Refrigeration Options for the Advanced Light Source Superbend Dipole Magnets

  • M. A. Green
  • E. H. Hoyer
  • R. D. Schlueter
  • C. E. Taylor
  • S. T. Wang
  • J. Zbasnik
Chapter
Part of the Advances in Cryogenic Engineering book series (ACRE)

Abstract

The 1.9 GeV Advance Light Source (ALS) at the Lawrence Berkeley National Laboratory (LBNL) produces photons with a critical energy of about 3.1 keV at each of its thirty-six 1.3 T gradient bending magnets. It is proposed that at three locations around the ring the conventional gradient bending magnets be replaced with superconducting bending magnets with a maximum field of 5.6 T. At the point where the photons are extracted, their critical energy will be about 12 keV. In the beam lines where the SuperBend superconducting magnets are installed, the X ray brightness at 20 keV will be increased over two orders of magnitude. This report describes three different refrigeration options for cooling the three SuperBend dipoles. The cooling options include: 1) liquid helium and liquid nitrogen cryogen cooling using stored liquids, 2) a central helium refrigerator (capacity 70 to 100 W) cooling all of the SuperBend magnets, 3) a Gifford McMahon (GM) cryocooler on each of the dipoles. This paper describes the technical and economic reasons for selecting a small GM cryocooler as the method for cooling the SuperBend dipoles on the LBNL Advanced Light Source.

Keywords

Titanium Total Heat Helium Expense Refrigeration 

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References

  1. 1.
    C. E. Taylor and S. Caspi, “A. 6.3 T Bend Magnet for the Advanced Light Source,” IEEE Trans. Magnetics 32, No 4, (1996)Google Scholar
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    A. Lietzke, “SuperBend 4 Magnetic Measurements,” LBNL Superconducting Magnet Group Internal Report SC-MAG 633, September 1998Google Scholar
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    M. A. Green and R. Byrns, “An Update on Estimating the Cost of Cryogenic Refrigeration,” Advances in Cryogenic Engineering 43, p 1661, Plenum Press, (1997)Google Scholar
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    J. Zbasnik, et al, “Tests of a GM Cryocooler and High Tc Leads for Use on the ALS SuperBend Magnets,” presented at the 1999 Cryogenic Engineering Conference, Montreal Quebec, Canada, 13 to 16 July 1999, this Proceedings Advances in Cryogenic Enginnering 45, Plenum Press, New York (1999)Google Scholar

Copyright information

© Springer Science+Business Media New York 2000

Authors and Affiliations

  • M. A. Green
    • 1
  • E. H. Hoyer
    • 1
  • R. D. Schlueter
    • 1
  • C. E. Taylor
    • 1
  • S. T. Wang
    • 2
  • J. Zbasnik
    • 1
  1. 1.Lawrence Berkeley National LaboratoryUniversity of CaliforniaBerkeleyUSA
  2. 2.Wang NMR IncorporatedLivermoreUSA

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