18 July 2016 Performance of the helium dewar and cryocoolers of ASTRO-H SXS
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Abstract
The Soft X-ray Spectrometer (SXS) is a cryogenic high-resolution X-ray spectrometer onboard the ASTRO-H satellite, that achieves energy resolution better than 7 eV at 6 keV, by operating the detector array at 50 mK using an adiabatic demagnetization refrigerator. The cooling chain from room temperature to the ADR heat sink is composed of 2-stage Stirling cryocoolers, a 4He Joule-Thomson cryocooler, and super uid liquid He, and is installed in a dewar. It is designed to achieve a helium lifetime of more than 3 years with a minimum of 30 liters. The satellite was launched on 2016 February 17, and the SXS worked perfectly in orbit, until March 26 when the satellite lost its function. It was demonstrated that the heat load on the He tank was about 0.7 mW, which would have satisfied the lifetime requirement. This paper describes the design, results of ground performance tests, prelaunch operations, and initial operation and performance in orbit of the flight dewar and cryocoolers.
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Ryuichi Fujimoto, Ryuichi Fujimoto, Yoh Takei, Yoh Takei, Kazuhisa Mitsuda, Kazuhisa Mitsuda, Noriko Y. Yamasaki, Noriko Y. Yamasaki, Masahiro Tsujimoto, Masahiro Tsujimoto, Shu Koyama, Shu Koyama, Kumi Ishikawa, Kumi Ishikawa, Hiroyuki Sugita, Hiroyuki Sugita, Yoichi Sato, Yoichi Sato, Keisuke Shinozaki, Keisuke Shinozaki, Atsushi Okamoto, Atsushi Okamoto, Shunji Kitamoto, Shunji Kitamoto, Akio Hoshino, Akio Hoshino, Kosuke Sato, Kosuke Sato, Yuichiro Ezoe, Yuichiro Ezoe, Yoshitaka Ishisaki, Yoshitaka Ishisaki, Shinya Yamada, Shinya Yamada, Hiromi Seta, Hiromi Seta, Takaya Ohashi, Takaya Ohashi, Toru Tamagawa, Toru Tamagawa, Hirofumi Noda, Hirofumi Noda, Makoto Sawada, Makoto Sawada, Makoto Tashiro, Makoto Tashiro, Yoichi Yatsu, Yoichi Yatsu, Ikuyuki Mitsuishi, Ikuyuki Mitsuishi, Kenichi Kanao, Kenichi Kanao, Seiji Yoshida, Seiji Yoshida, Mikio Miyaoka, Mikio Miyaoka, Shoji Tsunematsu, Shoji Tsunematsu, Kiyomi Otsuka, Kiyomi Otsuka, Katsuhiro Narasaki, Katsuhiro Narasaki, Michael J. DiPirro, Michael J. DiPirro, Peter J. Shirron, Peter J. Shirron, Gary A. Sneiderman, Gary A. Sneiderman, Caroline A. Kilbourne, Caroline A. Kilbourne, F. Scott Porter, F. Scott Porter, Meng P. Chiao, Meng P. Chiao, Megan E. Eckart, Megan E. Eckart, Richard L. Kelley, Richard L. Kelley, "Performance of the helium dewar and cryocoolers of ASTRO-H SXS", Proc. SPIE 9905, Space Telescopes and Instrumentation 2016: Ultraviolet to Gamma Ray, 99053S (18 July 2016); doi: 10.1117/12.2232933; https://doi.org/10.1117/12.2232933
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