Improvement of SFC

• 作者: WangYifang WuDezhong ZhangXiaoqi MaLizheng HeYuan WangBing WuYijian ZhaoJianming WangZhixue ZhaoHongwei
• 来源期刊: 近代物理研究所和兰州重离子加速器实验室年报：英文版
• 学科: 物理学
• 关键词: HIRFL SFC ECR
• 年，卷（期）: 2003,（1）
• 页码范围: 134-135
• 页数: 2页
• 分类号: O484

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.