Author: Chouhan, S.
Paper Title Page
WEPVA143 Cooling-down and Cooling of Superconducting Magnets at 4.5K with Very Little Liquid Helium using Coolers* 3606
 
  • M.A. Green, S. Chouhan
    FRIB, East Lansing, USA
 
  Funding: This work is supported in part by a grant from the National Science Foundation. The Michigan State University grant number is PHY0958726.
Because liquid helium is often in short supply, it is often difficult to get helium for cooling superconducting magnets that are too large to be cryogen free magnets. Grade A helium is often available in high-pressure bottles, but not in large quantities. This report describes how one can cool-down and maintain a constant temperature of ~4.5 K in a superconducting magnet that has less than 5 L of liquid in the cryostat once it has been filled with liquid helium. One can do this with either GM coolers in the drop-in mode with pulsed tube coolers. The number of coolers needed to cool the magnet depends to the heat load at 4.5 K and the desired cool-down time for the magnet system. This type of cooling system is suitable for magnets that are away from a conventional large helium refrigeration system. Examples are S/C insertion (wigglers and undulators), spectrometer magnets, and ECR ion source magnets.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPVA143  
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