Electromagnetic design and optimization of a superconducting quarter wave resonator

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YANG Liu, LU Xiang-Yang, QUAN Sheng-Wen, YAO Zhong-Yuan, LUO Xing and ZHOU Kui. Electromagnetic design and optimization of a superconducting quarter wave resonator[J]. Chinese Physics C, 2013, 37(2): 027001. doi: 10.1088/1674-1137/37/2/027001
YANG Liu, LU Xiang-Yang, QUAN Sheng-Wen, YAO Zhong-Yuan, LUO Xing and ZHOU Kui. Electromagnetic design and optimization of a superconducting quarter wave resonator[J]. Chinese Physics C, 2013, 37(2): 027001.  doi: 10.1088/1674-1137/37/2/027001 shu
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Received: 2012-03-16
Revised: 1900-01-01
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Electromagnetic design and optimization of a superconducting quarter wave resonator

    Corresponding author: LU Xiang-Yang,

Abstract: Superconducting (SC) cavities currently used for the acceleration of protons at a low velocity range are based on half wave resonators. Due to the rising demand on high current, the issue of beam loading and space charge problems has arisen. Qualities of low cost and high accelerating efficiency are required for SC cavities, which are properly fitted by using an SC quarter wave resonator (QWR). We propose a concept of using QWRs with frequency 162.5 MHz to accelerate high current proton beams. The electromagnetic design and optimization of the prototype have been finished at Peking University. An analytical model derived by the transmission line theory is used to predict an optimal combination of the geometrical parameters, with which the calculation by Microwave Studio shows a good agreement. The thermal analysis to identify the temperature rise of the demountable bottom plate under various levels of thermal contact also has been done, and the maximum increment is less than 0.5 K even though the contact state is poor.

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