Effective improvement of beam lifetime based on radiofrequency phase modulation at the HLS-Ⅱ storage ring

• 作者: Yun-Kun Zhao Bao-Gen Sun Ji-Gang Wang Fang-Fang Wu Ping Lu Tian-Yu Zhou San-Shuang Jin
• 来源期刊: 核技术（英文版）
• 年，卷（期）: 2021,（1）
• 所属期刊栏目: SYNCHROTRON RADIATION TECHNOLOGY AND APPLICATIONS
• 页码范围: 1-9
• 页数: 9页
• 语种: 英文

摘要

A radiofrequency (RF) phase modulation method is applied to the Hefei Light Source Ⅱ storage ring to deeply investigate its longitudinal beam characteristics and improve the beam lifetime. A theoretical analytical model and corresponding experimental measurements of single bunch length and island phenomena are examined. From a series of online machine experiments, we demon-strate that the suitable phase modulation amplitude is 0.02 rad, corresponding to an optimum modulation frequency ranging from 19.6 to 20.7 kHz of the RF system. Fur-thermore, the overall beam lifetime can be increased by a factor of 2.38 as a result of the beam dilution effect.