Sunrise Chromospheric Infrared spectroPolarimeter (SCIP) for SUNRISE III: optical design and performance

Toshihiro Tsuzuki; Yukio Katsukawa; Fumihiro Uraguchi; Hirohisa Hara; Masahito Kubo; Yoshifumi Nodomi; Yoshinori Suematsu; Yusuke Kawabata; Toshifumi Shimizu; Achim Gandorfer; Alex Feller; Bianca Grauf; Sami Solanki; Jose Carlos del Toro Iniesta

doi:10.1117/12.2562245

13 December 2020 Sunrise Chromospheric Infrared spectroPolarimeter (SCIP) for SUNRISE III: optical design and performance

Toshihiro Tsuzuki, Yukio Katsukawa, Fumihiro Uraguchi, Hirohisa Hara, Masahito Kubo, Yoshifumi Nodomi, Yoshinori Suematsu, Yusuke Kawabata, Toshifumi Shimizu, Achim Gandorfer, Alex Feller, Bianca Grauf, Sami Solanki, Jose Carlos del Toro Iniesta

Author Affiliations +

Proceedings Volume 11447, Ground-based and Airborne Instrumentation for Astronomy VIII; 11447AJ (2020) https://doi.org/10.1117/12.2562245
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Conference Poster

Abstract

The Sunrise Chromospheric Infrared spectroPolarimeter (SCIP) is a near-IR spectro-polarimeter instrument newly designed for Sunrise III, which is a balloon-borne solar observatory equipped with a 1 m optical telescope. To acquire high-quality 3D magnetic and velocity fields, SCIP selects the two wavelength bands centered at 850 nm and 770 nm, which contain many spectrum lines that are highly sensitive to magnetic fields permeating the photosphere and chromosphere. To achieve high spatial and spectral resolution (0.21 arcsec and 2 × 10⁵), SCIP optics adopt a quasi-Littrow configuration based on an echelle grating and two high-order aspheric mirrors. Using different diffraction orders of the echelle grating, dichroic beam splitter, and polarizing beam-splitters, SCIP can obtain s- and p-polarization signals in the two wavelength bands simultaneously within a relatively small space. We established the wavefront error budget based on tolerance analysis, surface figure errors, alignment errors, and environmental changes. In addition, we performed stray light analysis, and designed light traps and baffles needed to suppress unwanted reflections and diffraction by the grating. In this paper, we present the details of this optical system and its performance.

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Toshihiro Tsuzuki, Yukio Katsukawa, Fumihiro Uraguchi, Hirohisa Hara, Masahito Kubo, Yoshifumi Nodomi, Yoshinori Suematsu, Yusuke Kawabata, Toshifumi Shimizu, Achim Gandorfer, Alex Feller, Bianca Grauf, Sami Solanki, and Jose Carlos del Toro Iniesta "Sunrise Chromospheric Infrared spectroPolarimeter (SCIP) for SUNRISE III: optical design and performance", Proc. SPIE 11447, Ground-based and Airborne Instrumentation for Astronomy VIII, 11447AJ (13 December 2020); https://doi.org/10.1117/12.2562245

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