微调以最小化日本质子加速器研究中心射频驱动H⁻离子源的发射度。

Fine-tuning to minimize emittances of J-PARC RF-driven H⁻ ion source.

作者信息

Ueno A, Ohkoshi K, Ikegami K, Takagi A, Asano H, Oguri H

机构信息

J-PARC Center, Tokai-Mura, Naka-Gun, Ibaraki-Ken 319-1195, Japan.

出版信息

Rev Sci Instrum. 2016 Feb;87(2):02B130. doi: 10.1063/1.4932573.

DOI:10.1063/1.4932573

PMID:26932012

Abstract

The Japan Proton Accelerator Research Complex (J-PARC) cesiated RF-driven H(-) ion source has been successfully operated for about one year. By the world's brightest level beam, the J-PARC design beam power of 1 MW was successfully demonstrated. In order to minimize the transverse emittances, the rod-filter-field (RFF) was optimized by changing the triple-gap-lengths of each of pairing five piece rod-filter-magnets. The larger emittance degradation seems to be caused by impurity-gases than the RFF. The smaller beam-hole-diameter of the extraction electrode caused the more than expected improvements on not only the emittances but also the peak beam intensity.

摘要

日本质子加速器研究设施（J-PARC）的铯涂覆射频驱动H(-)离子源已成功运行约一年。凭借世界上最亮的束流，成功实现了J-PARC设计的1兆瓦束流功率。为了使横向发射度最小化，通过改变五对杆状滤波磁体每对的三间隙长度对杆状滤波场（RFF）进行了优化。与RFF相比，较大的发射度退化似乎是由杂质气体引起的。引出电极较小的束流孔直径不仅使发射度得到了超出预期的改善，而且使束流峰值强度也得到了改善。