11 July 2016 Vibration isolation system for cryocoolers of Soft X-ray Spectrometer (SXS) onboard ASTRO-H (Hitomi)
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Abstract
Soft X-ray Spectrometer (SXS) onboard ASTRO-H (named Hitomi after launch) is a microcalorimeter-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.
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Yoh Takei, Yoh Takei, Susumu Yasuda, Susumu Yasuda, Kosei Ishimura, Kosei Ishimura, Naoko Iwata, Naoko Iwata, Atsushi Okamoto, Atsushi Okamoto, Yoichi Sato, Yoichi Sato, Mina Ogawa, Mina Ogawa, Makoto Sawada, Makoto Sawada, Taro Kawano, Taro Kawano, Shingo Obara, Shingo Obara, Chikara Natsukari, Chikara Natsukari, Atsushi Wada, Atsushi Wada, Shinya Yamada, Shinya Yamada, Ryuichi Fujimoto, Ryuichi Fujimoto, Motohide Kokubun, Motohide Kokubun, Noriko Y. Yamasaki, Noriko Y. Yamasaki, Hiroyuki Sugita, Hiroyuki Sugita, Kenji Minesugi, Kenji Minesugi, Yasuo Nakamura, Yasuo Nakamura, Kazuhisa Mitsuda, Kazuhisa Mitsuda, Tadayuki Takahashi, Tadayuki Takahashi, Seiji Yoshida, Seiji Yoshida, Shoji Tsunematsu, Shoji Tsunematsu, Kenichi Kanao, Kenichi Kanao, Katsuhiro Narasaki, Katsuhiro Narasaki, Kiyomi Otsuka, Kiyomi Otsuka, Richard L. Kelley, Richard L. Kelley, F. Scott Porter, F. Scott Porter, Caroline A. Kilbourne, Caroline A. Kilbourne, Meng P. Chiao, Meng P. Chiao, Megan E. Eckart, Megan E. Eckart, Gary A. Sneiderman, Gary A. Sneiderman, James T. Pontius, James T. Pontius, Dan McCammon, Dan McCammon, Paul Wilke, Paul Wilke, John Basile, John Basile, "Vibration isolation system for cryocoolers of Soft X-ray Spectrometer (SXS) onboard ASTRO-H (Hitomi)", Proc. SPIE 9905, Space Telescopes and Instrumentation 2016: Ultraviolet to Gamma Ray, 99050X (11 July 2016); doi: 10.1117/12.2231832; https://doi.org/10.1117/12.2231832
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