Vibration isolation system for cryocoolers of soft x-ray spectrometer on-board ASTRO-H (Hitomi)

Yoh Takei, Susumu Yasuda, Kosei Ishimura, Naoko Iwata, Atsushi Okamoto, Yoichi Sato, Mina Ogawa, Makoto Sawada, Taro Kawano, Shingo Obara, Chikara Natsukari, Atsushi Wada, Shinya Yamada, Ryuichi Fujimoto, Motohide Kokubun, Noriko Y. Yamasaki, Hiroyuki Sugita, Kenji Minesugi, Yasuo Nakamura, Kazuhisa Mitsuda & 15 others Tadayuki Takahashi, Seiji Yoshida, Shoji Tsunematsu, Kenichi Kanao, Katsuhiro Narasaki, Kiyomi Otsuka, F. Scott Porter, Caroline A. Kilbourne, Meng P. Chiao, Megan E. Eckart, Gary A. Sneiderman, James T. Pontius, Dan McCammon, Paul Wilke, John Basile

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The 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 microvibration from cryocoolers mounted on the dewar. This is mitigated for the flight model (FM) by introducing vibration isolation systems between the cryocoolers and the dewar. The detector performance of the FM was verified before launch of the spacecraft in both ambient condition and thermal-vacuum condition, showing no detectable degradation in energy resolution. The in-orbit detector spectral performance and cryocooler cooling performance were 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 microvibration could degrade the cryogenic detector is shown. Lessons learned from the development to mitigate unexpected issues are also described.

Original languageEnglish
Article number011216
JournalJournal of Astronomical Telescopes, Instruments, and Systems
Volume4
Issue number1
DOIs
Publication statusPublished - 2018 Jan 1
Externally publishedYes

Fingerprint

x ray spectrometers
Dewars
Spectrometers
isolation
vibration
spectrometer
Detectors
X rays
flight
detectors
Cryogenics
energy
Spacecraft
lessons learned
Orbits
spacecraft
Vacuum
Cooling
cryogenics
cooling

Keywords

  • cryocooler
  • Hitomi
  • microcalorimeter
  • microvibration
  • soft x-ray spectrometer
  • vibration isolation

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Control and Systems Engineering
  • Instrumentation
  • Astronomy and Astrophysics
  • Mechanical Engineering
  • Space and Planetary Science

Cite this

Vibration isolation system for cryocoolers of soft x-ray spectrometer on-board ASTRO-H (Hitomi). / Takei, Yoh; Yasuda, Susumu; Ishimura, Kosei; Iwata, Naoko; Okamoto, Atsushi; Sato, Yoichi; Ogawa, Mina; Sawada, Makoto; Kawano, Taro; Obara, Shingo; Natsukari, Chikara; Wada, Atsushi; Yamada, Shinya; Fujimoto, Ryuichi; Kokubun, Motohide; Yamasaki, Noriko Y.; Sugita, Hiroyuki; Minesugi, Kenji; Nakamura, Yasuo; Mitsuda, Kazuhisa; Takahashi, Tadayuki; Yoshida, Seiji; Tsunematsu, Shoji; Kanao, Kenichi; Narasaki, Katsuhiro; Otsuka, Kiyomi; Scott Porter, F.; Kilbourne, Caroline A.; Chiao, Meng P.; Eckart, Megan E.; Sneiderman, Gary A.; Pontius, James T.; McCammon, Dan; Wilke, Paul; Basile, John.

In: Journal of Astronomical Telescopes, Instruments, and Systems, Vol. 4, No. 1, 011216, 01.01.2018.

Research output: Contribution to journalArticle

Takei, Y, Yasuda, S, Ishimura, K, Iwata, N, Okamoto, A, Sato, Y, Ogawa, M, Sawada, M, Kawano, T, Obara, S, Natsukari, C, Wada, A, Yamada, S, Fujimoto, R, Kokubun, M, Yamasaki, NY, Sugita, H, Minesugi, K, Nakamura, Y, Mitsuda, K, Takahashi, T, Yoshida, S, Tsunematsu, S, Kanao, K, Narasaki, K, Otsuka, K, Scott Porter, F, Kilbourne, CA, Chiao, MP, Eckart, ME, Sneiderman, GA, Pontius, JT, McCammon, D, Wilke, P & Basile, J 2018, 'Vibration isolation system for cryocoolers of soft x-ray spectrometer on-board ASTRO-H (Hitomi)', Journal of Astronomical Telescopes, Instruments, and Systems, vol. 4, no. 1, 011216. https://doi.org/10.1117/1.JATIS.4.1.011216
Takei, Yoh ; Yasuda, Susumu ; Ishimura, Kosei ; Iwata, Naoko ; Okamoto, Atsushi ; Sato, Yoichi ; Ogawa, Mina ; Sawada, Makoto ; Kawano, Taro ; Obara, Shingo ; Natsukari, Chikara ; Wada, Atsushi ; Yamada, Shinya ; Fujimoto, Ryuichi ; Kokubun, Motohide ; Yamasaki, Noriko Y. ; Sugita, Hiroyuki ; Minesugi, Kenji ; Nakamura, Yasuo ; Mitsuda, Kazuhisa ; Takahashi, Tadayuki ; Yoshida, Seiji ; Tsunematsu, Shoji ; Kanao, Kenichi ; Narasaki, Katsuhiro ; Otsuka, Kiyomi ; Scott Porter, F. ; Kilbourne, Caroline A. ; Chiao, Meng P. ; Eckart, Megan E. ; Sneiderman, Gary A. ; Pontius, James T. ; McCammon, Dan ; Wilke, Paul ; Basile, John. / Vibration isolation system for cryocoolers of soft x-ray spectrometer on-board ASTRO-H (Hitomi). In: Journal of Astronomical Telescopes, Instruments, and Systems. 2018 ; Vol. 4, No. 1.
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AU - Takei, Yoh

AU - Yasuda, Susumu

AU - Ishimura, Kosei

AU - Iwata, Naoko

AU - Okamoto, Atsushi

AU - Sato, Yoichi

AU - Ogawa, Mina

AU - Sawada, Makoto

AU - Kawano, Taro

AU - Obara, Shingo

AU - Natsukari, Chikara

AU - Wada, Atsushi

AU - Yamada, Shinya

AU - Fujimoto, Ryuichi

AU - Kokubun, Motohide

AU - Yamasaki, Noriko Y.

AU - Sugita, Hiroyuki

AU - Minesugi, Kenji

AU - Nakamura, Yasuo

AU - Mitsuda, Kazuhisa

AU - Takahashi, Tadayuki

AU - Yoshida, Seiji

AU - Tsunematsu, Shoji

AU - Kanao, Kenichi

AU - Narasaki, Katsuhiro

AU - Otsuka, Kiyomi

AU - Scott Porter, F.

AU - Kilbourne, Caroline A.

AU - Chiao, Meng P.

AU - Eckart, Megan E.

AU - Sneiderman, Gary A.

AU - Pontius, James T.

AU - McCammon, Dan

AU - Wilke, Paul

AU - Basile, John

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N2 - The 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 microvibration from cryocoolers mounted on the dewar. This is mitigated for the flight model (FM) by introducing vibration isolation systems between the cryocoolers and the dewar. The detector performance of the FM was verified before launch of the spacecraft in both ambient condition and thermal-vacuum condition, showing no detectable degradation in energy resolution. The in-orbit detector spectral performance and cryocooler cooling performance were 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 microvibration could degrade the cryogenic detector is shown. Lessons learned from the development to mitigate unexpected issues are also described.

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