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Residual orbit of BC bump for CSNS/RCS

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Abstract

Background

In a beam cycle, there is a chicane bump (BC bump) in the injection region of the China Spallation Neutron Source (CSNS). It is a core part of the injection system and the important guarantee that the Linac beam injecting into the rapid cycling synchrotron (RCS). During the beam commissioning, the residual orbit of BC bump, i.e., the closed-orbit distortion (COD) due to the imperfect BC bump, was an important problem which can affect the orbit correction and beam loss control of the RCS.

Purpose

The purpose is to develop a suitable method to judge and correct the residual orbit of BC bump.

Methods

According to the physics design, there is no residual orbit of BC bump in theory. However, if the residual orbit of BC bump exists in the actual operation, the circular beam orbit outside the injection region would be affected. By comparing the circular beam orbit outside the BC bump region in theory and that is measured in the actual operation, whether the residual orbit of BC bump exists can be judged. By using the three auxiliary windings of BC magnets, the residual orbit of BC bump can be corrected.

Results

The numerical simulation results showed that the measurement and correction methods had worked well and they can be applied to the beam commissioning of CSNS/RCS. The measurement results in the machine study showed that the residual orbit of BC bump is not large and can be reduced by the three auxiliary windings of BC magnets.

Conclusion

The methods to judge and correct the residual orbit of BC bump worked well and had been applied to the beam commissioning of CSNS/RCS.

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Acknowledgements

The authors would like to thank T.G. Xu, J.L. Sun and other CSNS colleagues for the discussions and consultations.

Funding

Funding was provided by National Natural Science Foundation of China (Grant No. U1832210).

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Authors and Affiliations

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

    Ming-Yang Huang, Sheng Wang & Shouyan Xu

  2. Dongguan Institute of Neutron Science, Dongguan, 523808, China

    Ming-Yang Huang, Sheng Wang & Shouyan Xu

Authors
  1. Ming-Yang Huang
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  2. Sheng Wang
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  3. Shouyan Xu
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Corresponding author

Correspondence to Ming-Yang Huang.

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Huang, MY., Wang, S. & Xu, S. Residual orbit of BC bump for CSNS/RCS. Radiat Detect Technol Methods 3, 50 (2019). https://doi.org/10.1007/s41605-019-0128-9

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  • DOI: https://doi.org/10.1007/s41605-019-0128-9

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