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VACUUM ›› 2023, Vol. 60 ›› Issue (5): 66-70.doi: 10.13385/j.cnki.vacuum.2023.05.10

• Vacuum Acquisition System • Previous Articles     Next Articles

Design of Automatic Pumping System for Liquid Nitrogen Cooling Monochromators of SSRF

WANG Jin-wei1,2, LI Jin-ming1,2, LIU Jun-nan1,2, CHEN Ming1,2   

  1. 1. Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201204, China;
    2. Shanghai Synchrotron Radiation Facility, Shanghai 201204, China
  • Received:2022-10-25 Online:2023-09-25 Published:2023-09-26

Abstract: In view of the problems of condensation and dripping water and frost on the outside of the interlayer caused by decreasing vacuum degree for the vacuum interlayer of some beamline liquid nitrogen cooling monochromators, and the loss of cooling capacity of the liquid nitrogen pipeline in the Shanghai Synchrotron Radiation Facility, which threaten the operation safety. An automatic pumping system with vacuum feedback and timing start function is designed. Simulation and calculation of the cooling loss under different vacuum degrees of the interlayer help to determine the vacuum degree threshold and other parameters for the system to start. The as-designed pumping system currently works well on beamline liquid nitrogen cooling monochromators, helping to stabilize the beamline operation.

Key words: liquid nitrogen cooling monochromator, operation safety, pumping system design

CLC Number:  TL503.7;TB75

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