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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Marland, B., Bugby, D., Stouffer, C., “Development and Testing of Advanced Cryogenic Thermal Switch Concepts,” Space Technology and Applications International Forum (STAIF-00), M. El-Genk editor, AIP Conference Proceedings No. 504, Albuquerque, NM, 2000.
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© 2002 Kluwer Academic Publishers
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Marland, B., Bugby, D., Stouffer, C., Tomlinson, B., Davis, T. (2002). Development and Testing of a High Performance Cryogenic Thermal Switch. In: Ross, R.G. (eds) Cryocoolers 11. Springer, Boston, MA. https://doi.org/10.1007/0-306-47112-4_89
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DOI: https://doi.org/10.1007/0-306-47112-4_89
Publisher Name: Springer, Boston, MA
Print ISBN: 978-0-306-46567-3
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