Simulation and optimization of helium pressure sensitivity coefficient in the HWR019 superconducting cavity

Subjects: Nuclear Science and Technology >> Radiation Physics and Technology submitted time 2024-04-08

Xiaoli Li Mengxin Xu Yuan He Zehua Liang Shengxue Zhang Chunlong Li Lubei Liu Qitong Huang Tong Liu Jiyu Wang Guochang Liu Zhi Wang Tiancai Jiang Pinan Xiang Zhijun Wang Yangyang Yang

Abstract： For the superconducting linac section of the Chinese Accelerator Driven Transmutation Research facility (CiADS) operating in continuous wave (CW) mode, the effect of cavity detuning caused by fluctuations of liquid helium pressure is an important factors for stable operation of low β cavities. Aiming at the phenomenon of unstable operation of half-wave superconducting resonators affected by helium pressure fluctuations, and taking the half-wave superconducting resonator with a frequency of 162.5 MHz and an optimal beta of 0.19(HWR019) applied in CiADS superconducting linac section as an example, the fluctuation of liquid helium pressure and the frequency variation law of the cavity was simulated with the method of numerical simulation. By calculating and analyzing the relationship between the contact area of liquid helium in the cavity, the wall thickness of the cavity, the shape of the liquid helium cooling channel, and the helium pressure sensitivity coefficient (K_Press) of the cavity, the goal of reducing the (K_Press) value of the HWR019 superconducting cavity to close to 0 was achieved, which effectively ensures the stable operation of the superconducting cavity in CiADS. At the same time, by conducting thermodynamic calculations on the cavity, corresponding enhanced heat transfer schemes were provided, effectively reducing the maximum temperature of the superconducting cavity during operation. The analysis and optimization methods also have reference significance for the same type of low β superconducting cavities.

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