Multi-stage pulse tube cryocooler with acoustic impedance constructed to reduce transient cool down time and thermal loss
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United States of America Patent
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Oct 21, 2008
Grant Date -
Sep 25, 2008
app pub date -
Aug 23, 2005
filing date -
Aug 23, 2005
priority date (Note) -
Expired
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Abstract
The cool down time for a multi-stage, pulse tube cryocooler is reduced by configuring at least a portion of the acoustic impedance of a selected stage, higher than the first stage, so that it surrounds the cold head of the selected stage. The surrounding acoustic impedance of the selected stage is mounted in thermally conductive connection to the warm region of the selected stage for cooling the acoustic impedance and is fabricated of a high thermal diffusivity, low thermal radiation emissivity material, preferably aluminum.
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