1 October 1991 Imaging gas scintillation proportional counters for ASTRO-D
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Abstract
The design and performance of imaging gas scintillation proportional counters (IGSPCs) developed for ASTRO-D are described. The 10 micrometers beryllium window has enabled the x- ray sensitivity down to 0.7 keV for a sealed-off gas counter, and a position-sensitive phototube equipped with multiwire anode gives good imaging capability. The laboratory model of the IGSPC shows an energy resolution 8% FWHM at 6 keV and a position resolution 0.5 mm FWHM with an effective area of 50 mm diameter. The onboard data system incorporating a 16-bit microprocessor efficiently discriminates the room background down to the order of magnitude of 3 X 10-4 cm-2 s-1 keV-1, similar to that achieved by the Ginga LAC instrument. These performances make the GIS experiment a very powerful focal plane instrument for ASTRO-D.
© (1991) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Takaya Ohashi, Kazuo Makishima, Manabu Ishida, Takeshi G. Tsuru, Makoto Tashiro, Teruyoshi Mihara, Yoshiki Kohmura, Hiroyuki Inoue, "Imaging gas scintillation proportional counters for ASTRO-D", Proc. SPIE 1549, EUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy II, (1 October 1991); doi: 10.1117/12.48322; https://doi.org/10.1117/12.48322
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