The detector subsystem for the SXS instrument on the ASTRO-H Observatory
The detector subsystem for the SXS instrument on the ASTRO-H Observatory
复制标题
ASTRO-H 天文台 SXS 仪器的探测器子系统
DOI：
--
复制
发表时间：
2010
期刊：
影响因子：
--
通讯作者：
N. Yamasaki
中科院分区：
文献类型：
--
作者：
F. Porter;J. Adams;G. V. Brown;J. Chervenak;M. Chiao;R. Fujimoto;Y. Ishisaki;R. Kelley;C. Kilbourne;D. McCammon;K. Mitsuda;T. Ohashi;A. Szymkowiak;Y. Takei;M. Tashiro;N. Yamasaki
Astro-H 天文台上的软 X 射线光谱仪 (SXS) 仪器基于在精密航天低温恒温器中冷却至 50 mK 的 36 像素 X 射线量热仪阵列。 SXS 是一款真正的空间光谱仪器，其中每个空间离散像素都充当高分辨率光谱仪。在这里，我们讨论 SXS 探测器子系统，包括探测器阵列、反符合探测器、第一级放大器、探测器的热和机械分级以及低温偏置电子器件。 SXS 探测器子系统的设计继承了 Suzaku/XRS 仪器的重要传统，但进行了一些重要的修改，以提高性能裕度并简化焦平面组件。显着的改进包括热容量显着降低的 X 射线吸收器、改进的负载电阻、改进的测温以及降低对热辐射的敏感度。这些修改为实验室中的代表性设备在 6 keV 下产生了 3.5-4.0 eV FWHM 的能量分辨率，为 7 eV 仪器要求提供了相当大的余量。我们预计飞行中会有类似的表现。
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.