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Proceedings Paper

The detector subsystem for the SXS instrument on the ASTRO-H Observatory
Author(s): F. S. Porter; J. S. Adams; G. V. Brown; J. A. Chervenak; M. P. Chiao; R. Fujimoto; Y. Ishisaki; R. L. Kelley; C. A. Kilbourne; D. McCammon; K. Mitsuda; T. Ohashi; A. E. Szymkowiak; Y. Takei; M. Tashiro; N. Yamasaki
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Paper Abstract

The Soft X-ray Spectrometer (SXS) instrument on the Astro-H observatory is based on a 36 pixel x-ray calorimeter array cooled to 50 mK in a sophisticated spaceflight cryostat. The SXS is a true spatial-spectral instrument, where each spatially discrete pixel functions as a high-resolution spectrometer. Here we discuss the SXS detector subsystem that includes the detector array, the anticoincidence detector, the first stage amplifiers, the thermal and mechanical staging of the detector, and the cryogenic bias electronics. The design of the SXS detector subsystem has significant heritage from the Suzaku/XRS instrument but has some important modifications that increase performance margins and simplify the focal plane assembly. Notable improvements include x-ray absorbers with significantly lower heat capacity, improved load resistors, improved thermometry, and a decreased sensitivity to thermal radiation. These modifications have yielded an energy resolution of 3.5-4.0 eV FWHM at 6 keV for representative devices in the laboratory, giving considerable margin against the 7 eV instrument requirement. We expect similar performance in flight.

Paper Details

Date Published: 9 August 2010
PDF: 13 pages
Proc. SPIE 7732, Space Telescopes and Instrumentation 2010: Ultraviolet to Gamma Ray, 77323J (9 August 2010); doi: 10.1117/12.857888
Show Author Affiliations
F. S. Porter, NASA Goddard Space Flight Ctr. (United States)
J. S. Adams, NASA Goddard Space Flight Ctr. (United States)
G. V. Brown, Lawrence Livermore National Lab. (United States)
J. A. Chervenak, NASA Goddard Space Flight Ctr. (United States)
M. P. Chiao, NASA Goddard Space Flight Ctr. (United States)
R. Fujimoto, Kanazawa Univ. (Japan)
Y. Ishisaki, Tokyo Metropolitan Univ. (Japan)
R. L. Kelley, NASA Goddard Space Flight Ctr. (United States)
C. A. Kilbourne, NASA Goddard Space Flight Ctr. (United States)
D. McCammon, Univ. of Wisconsin-Madison (United States)
K. Mitsuda, Japan Aerospace Exploration Agency (Japan)
T. Ohashi, Tokyo Metropolitan Univ. (Japan)
A. E. Szymkowiak, Yale Univ. (United States)
Y. Takei, Japan Aerospace Exploration Agency (Japan)
M. Tashiro, Saitama Univ. (Japan)
N. Yamasaki, Japan Aerospace Exploration Agency (Japan)

Published in SPIE Proceedings Vol. 7732:
Space Telescopes and Instrumentation 2010: Ultraviolet to Gamma Ray
Monique Arnaud; Stephen S. Murray; Tadayuki Takahashi, Editor(s)

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