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Cryogen requirements for on-orbit cool-down and replenishment of SIRTF

✍ Scribed by D. Frank

Publisher: Elsevier Science
Year: 1986
Tongue: English
Weight: 437 KB
Volume: 26
Category: Article
ISSN: 0011-2275
DOI: 10.1016/0011-2275(86)90014-7

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✦ Synopsis

It is expected that once the Space Infrared Telescope Facility (SIRTF) is serviced on-orbit it may have to be cooled down to its operating temperature to perform an efficient fill of the cryogens. An on-orbit cool-down can become necessary if a warm change-out of some cryogenic instruments is required or if uncertainties in the lifetime lead to a premature depletion of the cryogens, Restrictions in on-orbit cryogen top-off (refilling of a tank not yet depleted) opportunities (orbital logistics) may also lead to cryogen depletion. The objective of the tank/telescope cool-down study is to determine the time lines, required amounts of cryogens and transfer rates to perform the cooldown on orbit This study focusses on a 4000 dm 3 all-helium system.

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