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Abstract

High-energy colliders play an indispensable role in particle physics and high-energy physics. Beam screen is one of the key parts in the high-energy collider. It is used to transfer the heat generated by the beam in the pipeline to a cooling system, and absorb the residual gas to the cold bore through the pumping holes on the wall of the beam screen to ensure the vacuum stability at the same time. However, in the process of transferring thermal load, the deformation caused by temperature change will affect the structural stability of the beam screen. How to reduce the deformation as much as possible while ensuring the good heat transfer performance of the beam screen is one of the key issues in optimizing the structural design of the beam screen. In this paper, the heat transfer performance and mechanical property of the beam screen model are simulated and optimized based on the ANSYS simulation results to ensure the normal and stable operation of the beam in the super proton-proton collider. For the inner surface of the outer screen of the beam screen, the method of reducing the thickness of the copper coating is used to reduce the Lorentz force generated during operation. The calculation results from the relevant theoretical models show that when the thickness of the copper coating varies from 0 to 100 μm, the copper coating with a thickness of 75 μm can reduce the maximum deformation of the outer screen of the beam screen by 70.9%, while the maximum temperature of the beam screen can be increased by 1.1%. For the inner screen of the beam screen, a design scheme in which supporting ribs are arranged at intervals is used to reinforce the structure and improve the overall structural stability of the beam screen. The calculation results show that the maximum deformation of the inner screen of the beam screen can be reduced by 86.8% and the maximum temperature of the beam screen is reduced by 7.69%, compared with the case without supporting fins, when the interval between two adjacent supporting fins is 1 pumping hole. The research results provide important theoretical reference for the design of beam screen, which is the key component of the vacuum system of the new-generation high energy particle accelerator.

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Authors and contacts

Corresponding author:Wang Jie,wangjie1@xjtu.edu.cn; Wang Sheng,shengwang@xjtu.edu.cn;

Funds:Project supported by theYoung Scientists Fund of the National Natural Science Foundation of China (Grant No. 11905170), the Fundamental Research Funds for the Central Universities (Grant No. XJH012019018), the Young Scientist Fund of the Natural Science Foundation of Shaanxi Province, China (Grant No. 2020JQ-001), the China Postdoctoral Science Foundation (Grant No. 2018M643667), the Shaanxi Provincial Postdoctoral Science Foundation, China (Grant No. 2018BSHEDZZ05), the National Natural Science Foundation of China (Grant No. 11775166), the Key Project of Intergovernmental International Sciencec and Technology Innovation Cooperation, China (Grant No. 2016YEF0128900), and the National Key Research and Development Program(Grant No. 2017YFF0104201)

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材料性能材料	密度/kg·m^–3	杨氏模量/GPa	泊松比	导热系数/W·m^–1·K^–1	热膨胀系数/10^–6K^–1
316LN不锈钢	7900	209	0.3	8.12	10.4
无氧铜	8933	137	0.338	540	8

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Vol. 70, Issue 1 - 2021-01-05

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