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- W2089200311 abstract "A thermal heat switch has been developed intended for cryogenic space applications operating around 100 K. The switch was designed to separate two pulse tube cold heads that cool a common focal plane array. Two cold heads are used for redundancy reasons, while the switch is used to reduce the thermal heat loss of the stand-by cold head, thus limiting the required input power, weight and dimensions of the cooler assembly. After initial evaluation of possible switching technologies, a construction based on the thermal expansion coefficient (CTE) of different materials was chosen. A simple design is proposed based on thermoplasts which have one of the highest CTE known permitting a relative large gap width in the open state. Furthermore, the switch requires no power neither during normal operation nor for switching. This enhances reliability and allows for a simple mechanical design. After a single switch was successfully built, a second doubleswitch configuration was designed and tested. The long term performance of the chosen thermoplast (ultra-high molecular weight polyethylene) under cryogenic load is also analysed." @default.
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- W2089200311 date "2014-01-01" @default.
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- W2089200311 title "A compact thermal heat switch for cryogenic space applications operating near 100K" @default.
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- W2089200311 doi "https://doi.org/10.1016/j.cryogenics.2013.11.004" @default.
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