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Chinese Physics C> 2014, Vol. 38> Issue(6) : 067005 DOI: 10.1088/1674-1137/38/6/067005

Vibration research of the AC dipole-girder system for CSNS/RCS

  • The China Spallation Neutron Source (CSNS) is a high intensity proton accelerator based facility. Its accelerator complex includes two main parts: an H- linac and a rapid cycling synchrotron (RCS). The RCS accumulates the 80 MeV proton beam and accelerates it to 1.6 GeV, with a repetition rate of 25 Hz. The AC dipole of the CSNS/RCS is operated at a 25 Hz sinusoidal alternating current which causes severe vibration. The vibration will influence the long-term safety and reliable operation of the magnet. The dipole magnet of CSNS/RCS is an active vibration equipment, which is different from the ground vibration accelerator. It is very important to design and study the dynamic characteristics of the dipole-girder system. This paper takes the AC dipole and girder as a specific model system. A method for studying the dynamic characteristics of the system is put forward by combining theoretical calculation with experimental testing. The ANSYS simulation method plays a very important role in the girder structure design stage. With this method, the mechanical resonance phenomenon was avoided in the girder design time. At the same time the dipole vibratory force will influence the other equipment through the girder. Since it is necessary to isolate and decrease the dipole vibration, a new isolator was designed to isolate the vibratory force and decrease the vibration amplitude of the magnet.
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    [1] WEI Jie, FU Shi-Nian, FANG Shou-Xian. Proceedings of EPAC 2006[2] WEI Jie, CHEN He-Sheng, CHEN Yan-Wei et al. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associa-ated Equipment, 2009, 600: 10-13[3] Doose C, Sharma S. MEDSI02, APS, Chicago 2002. 133-139[4] ZHANG Lin, Lesourd M, Lewis T. PAC2001, 2001. 1465-1467[5] Hermans L, Vender Auweraer H. Mechanical Systems and Signal Processing, 1999, 13(2): 193-216[6] LIU Ren-Hong, ZHANG Jun-Song, QU Hua-Min, WANG Hai-Jing. Nuclear Science and Techniques, 2012, 23: 328-331[7] Ward H, Stefan L, Paul S. Modal Analysis Theory and Testing. Beijing: Beijing Institute of Technology Press, 2001. 1-70[8] Ibrahim S. AIAA Journals of Spacecraft and Rockets 15/5. 1978, 313-316[9] LIU Ren-Hong, QU Hua-Ming, KANG Ling et al. Chinese Physics C (HEP NP), 2013, 37(8): 087002

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LIU Ren-Hong, ZHANG Jun-Song, QU Hua-Min, KANG Ling, WANG Mo-Tuo, WANG Guang-Yuan and WANG Hai-Jing. Vibration research of the AC dipole-girder system for CSNS/RCS[J]. Chinese Physics C, 2014, 38(6): 067005. doi: 10.1088/1674-1137/38/6/067005
LIU Ren-Hong, ZHANG Jun-Song, QU Hua-Min, KANG Ling, WANG Mo-Tuo, WANG Guang-Yuan and WANG Hai-Jing. Vibration research of the AC dipole-girder system for CSNS/RCS[J]. Chinese Physics C, 2014, 38(6): 067005.  doi: 10.1088/1674-1137/38/6/067005 shu
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Received: 2013-07-15
Revised: 1900-01-01
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Vibration research of the AC dipole-girder system for CSNS/RCS

    Corresponding author: LIU Ren-Hong,
  • Received Date: 2013-07-15
  • Accepted Date: 1900-01-01
  • Available Online: 2014-06-05

Abstract: The China Spallation Neutron Source (CSNS) is a high intensity proton accelerator based facility. Its accelerator complex includes two main parts: an H- linac and a rapid cycling synchrotron (RCS). The RCS accumulates the 80 MeV proton beam and accelerates it to 1.6 GeV, with a repetition rate of 25 Hz. The AC dipole of the CSNS/RCS is operated at a 25 Hz sinusoidal alternating current which causes severe vibration. The vibration will influence the long-term safety and reliable operation of the magnet. The dipole magnet of CSNS/RCS is an active vibration equipment, which is different from the ground vibration accelerator. It is very important to design and study the dynamic characteristics of the dipole-girder system. This paper takes the AC dipole and girder as a specific model system. A method for studying the dynamic characteristics of the system is put forward by combining theoretical calculation with experimental testing. The ANSYS simulation method plays a very important role in the girder structure design stage. With this method, the mechanical resonance phenomenon was avoided in the girder design time. At the same time the dipole vibratory force will influence the other equipment through the girder. Since it is necessary to isolate and decrease the dipole vibration, a new isolator was designed to isolate the vibratory force and decrease the vibration amplitude of the magnet.

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