22 October 1999 Detector assembly and the ultralow-temperature refrigerator for XRS
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Abstract
The x-ray spectrometer (XRS) on the Japanese Astro-E observatory is the first ultra low temperature space borne instrument. The system utilizes a 900g ferric ammonium alum adiabatic demagnetization refrigerator (ADR) with 3He gas gap heat switch to cool the detector assembly to 0.060 K. The system operates in a 'single shot' configuration allowing the system to remain at its operating temperature for about 40 hours in the lab before executing a recharge cycle. The on-orbit performance is expected to be about 36 hours with a 97 percent duty cycle. The detector assembly for XRS consists of a 32 channel microcalorimeter array, bias electronics, thermometry, and an anti-coincidence detector that are attached to the cold stage of the ADR. To thermally isolate the detector system from the superfluid helium reservoir, the detector system is suspended by Kevlar cords and electrical connection is made by 130, 20 micron diameter, tensioned NbTi leads. The detectors are read out in a source-follower arrangement using FET amplifiers operating at 130 K mounted in nested, thermally-isolated assemblies that also use Kevlar suspension and stainless steel wiring. The design and thermal performance of this system will be discussed.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Frederick Scott Porter, Frederick Scott Porter, Michael Damian Audley, Michael Damian Audley, Regis P. Brekosky, Regis P. Brekosky, Rebecca J. Derro, Rebecca J. Derro, Michael J. DiPirro, Michael J. DiPirro, Keith C. Gendreau, Keith C. Gendreau, John D. Gygax, John D. Gygax, Richard L. Kelley, Richard L. Kelley, Dan McCammon, Dan McCammon, Armando Morrell, Armando Morrell, Scott D. Murphy, Scott D. Murphy, Robert J. Paulos, Robert J. Paulos, Thai Pham, Thai Pham, Caroline Kilbourn Stahle, Caroline Kilbourn Stahle, Andrew E. Szymkowiak, Andrew E. Szymkowiak, James G. Tuttle, James G. Tuttle, } "Detector assembly and the ultralow-temperature refrigerator for XRS", Proc. SPIE 3765, EUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy X, (22 October 1999); doi: 10.1117/12.366556; https://doi.org/10.1117/12.366556
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