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Tapered pulse tube for pulse tube refrigerators

United States Patent

September 21, 1999
View the Complete Patent at the US Patent & Trademark Office
Los Alamos National Laboratory - Visit the Technology Transfer Division Website
Thermal insulation of the pulse tube in a pulse-tube refrigerator is maintained by optimally varying the radius of the pulse tube to suppress convective heat loss from mass flux streaming in the pulse tube. A simple cone with an optimum taper angle will often provide sufficient improvement. Alternatively, the pulse tube radius r as a function of axial position x can be shaped with r(x) such that streaming is optimally suppressed at each x.
Swift; Gregory W. (Sante Fe, NM), Olson; Jeffrey R. (San Mateo, CA)
Regent of the University of California (Los Alamos, NM)
08/ 975,766
November 21, 1997
This invention was made with government support under Contract No. W-7405-ENG-36 awarded by the U.S. Department of Energy. The government has certain rights in the invention.