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

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Abstract

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 \(\beta\) 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.

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Acknowledgements

The authors would like to thank Prof. Y. K. Wu and Dr. H. Hao from the Duke Free Electron Laser Lab (DFELL) for their previous work on developing the tune knob. We would also like to thank the scientists and engineers at NSRL who give us valuable suggestions and helped us prepare the machine study.

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Authors and Affiliations

  1. National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, 230029, China

    Si-Wei Wang, Wei Xu, Xian Zhou, Wen-Bo Wu, Bing Li & Ke Xuan

  2. Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, China

    Jing-Yi Li

Authors
  1. Si-Wei Wang
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  2. Wei Xu
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  3. Xian Zhou
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  4. Wen-Bo Wu
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  5. Bing Li
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  6. Ke Xuan
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  7. Jing-Yi Li
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Corresponding author

Correspondence to Wei Xu.

Additional information

This work was supported by the National Natural Science Foundation of China (Nos. 11375177 and 11705200).

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Wang, SW., Xu, W., Zhou, X. et al. Development of a tune knob for lattice adjustment in the HLS-II storage ring. NUCL SCI TECH 29, 176 (2018). https://doi.org/10.1007/s41365-018-0513-y

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  • DOI: https://doi.org/10.1007/s41365-018-0513-y

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