Structural, thermal, and optical stability of the JASMINE telescope system

Naoki Isobe; Shingo Kashima; Yoshinori Suematsu; Naoteru Gouda; Ryohei Kano; Hirokazu Kataza; Hajime Kawahara; Naoki Kohara; Iona Kondo; Ichiro Mase; Ryou Ohsawa; Toshihiro Tsuzuki; Fumihiko Usui; Shin Utsunomiya; Takehiko Wada; Yoshiyuki Yamada; Taihei Yano; Aoi Takahashi; Tomoya Hattori; Koichi Takeda; Yukina Arima

doi:10.1117/12.3017299

23 August 2024 Structural, thermal, and optical stability of the JASMINE telescope system

Naoki Isobe, Shingo Kashima, Yoshinori Suematsu, Naoteru Gouda, Ryohei Kano, Hirokazu Kataza, Hajime Kawahara, Naoki Kohara, Iona Kondo, Ichiro Mase, Ryou Ohsawa, Toshihiro Tsuzuki, Fumihiko Usui, Shin Utsunomiya, Takehiko Wada, Yoshiyuki Yamada, Taihei Yano, Aoi Takahashi, Tomoya Hattori, Koichi Takeda, Yukina Arima

Author Affiliations +

Proceedings Volume 13092, Space Telescopes and Instrumentation 2024: Optical, Infrared, and Millimeter Wave; 1309236 (2024) https://doi.org/10.1117/12.3017299
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

Structural, Thermal and Optical Performance (STOP) analysis is performed to investigate the stability of the telescope to be onboard the Japan Astrometry Satellite Mission for INfrared Exploration (JASMINE). In order to perform one of the prime science objectives, high-precision astrometric observations in the wavelength range of 1.0–1.6 µm toward the Galactic center to reveal its central core structure and formation history, the JASMINE telescope is requested to be highly stable with an orbital change in the image distortion pattern being less than a few 10 µas after low-order correction. The JASMINE telescope tried to satisfy this requirement by adopting two design concepts. Firstly, the mirror and their support structures are made of extremely low coefficientof-thermal-expansion materials. Secondly, their temperatures are highly stabilized with an orbital variation of less the 0.1 ◦C by the unique thermal control idea. Through the preliminary STOP analysis, the structural and thermal structural feasibility of the JASMINE telescope is considered. By combining the results of the structural and thermal design, its thermal deformation is estimated. The optical performance of the JASMINE telescope after the thermal deformation is numerically evaluated. It is found that the thermal displacement of the mirrors in the current structural thermal design produces a slightly large focus-length change. As far as the focus adjustment is adequately applied, the orbital variation of the image distortion pattern is suggested to become acceptable after the low-order correction.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

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Naoki Isobe, Shingo Kashima, Yoshinori Suematsu, Naoteru Gouda, Ryohei Kano, Hirokazu Kataza, Hajime Kawahara, Naoki Kohara, Iona Kondo, Ichiro Mase, Ryou Ohsawa, Toshihiro Tsuzuki, Fumihiko Usui, Shin Utsunomiya, Takehiko Wada, Yoshiyuki Yamada, Taihei Yano, Aoi Takahashi, Tomoya Hattori, Koichi Takeda, and Yukina Arima "Structural, thermal, and optical stability of the JASMINE telescope system", Proc. SPIE 13092, Space Telescopes and Instrumentation 2024: Optical, Infrared, and Millimeter Wave, 1309236 (23 August 2024); https://doi.org/10.1117/12.3017299

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