JAXA’s X-ray Astronomy Mission ASTRO-H: Launch and First Month’s In-Orbit Thermal Performance

Date

2016-07-10

Journal Title

Journal ISSN

Volume Title

Publisher

46th International Conference on Environmental Systems

Abstract

In this study, the thermal performance evaluation results of JAXA’s next major X-ray astronomy mission ASTRO-H are presented. ASTRO-H will be launched in early 2016 using an H2A rocket from Tanegashima Space Center. Final integration tests, including a system thermal vacuum test (TVT) with a flight model (FM), have been conducted in Tsukuba for approximately one year. The thermal design has been finally verified, and the thermal mathematical model has been correlated by TVT. Because any attitude is taken within the sun angle of 30°, as determined from the limitation of sunlight incidence angles on telescopes, we performed thermal analysis of more than 40 cases, including worst hot and cold cases, and contingencies. Thermal control systems were verified to work in all analysis cases. The ASTRO-H FM will be shipped to Tanegashima after it passes the post-qualification review. ASTRO-H houses four telescopes and six detectors. Each detector has its own radiator and heat pipes for heat dissipation. The most major mission will include the soft X-ray spectrometer, which has four loop heat pipes for heat transport from two cryocoolers. In addition, a fan is mounted close to each cryocooler for ground cooling in the fairing just before the launch. Hard X-ray imagers (HXIs) are mounted on the HXI plate that is expanded by 6.4 m using an extensible optical bench in orbit to achieve the necessary focal length. The thermal performance before the launch and post flight will be evaluated and reported.

Description

Japan
Japan Aerospace Exploration Agency
NEC corporation
NEC Corporation
NEC Corpotaion
JAXA/ISAS
202
ICES202: Satellite, Payload, and Instrument Thermal Control
Vienna, Austria
Naoko IWATA
Takashi USUI
Akihiko MIKI
Mizuho IKEDA
Naoko IWATA, Japan Aerospace Exploration Agency, Japan
Takashi USUI, NEC Corporation, Japan
Akihiko MIKI, NEC Corporation, Japan
Mizuho IKEDA, NEC Corporation, Japan
The 46th International Conference on Environmental Systems was held in Vienna, Austria, USA on 10 July 2016 through 14 July 2016.
Yoh TAKEI, Japan Aerospace Exploration Agency, Japan
Atsushi OKAMOTO, Japan Aerospace Exploration Agency, Japan
Hiroyuki OGAWA, Japan Aerospace Exploration Agency, Japan
Tadayuki TAKAHASHI, Japan Aerospace Exploration Agency, Japan
The 46th International Conference on Environmental Systems was held in Vienna, Austria, USA on 10 July 2016 through 14 July 2016.

Keywords

X-ray astronomy satellite, In-orbit thermal performance, Launch, Heat pipe, Loop heat pipe

Citation