XRS system - the first cryogenic X-ray detector in orbit

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Inst. Space and Astronautical Sci., Sagamihara, 229-8150, Japan ^{[1
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Nucl Instrum Methods Phys Res Sect A | / 1-2卷 / 212-217期

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The X-ray Spectrometer; XRS; is a unique instrument on board ASTRO-E; the fifth Japanese X-ray astrophysics mission [1; which will be put in orbit in early 2000. The XRS utilizes an X-ray microcalorimeter array operating at a cryogenic temperature of 60 mK and achieves a spectral resolution of about 12 eV (FWHM) and a high quantum efficiency of 20–80% in the 0.5–12 keV energy band. A unique three-stage cryogenic system is employed in order to obtain 60 mK and a cryogenic life time of about 2 yr. The XRS is developed by international collaboration supported by Institute of Space and Astronautical Science (ISAS) and National Aeronautics and Space Administration (NASA);

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