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1 November 1990 Supercritical helium dewar for the Infrared Background Signature Survey experiment
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A superfluid helium dewar design for operation under supercritical conditions is described. The dewar consists of a 300 1 volume cylinder toroidal tank suspended from the vacuum shell by preloaded GFC chains. Three ventgas cooled radiation shields surround the tank. The optics is mounted to a flange at the He tank being conductively cooled. The optics temperature is allowed to float with the tank temperature going from 4.8 to 10 K while holding the tank pressure constant at 2.8 bar. The focal planes of the IR sensor are actively heated and held at a constant temperature of 10.5 and 14.2 K.
© (1990) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Gunther Pulkert, Guenter Lange, H. Lieb, and Albert Seidel "Supercritical helium dewar for the Infrared Background Signature Survey experiment", Proc. SPIE 1340, Cryogenic Optical Systems and Instruments IV, (1 November 1990);

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