Thermal analyses for initial operations of the Soft X-Ray Spectrometer (SXS) onboard ASTRO-H

Hirofumi Noda, Kazuhisa Mitsuda, Atsushi Okamoto, Yuichiro Ezoe, Kumi Ishikawa, Ryuichi Fujimoto, Noriko Yamasaki, Yoh Takei, Takaya Ohashi, Yoshitaka Ishisaki, Ikuyuki Mitsuishi, Seiji Yoshida, Michael DiPirro, Peter Shirron

研究成果: Conference contribution

12 被引用数 (Scopus)

抄録

The Soft X-ray Spectrometer (SXS) onboard ASTRO-H (Hitomi) achieved a high energy resolution of ∼ 4.9 eV at 6 keV with an X-ray microcalorimeter array kept at 50 mK in the orbit. The cooling system utilizes liquid helium, and a porous plug phase separator is utilized to confine it. Therefore, it is required to keep the helium temperature always lower than the λ point of 2.17 K in the orbit. To clarify the maximum allowable helium temperature at the launch also considering the uncertainties of the initial operation in the orbit, we constructed a thermal mathematical model of the SXS dewar which properly implements the helium mass flow rate through the porous plug, and carried out time-series thermal simulations. Based on the results, the maximum allowable helium temperature at the launch was set at 1.7 K. We also conducted a transient thermal calculation using the actual temperatures at the launch as initial conditions. As a result, the helium mass flow rate when the helium temperature was in equilibrium is estimated to be 34-42 μg/s, and the life time of the helium mode is predicted to be ∼ 3.9-4.7 years. The present paper reports model structures, simulation results, and the comparisons with temperatures measured in the orbit.

本文言語English
ホスト出版物のタイトルSpace Telescopes and Instrumentation 2016
ホスト出版物のサブタイトルUltraviolet to Gamma Ray
編集者Marshall Bautz, Tadayuki Takahashi, Jan-Willem A. den Herder
出版社SPIE
ISBN(電子版)9781510601895
DOI
出版ステータスPublished - 2016
イベントSpace Telescopes and Instrumentation 2016: Ultraviolet to Gamma Ray - Edinburgh, United Kingdom
継続期間: 2016 6 262016 7 1

出版物シリーズ

名前Proceedings of SPIE - The International Society for Optical Engineering
9905
ISSN(印刷版)0277-786X
ISSN(電子版)1996-756X

Other

OtherSpace Telescopes and Instrumentation 2016: Ultraviolet to Gamma Ray
国/地域United Kingdom
CityEdinburgh
Period16/6/2616/7/1

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学
  • コンピュータ サイエンスの応用
  • 応用数学
  • 電子工学および電気工学

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