Advertisement

A Novel Scheme to Handle Highly Pulsed Loads with a Standard Helium Refrigerator

  • Don Slack
Chapter
Part of the Advances in Cryogenic Engineering book series (ACRE, volume 39)

Abstract

Helium refrigerator performance degrades rapidly when it has to handle a varying or pulsed heat load. A novel scheme is presented to handle highly pulsed 4.5 K cryogenic loads with a standard helium refrigerator by isolating it from these pulses. The scheme uses a relatively simple arrangement of control valves, heat exchangers, and a storage dewar. Applications include pulsed tokamak machines such as TPX (Tokamak Physics Experiment) and ITER (International Thermonuclear Experimental Reactor). For example, the TPX (currently in the conceptual design phase in a DoE contract) requires an average 4.5 K refrigerator capacity of about 10 kW; however, pulsed loads caused by eddy current and nuclear heating will exceed 100 kW. The scheme presented here provides a method for handling these pulsed loads. Because of the simple and proven nature of the components involved and the thermodynamic properties of the helium, the system could be implemented for projects such as TPX or ITER with little or no development.

Keywords

Heat Exchanger Lawrence Livermore National Laboratory International Thermonuclear Experimental Reactor Pulse Load Condense Heat Transfer 
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.V. Hassenzahl, T. O’Connor, “TPX Toroidal Field System Design Description,” Lawrence Livermore National Laboratory Report UCRL-AR-113958, Livermore, CA (1993).Google Scholar
  2. 2.
    D.S. Slack, “TPX Tokamak Physics Experiment, System Design Description, Cryogenic System, ” TPX Report 72–930319-LLNL/DSlack-01, Princeton Plasma Physics Laboratory, Princeton, NJ (1993)Google Scholar
  3. 3.
    H. Luck, Ch. Trepp, Thermoacoustic Oscillations in Cryogenics, Part 3: Avoiding and Damping of Oscillations, Cryogenics Vol. 32, No. 8, pp. 703–706 (1992).CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media New York 1994

Authors and Affiliations

  • Don Slack
    • 1
  1. 1.Lawrence Livermore National LaboratoryUniversity of CaliforniaLivermoreUSA

Personalised recommendations