A preliminary quadrupole asymmetry study of a Iβ=0.12 superconducting single spoke cavity

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YANG Zi-Qin, LU Xiang-Yang, YANG Liu, LUO Xing, ZHOU Kui and QUAN Sheng-Wen. A preliminary quadrupole asymmetry study of a Iβ=0.12 superconducting single spoke cavity[J]. Chinese Physics C, 2014, 38(10): 107001. doi: 10.1088/1674-1137/38/10/107001
YANG Zi-Qin, LU Xiang-Yang, YANG Liu, LUO Xing, ZHOU Kui and QUAN Sheng-Wen. A preliminary quadrupole asymmetry study of a Iβ=0.12 superconducting single spoke cavity[J]. Chinese Physics C, 2014, 38(10): 107001.  doi: 10.1088/1674-1137/38/10/107001 shu
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Received: 2013-11-12
Revised: 1900-01-01
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A preliminary quadrupole asymmetry study of a Iβ=0.12 superconducting single spoke cavity

    Corresponding author: LU Xiang-Yang,

Abstract: An Accelerator Driven System (ADS) has been launched in China for nuclear waste transmutation. For the application of high intensity proton beam acceleration, the quadrupole asymmetry effect needs to be carefully evaluated for cavities. Single spoke cavities are the main accelerating structures in the low energy front-end. The single spoke cavity has small transverse electromagnetic field asymmetry, which may lead to transverse RF defocusing asymmetry and beam envelope asymmetry. A superconducting single spoke resonator (PKU-2 Spoke) of β =0.12 and f=325 MHz with a racetrack-shaped inner conductor has been designed at Peking university. The study of its RF field quadrupole asymmetry and its effect on transverse momentum change has been performed. The quadrupole asymmetry study has also been performed on a β =0.12 and f=325 MHz ring-shaped single spoke cavity. Our results show that the quadrupole asymmetry is very small for both the racetrack-shaped and the ring-shaped single spoke cavity.

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