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Automatic Pumpdown of the 2K Cold Compressors for the CEBAF Central Helium Liquefier

  • B. S. Bevins
  • W. C. Chronis
  • M. S. Keesee
Part of the A Cryogenic Engineering Conference Publication book series (ACRE, volume 41)

Abstract

The 2K system at CEBAF includes four stages of centrifugal cold compressors that operate between a suction pressure of 0.031 atm and a discharge of ~ 1 atm. Starting the cold compressors and pumping the system down to operating pressure is a complex and time consuming operation. Many months of rigorous testing were required to develop a reliable startup procedure. This procedure has been automated through the development of an Autopumpdown program that intelligently coordinates the necessary steps across the boundaries of the existing cryogenic and accelerator control systems. This program has greatly reduced both the time and effort required to recover from failures and restart the system. The paper describes the requirements addressed by the program, the steps it takes while operating, the historical development of the program, the spin-off benefits, and the course of anticipated future developments.

Keywords

Radio Frequency Speed Ratio Radio Frequency Power Suction Pressure Valve Position 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    M. S. Keesee et al. “The CEBAF Control System for the CHL,” to be published in the 1995 Advances in Cryogenic Engineering.Google Scholar
  2. 2.
    W. C. Chronis et al. “Commissioning of the CHL Refrigerator at CEBAF,” to be published in the 1995 Advances in Cryogenic Engineering.Google Scholar

Copyright information

© Plenum Press, New York 1996

Authors and Affiliations

  • B. S. Bevins
    • 1
  • W. C. Chronis
    • 1
  • M. S. Keesee
    • 1
  1. 1.Continuous Electron Beam Accelerator FacilityNewport NewsUSA

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