Soft x-ray spectrometer (SXS): the high-resolution cryogenic spectrometer onboard ASTRO-H

摘要

We present the development status of the Soft X-ray Spectrometer (SXS) onboard the ASTRO-H mission. The SXS provides the capability of high energy-resolution X-ray spectroscopy of a FWHM energy resolution of ＜ 7eV in the energy range of 0.3 - 10 keV. It utilizes an X-ray micorcalorimeter array operated at 50 mK. The SXS microcalorimeter subsystem is being developed in an EM-FM approach. The EM SXS cryostat was developed and fully tested and, although the design was generally con rmed, several anomalies and problems were found. Among them is the interference of the detector with the micro-vibrations from the mechanical coolers, which is the most di cult one to solve. We have pursued three di erent countermeasures and two of them seem to be e ective. So far we have obtained energy resolutions satisfying the requirement with the FM cryostat.