Soft X-ray Spectrometer (SXS) onboard ASTRO-H (named Hitomi after launch) is a micro-calorimeter-type spectrometer, installed in a dewar to be cooled at 50 mK. The energy resolution of the SXS engineering model suffered from micro-vibration from cryocoolers mounted on the dewar. This is mitigated for the flight model by introducing vibration isolation systems between the cryocoolers and the dewar. The detector performance of the flight model was verified before launch of the spacecraft in both ambient condition and thermal-vac condition, showing no detectable degradation in energy resolution. The in-orbit performance was also consistent with that on ground, indicating that the cryocoolers were not damaged by launch environment. The design and performance of the vibration isolation system along with the mechanism of how the micro-vibration could degrade the cryogenic detector is shown.
Vibration Isolation System for Cryocoolers of Soft X-Ray Spectrometer (SXS) Onboard ASTRO-H (Hitomi)
Space Telescopes and Instrumentation 2016: Ultraviolet to Gamma Ray ; 2016 ; Edinburgh, United Kingdom
SPIE Proceedings ; 9905
2016-07-11
Conference paper
No indication
English
On Orbit Structural Performance of Hitomi (ASTRO-H)
AIAA | 2019
|Thermally Conductive Vibration Isolation System for Cryocoolers
British Library Conference Proceedings | 2001
|Thermally Conductive Vibration Isolation System for Cryocoolers
Springer Verlag | 2002
|Infrared Camera Onboard ASTRO-F
British Library Conference Proceedings | 2002
|