Study on cooling process of cryogenic system for superconducting magnets of BEPCⅡ

  • In the upgrade project of the Beijing Electron Positron Collider (BEPCⅡ), three superconducting magnets are employed to realize the goal of two orders of magnitude higher luminosity. A cryogenic system with a total capacity of 0.5~kW at 4.5~K was built at the Institute of High Energy Physics (IHEP) to support the operations of these superconducting devices. For preparing the commissioning of the system, the refrigeration process was simulated and analyzed numerically. The numerical model was based on the latest engineering progress and focused on the normal operation mode. The pressure and temperature profiles of the cryogenic system are achieved with the simulation. The influence of the helium mass flow rates to cool superconducting magnets on the thermodynamic parameters of their normal operation is also studied and discussed in this paper.

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  • [1] . BEPCц Group. Design Report of BEPCц. Beijing: Insti-tute of High Energy Physics, Chinese Academy of Sciences,20022. LI Z Q. Study on Optimization Design of Superconducting RF Cavities for BEPCц. Ph. D. Dissertation. Beijing:Institute of High Energy Physics, Chinese Academy of Sci-ences, 2003 (in Chinese)3. CHEN F S. Design of Special Type Magnet and Study of Quench Protection System for BEPC/Interaction Re-gion. Ph. D. Dissertation. Beijing: Institute of High Energy Physics, Chinese Academy of Sciences, 2006 (in Chinese)4. ZHU Z A, ZHAO L et al. The BES0 Detector Magnet.Proceedings of ICEC20. Oxford: Eisevier, 2005. 593-5965. BEPCцGroup. IHEP-BEPCц-SB-03-5. Beijing: Institute of High Energy Physics, Chinese Academy of Sciences, Nov.20036. BNL Magnet Division. Design Report for the BEPC/ Su-perconducting IR Magnets, AM-NO-328. Brookhaven National Laboratory, 20037. Lierl H. Technology of Cryogenic for Storage Rings. Pro-ceedings of EPAC98, Stockholm. Sweden, 1998. 194-1998. XU Q J, ZHU Z A et al. Thermal Design of BES0 Magnet.Proceedings of ICEC20, Oxford: Eisevier, 2005. 601-6039. XU Q J. Thermal Analysis for the Detector Superconducting Magnets in High Energy Physics Field. Ph. D. Dissertation. Beijing: Technical Institute of Physics and Chemistry,Chinese Academy of Sciences, 2006 (in Chinese)10. White Frank M. Fluid Mechanics. McGraw-Hill, 1979.332-34111. Van Sciver W. Helium Cryogenics. New York: PlenumPress, 1986. 256-26012. McAdams W H, Woods W K, Bryan R L. VaporizationInside Horizontal Tubes II. Benzene-oil Mixtures, Trans.1942, ASME 64. 19313. Weisend II J G. Handbook of Cryogenic Engineering. Tay-lor Francis, 1998. 370-37114. YANG S M, TAO W Q. Heat Transfer. Beijing: Higher Education Press, 1998. 332-335 (in Chinese)15. HEPAK (. copyright Cryodata Inc.) is a Computer Pro-gram for Calculating the Thermo Physical Properties ofHelium. Horizon Technology, version 3.4, Colorado, USA16. DENG J Z et al. Computing Method. Xi'an: Xi'an Jiaotong University Press, 1985 (in Chinese)
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ZONG Zhan-Guo, LIU Li-Qiang, XIONG Lian-You, LI Shao-Peng, XU Qing-Jin, HE Kun, ZHANG Liang and GAO Jie. Study on cooling process of cryogenic system for superconducting magnets of BEPCⅡ[J]. Chinese Physics C, 2008, 32(9): 761-765. doi: 10.1088/1674-1137/32/9/016
ZONG Zhan-Guo, LIU Li-Qiang, XIONG Lian-You, LI Shao-Peng, XU Qing-Jin, HE Kun, ZHANG Liang and GAO Jie. Study on cooling process of cryogenic system for superconducting magnets of BEPCⅡ[J]. Chinese Physics C, 2008, 32(9): 761-765.  doi: 10.1088/1674-1137/32/9/016 shu
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Received: 2007-11-13
Revised: 2008-01-04
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Study on cooling process of cryogenic system for superconducting magnets of BEPCⅡ

    Corresponding author: LIU Li-Qiang,

Abstract: 

In the upgrade project of the Beijing Electron Positron Collider (BEPCⅡ), three superconducting magnets are employed to realize the goal of two orders of magnitude higher luminosity. A cryogenic system with a total capacity of 0.5~kW at 4.5~K was built at the Institute of High Energy Physics (IHEP) to support the operations of these superconducting devices. For preparing the commissioning of the system, the refrigeration process was simulated and analyzed numerically. The numerical model was based on the latest engineering progress and focused on the normal operation mode. The pressure and temperature profiles of the cryogenic system are achieved with the simulation. The influence of the helium mass flow rates to cool superconducting magnets on the thermodynamic parameters of their normal operation is also studied and discussed in this paper.

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