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  SUNRISE Chromospheric Infrared spectroPolarimeter (SCIP) for SUNRISE III: Scan mirror mechanism

Oba, T., Shimizu, T., Katsukawa, Y., Kubo, M., Uraguchi, F., Tsuzuki, T., et al. (2020). SUNRISE Chromospheric Infrared spectroPolarimeter (SCIP) for SUNRISE III: Scan mirror mechanism. In Proceedings Volume 11445, Ground-based and Airborne Telescopes VIII.

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Oba, T., Author
Shimizu, T., Author
Katsukawa, Y., Author
Kubo, M., Author
Uraguchi, F., Author
Tsuzuki, T., Author
Tamura, T., Author
Shinoda, K., Author
Kodeki, K., Author
Fukushima, K., Author
Gandorfer, Achim M.1, Author              
Del Toro Iniesta, J.C., Author
Affiliations:
1Department Sun and Heliosphere, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832289              

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 Abstract: The SUNRISE Chromospheric Infrared spectroPolarimeter (SCIP) is a balloon-borne long-slit spectrograph for SUNRISE III to precisely measure magnetic fields in the solar atmosphere. The scan mirror mechanism (SMM) is installed in the optical path to the entrance slit of the SCIP to move solar images focused on the slit for 2-dimensional mapping. The SMM is required to have (1) the tilt stability better than 0.035″ (3σ) on the sky angle for the diffraction-limited spatial resolution of 0.2″, (2) step response shorter than 32 msec for rapid scanning observations, and (3) good linearity (i.e. step uniformity) over the entire field-of-view (60″x60″). To achieve these performances, we have developed a flight-model mechanism and its electronics, in which the mirror tilt is controlled by electromagnetic actuators with a closed-loop feedback logic with tilt angles from gap-based capacitance sensors. Several optical measurements on the optical bench verified that the mechanism meets the requirements. In particular, the tilt stability achives better than 0.012″ (3σ). Thermal cycling and thermal vacuum tests have been completed to demonstrate the performance in the vacuum and the operational temperature range expected in the balloon flight. We found a small temperature dependence in the step uniformity and this dependence will be corrected to have 2-demensional maps with the sub-arcsec spatial accuracy in the data post-processing.

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Language(s): eng - English
 Dates: 2020
 Publication Status: Published in print
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 Identifiers: DOI: 10.1117/12.2562075
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Title: Proceedings Volume 11445, Ground-based and Airborne Telescopes VIII
Source Genre: Proceedings
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Pages: - Volume / Issue: - Sequence Number: 114454F Start / End Page: - Identifier: -