Skip to Content
Find More Like This
Return to Search

Tapered pulse tube for pulse tube refrigerators

United States Patent

5,953,920
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.