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Proceedings Paper

The Cryogenic Subsystem For The X-Ray Spectrometer On The Advanced X-Ray Astrophysics Facility (AXAF)
Author(s): Stephen H Castles; Susan R Breon; Brent A. Warner; Aristides T. Serlemitsos; Stephen M Volz; Linda A Owens; Michael G. Ryschkewitsch
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Paper Abstract

The X-Ray Spectrometer (XRS) instrument on the Advanced X-Ray Astrophysics Facility (AXAF) will use X-ray detectors that operate at 0.1 K. The detectors will be maintained at 0.1 K by an Adiabatic Demagnetization Refrigerator (ADR) that operates inside a liquid helium dewar. The ADR rejects approximately 2 mW of heat to the stored liquid helium. With this low instrument heat load, the liquid helium dewar will have a long lifetime if the parasitic heat load on the helium from the surrounding, warm facility is minimized. Spaceborne helium dewars typically use up to 3 vapor cooled shields to intercept the parasitic heat load. The XRS will add mechanical coolers to provide additional cooling to the outer vapor cooled shield. The cryogenic system consists of an ADR, a liquid helium dewar, mechanical coolers, and a thermal strap to connect the coolers to the dewar. The lifetime of the stored cryogen is calculated to be up to 5 years. This cryogenic system is described, with particular attention given to the dewar, mechanical cooler, and ADR design, testing, and trade studies. A breadboard ADR is presently being fabricated and tested. The status of the construction and testing of this breadboard will be described.

Paper Details

Date Published: 27 April 1988
PDF: 7 pages
Proc. SPIE 0973, Cryogenic Optical Systems and Instruments III, (27 April 1988); doi: 10.1117/12.948349
Show Author Affiliations
Stephen H Castles, NASA/Goddard Space Flight Center (United States)
Susan R Breon, NASA/Goddard Space Flight Center (United States)
Brent A. Warner, NASA/Goddard Space Flight Center (United States)
Aristides T. Serlemitsos, NASA/Goddard Soace Flight Center (United States)
Stephen M Volz, NASA/Goddard Space Flight Center (United States)
Linda A Owens, NASA/Goddard Space Flight Center (United States)
Michael G. Ryschkewitsch, NASA/Goddard Space Flight Center (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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