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A variable conductance gas switch for intermediate temperature operation of liquid He/liquid N2 cryostatsA technique for establishing a stable intermediate temperature stage in liquid He/liquid N2 double vessel cryostats is described. The tertiary cold stage, which can be tuned to any temperature between 10 and 60 K, is ideal for cooling IR sensors for use in astronomy and physics applications. The device is called a variable-conductance gas switch. It is essentially a small chamber, located between the cold stage and liquid helium cold-face, whose thermal conductance may be controlled by varying the pressure of helium gas within the chamber. A key feature of this device is the large range of temperature control achieved with a very small (less than 10 mW) heat input from the cryogenic temperature control switch.
Document ID
19880037106
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Rayner, J. T.
(Edinburgh, University United Kingdom)
Chuter, T. C.
(Edinburgh Univ. United Kingdom)
Mclean, I. S.
(Royal Observatory Edinburgh, United Kingdom)
Radostitz, J. V.
(Edinburgh Univ. United Kingdom)
Nolt, I. G.
(NASA Langley Research Center Hampton, VA, United States)
Date Acquired
August 13, 2013
Publication Date
January 1, 1988
Publication Information
Publication: Infrared Physics
Volume: 28
ISSN: 0020-0891
Subject Category
Engineering (General)
Accession Number
88A24333
Distribution Limits
Public
Copyright
Other

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