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Study of the movable collimator for CEPC

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Abstract

Background Movable collimators for the circular electron positron collider (CEPC) are required to cut off spent electrons/positrons just near the beam orbit and reduce the background of the detector. Due to the extremely high energy and luminosity of CEPC, a lot of challenges are brought to the collimators, including the huge synchrotron radiation power, the high-energy beam impact, and low impedance requirement. Purpose The purpose of this paper is to design a movable collimator suitable for CEPC and calculate its performance. Method Based on geant4 simulations and finite element method (FEM) analyses, a lot of studies were done: synchrotron radiation power, thermal and mechanical calculation, beam impact, and impedance, respectively. Result The maximum temperature of the design during normal operation is 143 \(^{\circ }\)C, and the loss factor is only 0.021 V/pC ignoring the shielding of clearance. Conclusions The conceptual design of collimator was completed, and the calculations show the design can work well under normal operating condition.

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Acknowledgements

This work was supported by Key Laboratory of Particle Acceleration Physics & Technology,Institute of High Energy Physics, Chinese Academy of Sciences [JSQ2020ZZ05] .

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Authors and Affiliations

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

    Peng Zhang, Haijing Wang, Sha Bai, Yudong Liu & Huamin Qu

  2. University of Chinese Academy of Sciences, Beijing, 100049, China

    Peng Zhang

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  1. Peng Zhang
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  2. Haijing Wang
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  3. Sha Bai
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  4. Yudong Liu
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  5. Huamin Qu
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Correspondence to Haijing Wang.

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Zhang, P., Wang, H., Bai, S. et al. Study of the movable collimator for CEPC. Radiat Detect Technol Methods 5, 339–346 (2021). https://doi.org/10.1007/s41605-021-00253-w

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  • DOI: https://doi.org/10.1007/s41605-021-00253-w

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