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 (12): 176 doi: 10.1007/s41365-018-0513-y


Development of a tune knob for lattice adjustment in the HLS-II storage ring

Si-Wei Wang 1 • Wei Xu 1 • Xian Zhou 1 • Wen-Bo Wu 1 • Bing Li 1 • Ke Xuan 1 • Jing-Yi Li 2   

  1. 1 National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, China
    2 Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
  • Contact: Wei Xu
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (Nos. 11375177 and 11705200).
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Si-Wei Wang, Wei Xu, Xian Zhou, Wen-Bo Wu, Bing Li, Ke Xuan, Jing-Yi Li. Development of a tune knob for lattice adjustment in the HLS-II storage ring.Nuclear Science and Techniques, 2018, 29(12): 176     doi: 10.1007/s41365-018-0513-y


The betatron tune is an important parameter in a storage ring to enable stable operation. A tune adjustment tool with a small impact on the beam dynamics is useful for user operation and machine studies. Therefore, a tune knob is developed for the Hefei light source-II (HLS-II) storage ring. Owing to the compactness of the storage ring, a global adjustment mechanism is adopted. To reduce the impact on beam injection, only quadrupole families outside the injection section are used by the tune knob, and the β functions of the injection section remain unchanged. A code is developed based on the accelerator simulation software, MAD-X, to calculate the adjustment of the quadrupole strengths. The accelerator toolbox is used to double check the accuracy of the tune knob. Online measurement of the tune knob is also performed. The result shows that the tune knob works well when the tune is adjusted in a specific range. Betatron coupling measurement is also carried out, showing an application of the tune knob on machine studies. In this paper, the development of the tune knob and its experimental results in the HLS-II storage ring are reported in detail.

Key words: Tune knob, Storage ring, Beta function, Betatron coupling