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Proceedings Paper

Cryogenic Limb Array Etalon Spectrometer (CLAES)1 S/N001 Cryostat Test Results
Author(s): W. J. Horsley; L. Naes
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Paper Abstract

The S/N001 Cryostat2 tested consists of the originally designed solid hydrogen configuration coupled with an instrument thermal mass simulator (ITMS) for simulating the thermal behavior of the instrument package. The test program was designed to verify the operational and thermal performance of the Cryostat/ITMS system as monitored and serviced by the Data Acquiisition System (DAS) and Ground Support Equipment (GSE). After the DAS and GSE passed functional performance tests, the Cryostat/ITMS was slowly pumped from ambient to 10 torr to minimize any possible damage to the structures and Multilayer Insulation (MLI). The system was then pumped to a hard vacuum and tested for vacuum integrity of all 0-ring seals. During this initial pumpdown phase of the test, it was found that better communication was needed between the various compartments of the vacuum space for efficient evacuation of the cryostat. These improvements have been implemented on this unit as well as on the subsequent Ne/CO2 Cryostat. Liquid Nitrogen flowing through the coolant lines was used to precool the Cryostat to slightly above 77 degress Kelvin, at which point the tank was filled with liquid Helium. The test data includes the rate of temperature decrease of the various parts of the Cryostat/ITMS and the final equilibrium temperatures of the shields, thermal links and tank. These temperatures as well as the boiloff rate of the liquid Helium were compared with the expected values as predicted by the thermal models developed in house. The liquid Helium was allowed to boil off and liquid Neon was introduced into the Cryostat. The Neon was solidified by first circulating liquid Helium through the coolant coils and maintained by pumping on the cooled Neon through the fill line. End of life temperature profiles across the tank were obtained and compared with predicted values. Additional temperature and heat rate values were obtained and compared with predictions. System warmup procedures were verified without problems. The overall test resulted in significant design improvements for the Ne/CO2 Cryostat.

Paper Details

Date Published: 27 April 1988
PDF: 8 pages
Proc. SPIE 0973, Cryogenic Optical Systems and Instruments III, (27 April 1988); doi: 10.1117/12.948384
Show Author Affiliations
W. J. Horsley, Lockheed Research & Development Laboratory (United States)
L. Naes, Lockheed Research & Development Laboratory (United States)

Published in SPIE Proceedings Vol. 0973:
Cryogenic Optical Systems and Instruments III
Ramsey K. Melugin; Warren G. Pierce, Editor(s)

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