯运行中，产生最高氢负离子电流的最佳气体流量为15标准立方厘米每分钟，而在加铯运行中，该流量降至4标准立方厘米每分钟。还通过使用KEIO-MARC代码的数值研究，研究了氢负离子产生与设计/运行参数之间的关系，这对氢负离子电流与电弧功率相关性的实验结果给出了合理的解释。