Improving Touschek lifetime and synchrotron frequency spread by passive harmonic cavity in the storage ring of SSRF

doi:10.1007/s41365-017-0259-y

Abstract

Abstract:

Beam lifetime of a synchrotron is dominated by Touschek scattering. In the beamline Phase II project of Shanghai synchrotron radiation facility, a passive third harmonic cavity is to be installed for bunch lengthening and instability suppressing. In this paper, the beam dynamics of the cavity is investigated. The parameters of passive operation are optimized to cancel the slope of RF voltage and lengthen the bunches. The Touschek lifetime increases are estimated for optimum and non-optimum voltage flattening. A tolerance of the operation is studied in case that there is a shift on detuning angle. The effect caused by reduction in harmonic voltage generated by lengthened bunch distribution is also estimated using iteration method. An increase in synchrotron frequency spread due to nonlinearity of the voltage giving to the bunch is found by using tracking simulation. This spread can help in damping coupled bunch instability through Landau damping.

Key words: Landau damping, Passive harmonic cavity, SSRF

[1]	Fang-Zhou Chen, Zhi-Chu Chen, Yi-Mei Zhou, Ning Zhang, Bo Gao, Xing-Yi Xu, Yong-Bin Leng. Touschek lifetime study based on the precisely bunch-by-bunch BCM system at SSRF [J]. Nuclear Science and Techniques, 2019, 30(9): 144-144.
[2]	Dandan JIA, Min ZHANG, Yongjun LI, Shuai WU, Limin JIN, Song XUE. Design of the super-small angle Canted front-end at SSRF [J]. Nuclear Techniques, 2019, 42(9): 90101-090101.
[3]	Shanshan CAO, Yongbin LENG, Renxian YUAN, Longwei LAI. Study on precise bunch current measurement based on dual cavity monitor [J]. Nuclear Science and Techniques, 2019, 42(4): 40101-040101.
[4]	Hui YUAN, Yubin ZHAO, Xiang ZHENG, Pengpeng GONG, Xuefang HUANG, Yangyang XIA, Shenjie ZHAO, Zhigang ZHANG, Kai XU, Qiang CHANG, Jianfei LIU. Design and implementation of high performance frequency synthesizer for SSRF [J]. Nuclear Science and Techniques, 2019, 42(4): 40105-040105.
[5]	Wei-Zhe Zhang, Jian-Chao Tang, Si-Sheng Wang, Zhi-Jun Wang, Wen-Ming Qin, Jian-Hua He. The protein complex crystallography beamline (BL19U1) at the Shanghai Synchrotron Radiation Facility [J]. Nuclear Science and Techniques, 2019, 30(11): 170-170.
[6]	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 [J]. Nuclear Science and Techniques, 2019, 30(10): 157-157.
[7]	ZHAO Zilong, XU Huichao, GONG Peirong. Management and query system for the beamline operation data based on Archiver Appliance at SSRF [J]. Nuclear Techniques, 2018, 41(3): 30102-030102.
[8]	CHEN Fangzhou, LAI Longwei, YAN Yingbing, LENG Yongbin. Development of a test platform for digital beam position monitor processor at SSRF [J]. Nuclear Techniques, 2017, 40(11): 110102-110102.
[9]	LI Changliang, TIAN Shunqiang, ZHANG Wenzhi. Study on the vertical emittance for the SSRF Phase II project [J]. Nuclear Techniques, 2016, 39(5): 50102-050102.
[10]	Yong Yang, Yong-Bin Leng, Ying-Bing Yan, Wei-Min Zhou, Ren-Xian Yuan, Zhi-Chu Chen. Development of the bunch-by-bunch beam position acquisition system based on BEEcube [J]. Nuclear Science and Techniques, 2016, 27(2): 47-47.
[11]	JIANG Bo-Cheng, LIN Guo-Qiang, WANG Bao-Liang, ZHANG Man-Zhou, YIN Chong-Xian, YAN Ying-Bing, TIAN Shun-Qiang, WANG Kun. Multi-bunch injection for SSRF storage ring [J]. Nuclear Science and Techniques, 2015, 26(5): 50101-050101.
[12]	ZHOU Yongnian, ZHANG Zhaohong, LIU Ping, GU Songqi, JIANG Zheng, LI Yongping, ZHENG Lifang. QXAFS data acquisition and control based on DCM [J]. Nuclear Techniques, 2015, 38(5): 50101-050101.
[13]	YANG Tie-Ying, WEN Wen, YIN Guang-Zhi, LI Xiao-Long, GAO Mei, GU Yue-Liang, LI Li, LIU Yi, LIN He, ZHANG Xing-Min, ZHAO Bin, LIU Ting-Kun, YANG Ying-Guo, LI Zhong, ZHOU Xing-Tai, and GAO Xing-Yu. Introduction of the X-ray diffraction beamline of SSRF [J]. Nuclear Science and Techniques, 2015, 26(2): 20101-020101.
[14]	JIA Wen-Hong, MA Shi-Wei, and ZHENG Li-Fang . The control system for water-cooled DCMS in SSRF [J]. Nuclear Science and Techniques, 2015, 26(2): 20103-020103.
[15]	GENG Helong, LENG Yongbin, ZHOU Weimin, LAI Longwei, SHEN Tong, YAN Yingbing. Storage ring beam orbit interlock system upgrade for SSRF [J]. Nuclear Techniques, 2015, 38(10): 100101-100101.

Nuclear Science and Techniques

Improving Touschek lifetime and synchrotron frequency spread by passive harmonic cavity in the storage ring of SSRF

Abstract

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