# Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2018, Vol. 29 ›› Issue (11): 153

• NUCLEAR ELECTRONICS AND INSTRUMENTATION •

### Development of a control system for the fourth-harmonic cavity of the HLS storage ring

Wen-Bo Wu 1 • Ke Xuan 1 • Wei Xu 1 • Ji-Gang Wang 1 • Chuan Li 1 • Gong-Fa Liu 1 • Cong-Feng Wu 1 • Jing-Yi Li 1,2

1. 1 National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, China
2 Institute of High Energy Physics, CAS, Beijing 100049, China
• Contact: Wei Xu E-mail:wxu@ustc.edu.cn
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Wen-Bo Wu, Ke Xuan, Wei Xu, Ji-Gang Wang, Chuan Li, Gong-Fa Liu, Cong-Feng Wu, Jing-Yi Li. Development of a control system for the fourth-harmonic cavity of the HLS storage ring.Nuclear Science and Techniques, 2018, 29(11): 153
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Abstract:

Harmonic RF cavities are commonly used in storage rings to lengthen the bunches and thus suppress the beam’s instabilities and increase its Touschek lifetime. The voltage and phase of the electromagnetic fields in the harmonic cavity are of great importance for stretching the bunch. In the Hefei Light Source storage ring, a passive fourth-harmonic cavity is installed, and the cavity is monitored and controlled by an analog control module provided by its manufacturer. To vary and maintain the voltage of the harmonic cavity in a more effective way, a digital proportional, integral, and derivative feedback system based on the Experimental Physics and Industrial Control System is developed on top of the analog control module. This paper reports the details of the development of this voltage control system. Some test and operational results are also presented.