Ring Warmup and Helium Recovery for the RHIC Accelerator: Thermal Analysis of the Warmup of a Superconducting Magnet String

  • James Rank
  • Mike Iarocci
  • Margareta Rehak
  • K. C. Wu
Part of the Advances in Cryogenic Engineering book series (ACRE, volume 43)

Abstract

RHIC design criteria require that a faulty string be warmed rapidly to a serviceable temperature. Integral electric heaters warm the superconducting magnets. The magnets are very sensitive to temperature peaks and local gradients. Helium gas is circulated during warmup so that all points are warmed at nearly equal rates. An optimized string warmup procedure gives a continuous, uniform temperature profile, that is flat and rises steadily to room temperature at a rate which allows manageable recovery of the liquid helium content of the magnets. The ideal is not easily obtained. Various warmup schemes are studied. Limitations on the process, including those of the RHIC helium recovery system are discussed. A finite difference code (Fortran) is used to model a magnet string with flowing helium and electric heat generation. Temperature dependent properties of metal and gas including variable density are accounted for. Predictions are compared to physical test data.

Keywords

Mass Flow Rate Heat Shield Internal Heat Generation Finite Difference Code Full Throttle 
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.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    RHIC Design Manual, Brookhaven National Laboratory, October, 1995.Google Scholar
  2. 2.
    R.P. Shutt, Cooldown Times for ISA Magnet Rings, Technical Note No. 17, Isabelle Division, Brookhaven National Laboratory, April, 1976.Google Scholar
  3. 3.
    H. Lierl, P. Schmuser, Cooldown of a HERA Octant Equipped with Cold Iron Dipoles, Deutsches Elektronen-Synchrotron DESY, Hamburg, Report DESY HERA 84/16, July 1984.Google Scholar
  4. 4.
    P. Cruikshank, N. Kos, G. Riddone, L. Tavian, CERN, Investigation of Thermal and Vacuum Transients on the LHC Prototype Magnet String, paper presented at CEC ‘96, Portland, OR.Google Scholar

Copyright information

© Springer Science+Business Media New York 1998

Authors and Affiliations

  • James Rank
    • 1
  • Mike Iarocci
    • 1
  • Margareta Rehak
    • 1
  • K. C. Wu
    • 1
  1. 1.Relativistic Heavy Ion Collider (RHIC)Brookhaven National LaboratoryUptonUSA

Personalised recommendations