Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2019, Vol. 30 ›› Issue (7): 104 doi: 10.1007/s41365-019-0629-8

• ACCELERATOR, RAY AND APPLICATIONS • Previous Articles     Next Articles

Effects of systematic octupole coupling resonances

Hong-Jin Zeng1, 2, 3, 4 S. Y. Lee5 Shu-Xin Zheng1, 2, 3 Hong-Juan Yao1, 2, 3 Xue-Wu Wang1, 2, 3 Hui Ning4  Xiao-Jun Meng4   

  1. 1 Key Laboratory of Particle and Radiation Imaging (Tsinghua University), Ministry of Education, Beijing 100084, China
    2 Laboratory For Advanced Radiation Sources and Application, Tsinghua University, Beijing 100084, China
    3 Department of Engineering Physics, Tsinghua University, Beijing 100084, China
    4 Northwest Institute of Nuclear Technology, Xi’an 710024, China
    5 Department of Physics, Indiana University, Bloomington, IN 47405, USA
  • Received:2018-11-07 Revised:2019-02-22 Accepted:2019-03-20
  • Contact: Hong-Jin Zeng E-mail:hongjin@pku.edu.cn
  • Supported by:
    This work was supported by U.S. National Science Foundation (No. PHY-1504778).
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Hong-Jin Zeng, S. Y. Lee, Shu-Xin Zheng, Hong-Juan Yao, Xue-Wu Wang, Hui Ning, Xiao-Jun Meng. Effects of systematic octupole coupling resonances.Nuclear Science and Techniques, 2019, 30(7): 104     doi: 10.1007/s41365-019-0629-8

Abstract: The Xi’an proton accelerator facility synchrotron lattice has a systematic fourth-order resonance. The systematic octupole component in dipole magnets is found to have no adverse effect on the dynamic aperture in multiparticle tracking. The frequency map shows particles locked onto the 2ν x −2ν z =0 2νx−2νz=0 resonance. However, we will show that the instantaneous betatron tunes can vary widely around the resonance line for particles locked onto the resonance.

Key words: Octupole, Coupling resonance, Dynamic aperture, XiPAF