Improvement of SFC

查看全文 作　　者：Wang Yifang, Wu Dezhong, Zhang Xiaoqi, Ma Lizheng, He Yuan, Wang Bing Wu Yijian, Zhao Jianming, Wang Zhixue and Zhao Hongwei 出　　处：《近代物理研究所和兰州重离子加速器实验室年报:英文版》索引2003年第1期,共2页 摘　　要：The Heavy Ion Research Facility at Lanzhou (HIRFL) is a cyclotron complex in which a Sector Focusing Cyclotron (SFC) with energy constant K=69 as an injector was converted from the original existing conversional cyclotron with diameter 1.5 m. In the process of operation for about 20 years, some shortages were exposed. For example, the vacuum pressure of SFC is only 10^-4 Pa magnitude, in the case most of the heavier ions will be lost in it. Because the yoke of SFC was not changed in the fabricated process, while the diameter of accelerator is changed from 1.5 m to 1.7 m, so the magnetic saturation is very serious in the yoke. The stay magnetic field around the cyclotron is very strong. It affects not only the beam tuning in vertical process coming from ECR ion source, but also the extraction beam behind SFC. The performance of RF system is worse than that before because of long time operation, so it is difficult to obtain satisfactorv Dee voltage. 关 键 词：HIRFL SFC ECR