Abstract This paper presents development details and performance test results of a high performance cryogenic thermal switch (CTSW) for coupling redundant cryocoolers to cryogenic components with minimal off-cooler parasitics. Because gas-gap, hydride-pumped CTSW designs have not reliably met performance goals of an “on” resistance less than 2 K/W and an “off” resistance greater than 1000 K/W, a simpler, more reliable device was sought. The device that was developed is based on the reversible and highly reliable physical process of differential thermal contraction/expansion of stainless steel relative to beryllium. The 250 gram Swales differential coefficient of thermal expansion (CTE) CTSW (or SDCC) has just 3 machined parts: two cylindrical beryllium discs (same diameter, different lengths) and a thin-walled stainless steel tube. In ground testing, the SDCC demonstrated an “off” resistance of 1400 K/W and an “on” resistance of 1.2–2.0 K/W over a cold end temperature range of 25–50 K and a warm end temperature range of 230–300 K. Other issues addressed in the paper include alternative gas-gap (non hydride-pumped) designs, the option of “cross-strapping” and CTSW reliability. Finally, an advanced SDCC design is also briefly described that can reduce CTSW mass to just 50 grams with virtually no (surface area-induced) parasitic heat input into the cryogenic system.


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    Title :

    Development and Testing of a High Performance Cryogenic Thermal Switch


    Contributors:
    Marland, B. (author) / Bugby, D. (author) / Stouffer, C. (author) / Tomlinson, B. (author) / Davis, T. (author)

    Published in:

    Publication date :

    2002-01-01


    Size :

    10 pages




    Type of media :

    Article/Chapter (Book)


    Type of material :

    Electronic Resource


    Language :

    English




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