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The optical design and physical optics analysis of a cross-Dragonian telescope for LiteBIRD
Author(s): Hiroaki Imada; Tadayasu Dotani; Takashi Hasebe; Masashi Hazumi; Junji Inatani; Hirokazu Ishino; Shingo Kashima; Nobuhiko Katayama; Kimihiro Kimura; Tomotake Matsumura; Ryo Nagata; Yutaro Sekimoto; Hajime Sugai; Aritoki Suzuki; Shin Utsunomiya
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Paper Abstract

The Lite satellite for the studies of B-mode polarization and Inflation from the cosmic microwave background (CMB) Radiation Detection (LiteBIRD) is a next generation CMB satellite dedicated to probing the inflationary universe. It has two telescopes, Low Frequency Telescope (LFT) and High Frequency Telescope (HFT) to cover wide observational bands from 34 GHz to 448 GHz. In this presentation, we report the optical design and characterization of the LFT. We have used the CODE-V to obtain the LFT optical design based on a cross- Dragonian telescope. It is an image-space telecentric system with an F number of 3.5 and 20 x 10 degrees2 field of view. The main, near and far side lobes at far-field have been calculated by using a combination of HFSS and GRASP 10. It is revealed that the LFT telescope has good main lobe properties to satisfy the requirements. On the other hand, the side lobes are affected by the stray light that stems from the triple reflection and the direct path from feed. In order to avoid the stray light, the way to block these paths is now under study.

Paper Details

Date Published: 16 July 2018
PDF: 11 pages
Proc. SPIE 10698, Space Telescopes and Instrumentation 2018: Optical, Infrared, and Millimeter Wave, 106984K (16 July 2018); doi: 10.1117/12.2312185
Show Author Affiliations
Hiroaki Imada, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (Japan)
Tadayasu Dotani, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (Japan)
The Graduate Univ. for Advanced Studies (Japan)
Takashi Hasebe, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (Japan)
Masashi Hazumi, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (Japan)
The Graduate Univ. for Advanced Studies (Japan)
The Univ. of Tokyo/Institute of Particle and Nuclear Studies (Japan)
Junji Inatani, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (Japan)
Hirokazu Ishino, Okayama Univ. (Japan)
Shingo Kashima, National Astronomical Observatory of Japan (Japan)
Nobuhiko Katayama, The Univ. of Tokyo (Japan)
Kimihiro Kimura, Osaka Prefecture Univ. (Japan)
Tomotake Matsumura, The Univ. of Tokyo (Japan)
Ryo Nagata, Institute of Particle and Nuclear Studies (Japan)
Yutaro Sekimoto, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (Japan)
The Graduate Univ. for Advanced Studies (Japan)
Hajime Sugai, The Univ. of Tokyo (Japan)
Aritoki Suzuki, Lawrence Berkeley National Lab. (United States)
Shin Utsunomiya, The Univ. of Tokyo (Japan)


Published in SPIE Proceedings Vol. 10698:
Space Telescopes and Instrumentation 2018: Optical, Infrared, and Millimeter Wave
Makenzie Lystrup; Howard A. MacEwen; Giovanni G. Fazio; Natalie Batalha; Nicholas Siegler; Edward C. Tong, Editor(s)

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