Beam steering correction of the quarter wave resonator in the HISCL

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LIU Shu-Hui, WANG Zhi-Jun, ZHANG Cong and HE Yuan. Beam steering correction of the quarter wave resonator in the HISCL[J]. Chinese Physics C, 2014, 38(10): 107007. doi: 10.1088/1674-1137/38/10/107007
LIU Shu-Hui, WANG Zhi-Jun, ZHANG Cong and HE Yuan. Beam steering correction of the quarter wave resonator in the HISCL[J]. Chinese Physics C, 2014, 38(10): 107007.  doi: 10.1088/1674-1137/38/10/107007 shu
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Received: 2013-11-06
Revised: 1900-01-01
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Beam steering correction of the quarter wave resonator in the HISCL

    Corresponding author: LIU Shu-Hui,
    Corresponding author: WANG Zhi-Jun,
    Corresponding author: HE Yuan,

Abstract: The Intensity Heavy Ion Superconducting Linear Accelerator as the injector of the High Intensity Heavy-Ion Accelerator Facility, which is a new project proposed in China has been designed. One of the design options in the low energy part is based on Quarter Wave Resonators (QWRs). However, because of the unsymmetrical geometry of the cavity, there are dipole fields near the beam hole, which may steer the beam vertically, thus leading to emittance growth and beam loss. The effect of the dipole mode field is analyzed, and a method to overcome the beam steering effect by placing QWRs with opposite orientation is proposed in this paper. The simulation results show that the beam steering effect is reduced effectively by this method, and the deviation of the beam centroid is decreased from 2.87 mm to 0.1 mm. The emittance growth is also smaller.

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