Abstract
The soft x-ray spectrometer (SXS) on-board Astro-H presents to the science community unprecedented capability (<7 eV full width half max at 6 keV) for high-resolution spectral measurements in the range of 0.5 to 12 keV to study extended celestial sources. At the heart of the SXS is the x-ray calorimeter spectrometer (XCS) where detectors (calorimeter array and anticoincidence detector) operate at 50 mK, the bias circuit operates at nominal 1.3 K, and the first stage amplifiers operate at 130 K, all within a nominal 20-cm envelope. The design of the detector assembly (DA) in the XCS originates from the Astro-E x-ray spectrometer (XRS) and lessons learned from Astro-E and Suzaku. After the production of our engineering model, additional changes were made to improve our flight assembly process for better reliability and overall performance. We present the final design and implementation of the flight DA, compare its parameters and performance with Suzaku’s XRS, and list susceptibilities to other subsystems as well as our lessons learned.
Highlights
Hitomi, known as Astro-H, was launched successfully on February 17, 2016, from the Japan Aerospace Exploration Agency (JAXA) Tanegashima Space Center and had excellent performance during the instrument commissioning phase.NASA provided the calorimeter spectrometer insert (CSI) and worked closely with Sumitomo Heavy Industry (SHI) Quantum Group Niihama division and JAXA on integration into the flight dewar in the SHI cleanroom facility
Various aspects of the soft x-ray spectrometer (SXS) such as in-orbit performance and other subsystems including the dewar will be described in detail elsewhere in this proceeding.[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17]
The calorimeter array is the eye of the x-ray calorimeter spectrometer (XCS), and the calorimeter thermal sink (CTS) provides a mechanical and thermal enclosure with shielded passageways for electrical power and signals
Summary
Known as Astro-H, was launched successfully on February 17, 2016, from the Japan Aerospace Exploration Agency (JAXA) Tanegashima Space Center and had excellent performance during the instrument commissioning phase. The x-ray amplifier box (XBOX) and the DS together complete the analog circuits Both the calorimeter and the anticoincidence detectors use JFETs as the first stage amplifier. The calorimeter array is the eye of the x-ray calorimeter spectrometer (XCS), and the CTS provides a mechanical and thermal enclosure with shielded passageways for electrical power and signals.
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