Advertisement

Investigations Concerning the Stability of Supercritical Helium Forced-Flow-Cooling in Secondary Circuits with Cold Helium Pumps

  • Xu Cheng
  • Wolfgang Lehmann
Chapter
Part of the Advances in Cryogenic Engineering book series (ACRE, volume 39)

Abstract

In the KfK-HELITEX facility comparative studies are being performed on helium forced-flow-cooling with the JT flow of the refrigerator and in the closed secondary cooling circuit using cold pumps. A number of advantages are in favor of forced-flow-cooling of s.c. magnets within pressure-controlled secondary circuits. Investigations carried out quite recently concerned the cooling stability in case of supercritical He I forced-flow-cooling within a closed secondary circuit under disturbing thermal loads. The effects of the delivery characteristic of two different helium pumps and of the helium pressure level have been determined.

Keywords

Mass Flow Centrifugal Pump Heating Power Piston Pump Pump Mode 
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.
    W. Lehmann, J. Minges, Operating experience with a high capacity helium pump under supercritical conditions, Adv. Cryog. Eng., 29: 813–820 (1984).CrossRefGoogle Scholar
  2. 2.
    J. Hübener et al., A one-cylinder piston pump for high capacity forced-flow-cooling with supercritical helium, Proc. ICEC 10, Helsinki, 574–577 (1984).Google Scholar
  3. 3.
    W. Herz et al., Test of the European LCT-coil in the Karlsruhe test facility TOSKA, Proc. ICEC 10, Helsinki, 83–86 (1984).Google Scholar
  4. 4.
    W. Lehmann, Considerations on and experience with helium forced-flow-cooling techniques for superconducting fusion magnets, Proc. Cryogenics and Refrigeration Conf. Hangzhou, Int. Academic Publishers Pergamon, 319–327 (1989).Google Scholar
  5. 5.
    G. Zahn et al., Test of three different pumps for circulating He I and He II. Proc. ICEC 14, Kiev, 100–103(1992).Google Scholar
  6. 6.
    H. Berndt et al., Low loss liquid helium transfer systems, using a high performance centrifugal pump and cold gas exchange, Adv. Cryog. Eng., 33: 1147–1152 (1988).Google Scholar
  7. 7.
    H. Berndt et al., Two year’s experience in liquid helium transfer with a maintenance free centrifugal pump, Adv. Cryog Eng., 35B: 1039–1043 (1990).Google Scholar
  8. 8.
    B.A. Hands, V. Arp, R.D. McCarty, HEPROP-88: a computer code for helium properties, ICEC 12, 460–463(1988).Google Scholar

Copyright information

© Springer Science+Business Media New York 1994

Authors and Affiliations

  • Xu Cheng
    • 1
  • Wolfgang Lehmann
    • 1
  1. 1.Kernforschungszentrum Karlsruhe (KfK)Institut für Technische PhysikKarlsruheGermany

Personalised recommendations