The AXAF/XRS test dewar - A versatile designThe X-Ray Spectrometer (XRS) to be flown on the Advanced X-ray Astrophysics Facility (AXAF) consists of an array of microcalorimeters and an Adiabatic Demagnetization Refrigerator (ADR). The ADR provides an operating temperature of 0.065 to 0.100 K. To support extensive development testing of the ADR and the detector array, a test dewar has been designed and built that surpasses specification requirements. Pumping on the liquid helium bath with a 47 l/s pump, we have achieved temperatures lower than 1.5 K with a hold time in excess of 72 hrs. The dewar can be operated without liquid nitrogen with a hold time of 36 hrs. This feature was incorporated in the design because boiling nitrogen may introduce microphonic noise to the detectors. To further reduce the susceptibility to microphonic vibration a unique suspension system utilizing Kevlar fibers was devised which provides both translational and rotational rigidity to the detector mount. Finally, the dewar is very manageable and may be rotated by only one person.
Document ID
19930064657
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Weintz, Karl F. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Serlemitsos, Aristides T. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Sansebastian, Marcelino (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Kunes, Evan S. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1991
Publication Information
Publication: In: Advances in cryogenic engineering. Vol. 37B - Proceedings of the 1991 Cryogenic Engineering Conference, Univ. of Alabama, Huntsville, June 11-14, 1991 (A93-48578 20-37)
Publisher: Plenum Press
Subject Category
Engineering (General)
Accession Number
93A48654
Distribution Limits
Public
Copyright
Other
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Related Records
IDRelationTitle19930064581Collected WorksAdvances in cryogenic engineering. Vols. 37A & 37B - Proceedings of the 1991 Cryogenic Engineering Conference, Univ. of Alabama, Huntsville, June 11-14, 1991