The tuning control system of third harmonic superconducting cavity in SSRF

doi:10.1007/s41365-019-0669-0

Nuclear Science and Techniques ›› 2019, Vol. 30 ›› Issue (10): 157 doi: 10.1007/s41365-019-0669-0

• SYNCHROTRON RADIATION TECHNOLOGY AND APPLICATIONS • Previous Articles Next Articles

The tuning control system of third harmonic superconducting cavity in SSRF

Peng-Peng Gong,^1,2,3 Yu-Bin Zhao,^1,3 Hong-Tao Hou,^1,3 Zhi-Gang Zhang,^1,3 Xiang Zheng,^1,3 Xiao-Yun Pu,^1,2,3 Kai Xu,^1,3 Qiang Chang,^1,3Jian-Fei Liu^1,3

¹Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
²University of Chinese Academy of Sciences, Beijing 100049, China
³Shanghai Key Laboratory of Cryogenics & Superconducting RF Technology, Shanghai 201800, China

Received:2019-01-23 Revised:2019-05-08 Accepted:2019-05-26
Contact: Jian-Fei Liu E-mail:liujianfei@sinap.ac.cn

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Peng-Peng Gong, Yu-Bin Zhao, Hong-Tao Hou, Zhi-Gang Zhang, Xiang Zheng, Xiao-Yun Pu, Kai Xu, Qiang Chang, Jian-Fei Liu. The tuning control system of third harmonic superconducting cavity in SSRF.Nuclear Science and Techniques, 2019, 30(10): 157 doi: 10.1007/s41365-019-0669-0

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Abstract

Abstract: Beam lifetime is dominated by Touschek scattering at the Shanghai Synchrotron Radiation Facility (SSRF). Touschek loss rate is affected by probability for scattering beyond the RF acceptance and the volume charge density of the bench. In the phase II upgrade of the SSRF, a third harmonic superconducting cavity will be used to enhance the Touschek lifetime by lengthening the bunches. The Touschek lifetime improvement factor is affected by the voltage of a harmonic cavity. To stabilize the cavity voltage, a tuning control system was designed to control it. The design of the tuning control system was based on the SSRF third generation low-level RF control system. Some hardware and specialized algorithms were redesigned to fit the harmonic cavity control. The design of the tuning control system is complete, and the control system has been tested. The test result shows that the fluctuation of amplitude is < ±0.34% within 1.5 h, which satisfies the stability requirement.

Key words: Passive harmonic cavity, Low level radio frequency, Shanghai Synchrotron Radiation Facility, Touschek lifetime

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The tuning control system of third harmonic superconducting cavity in SSRF

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