Adjusting the accelerating field distribution of a superconducting CH cavity

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XU Meng-Xin, HE Yuan, ZHANG Sheng-Hu and XIA Jia-Wen. Adjusting the accelerating field distribution of a superconducting CH cavity[J]. Chinese Physics C, 2015, 39(5): 057009. doi: 10.1088/1674-1137/39/5/057009
XU Meng-Xin, HE Yuan, ZHANG Sheng-Hu and XIA Jia-Wen. Adjusting the accelerating field distribution of a superconducting CH cavity[J]. Chinese Physics C, 2015, 39(5): 057009.  doi: 10.1088/1674-1137/39/5/057009 shu
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Received: 2014-08-13
Revised: 1900-01-01
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Adjusting the accelerating field distribution of a superconducting CH cavity

    Corresponding author: XU Meng-Xin,

Abstract: In a superconducting CH (cross bar H mode) cavity, the method of regulating the length of a drift tube is employed to adjust the distribution of the accelerating field. In this article, we simulate the electromagnetic field of a CH structure to illustrate the reason for adjusting the field distribution by varying drift tube length. Meanwhile, that the presence of the drift tube will cause a sharp rise in the maximum electric field is also shown. This phenomenon is contrary to superconducting cavity design principles in which the cavity geometry needs to be optimized to reduce the maximum electric field to avoid field emission. We propose a variable diameter superconducting CH cavity design to solve this conflict. The simulation of the variable diameter superconducting CH cavity shows that this method is feasible.

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