Investigation for the vertical focusing enhancement of compact cyclotron by asymmetrical shimming bar
详细信息 查看全文
- 作者：Tianjue Zhang ; tjzhang@ciae.ac.cn ; Chuan Wang chuan.wang@psi.ch ; Junqing Zhong zhongjunqing123@hotmail.com ; Hongjuan Yao yaohongjuan@mail.tsinghua.org.cn
- 关键词：AVF cyclotron ; Vertical focusing enhancement ; Asymmetric shimming bar
- 刊名：Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
- 出版年：2011
- 出版时间：15 December, 2011
- 年：2011
- 卷：269
- 期：24
- 页码：2968-2971
- 全文大小：1K
文摘
CYCIAE-100, a 100 MeV H?/sup> cyclotron under construction at China Institute of Atomic Energy (CIAE), is an AVF compact cyclotron. With energy above 70 MeV, the straight-edge sector magnet, instead of the spiral one normally used for AVF cyclotrons in this case, is still used to simplify the engineering procedures. The vertical focusing is likely not strong enough at the outer region and the Walkinshaw resonance may occur, if either the permeability decreasing tolerance in large scale pure iron castings and forgings, or the fabrication tolerance during the magnet construction, are seriously excessive. Theoretical investigation and numerical simulation results presented in this paper show that this kind of risk could be avoided by using a set of specially designed asymmetrical shimming bars between the pole edge and dummy Dee of the RF cavity at the outer region. In this way, the vertical focusing at outer radius region will increase substantially. This investigation provides a protective measure for the main magnet construction of CYCIAE-100.
© 2004-2018 中国地质图书馆版权所有 京ICP备05064691号 京公网安备11010802017129号 地址：北京市海淀区学院路29号 邮编：100083 电话：办公室：(+86 10)66554848；文献借阅、咨询服务、科技查新：66554700 |