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Proceedings Paper

Optical alignment of the high-precision UV spectro-polarimeter (CLASP2)
Author(s): Donguk Song; Ryohko Ishikawa; Ryouhei Kano; Masaki Yoshida; Toshihiro Tsuzuki; Fumihiro Uraguchi; Kazuya Shinoda; Hirohisa Hara; Takenori J. Okamoto; Frédéric Auchère; David E. McKenzie; Laurel A. Rachmeler; Javier Trujillo Bueno
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Paper Abstract

Chromospheric LAyer Spectro-Polarimeter (CLASP2) is our next sounding rocket experiment after the success of Chromospheric Lyman-Alpha Spectro-Polarimeter (CLASP1). CLASP2 is scheduled to launch in 2019, and aims to achieve high precision measurements (< 0.1 %) of the linear and circular polarizations in the Mg ii h and k lines near the 280 nm, whose line cores originate in the upper solar chromosphere. The CLASP2 spectro-polarimeter follows very successful design concept of the CLASP1 instrument with the minimal modification. A new grating was fabricated with the same radius of curvature as the CLASP1 grating, but with a different ruling density. This allows us to essentially reuse the CLASP1 mechanical structures and layout of the optics. However, because the observing wavelength of CLASP2 is twice longer than that of CLASP1, a magnifier optical system was newly added in front of the cameras to double the focal length of CLASP2 and to maintain the same wavelength resolution as CLASP1 (0.01 nm). Meanwhile, a careful optical alignment of the spectro-polarimeter is required to reach the 0.01 nm wavelength resolution. Therefore, we established an efficient alignment procedure for the CLASP2 spectro-polarimeter based on an experience of CLASP1. Here, we explain in detail the methods for achieving the optical alignment of the CLASP2 spectro-polarimeter and discuss our results by comparing with the performance requirements.

Paper Details

Date Published: 6 July 2018
PDF: 12 pages
Proc. SPIE 10699, Space Telescopes and Instrumentation 2018: Ultraviolet to Gamma Ray, 106992W (6 July 2018); doi: 10.1117/12.2313056
Show Author Affiliations
Donguk Song, National Astronomical Observatory of Japan (Japan)
Ryohko Ishikawa, National Astronomical Observatory of Japan (Japan)
Ryouhei Kano, National Astronomical Observatory of Japan (Japan)
Masaki Yoshida, National Astronomical Observatory of Japan (Japan)
Toshihiro Tsuzuki, National Astronomical Observatory of Japan (Japan)
Fumihiro Uraguchi, National Astronomical Observatory of Japan (Japan)
Kazuya Shinoda, National Astronomical Observatory of Japan (Japan)
Hirohisa Hara, National Astronomical Observatory of Japan (Japan)
Takenori J. Okamoto, National Astronomical Observatory of Japan (Japan)
Frédéric Auchère, Institut d'Astrophysique Spatiale (France)
David E. McKenzie, NASA Marshall Space Flight Ctr. (United States)
Laurel A. Rachmeler, NASA Marshall Space Flight Ctr. (United States)
Javier Trujillo Bueno, Instituto de Astrofísica de Canarias (Spain)


Published in SPIE Proceedings Vol. 10699:
Space Telescopes and Instrumentation 2018: Ultraviolet to Gamma Ray
Jan-Willem A. den Herder; Shouleh Nikzad; Kazuhiro Nakazawa, Editor(s)

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