SPIRou at CFHT: fiber links and pupil slicer

Yoan Micheau; Driss Kouach; Jean-François Donati; Gerard Gallou; Marcel Belot; Nicolas Striebig; Sébastien Baratchart; Zalpha Challita; Laurent Parès; Bruno Dubois; Marielle Lacombe; Gregory Barrick; François Bouchy; Francesco Pepe

doi:10.1117/12.2305937

6 July 2018 SPIRou at CFHT: fiber links and pupil slicer

Yoan Micheau, Driss Kouach, Jean-François Donati, Gerard Gallou, Marcel Belot, Nicolas Striebig, Sébastien Baratchart, Zalpha Challita, Laurent Parès, Bruno Dubois, Marielle Lacombe, Gregory Barrick, François Bouchy, Francesco Pepe

Author Affiliations +

Proceedings Volume 10702, Ground-based and Airborne Instrumentation for Astronomy VII; 107025R (2018) https://doi.org/10.1117/12.2305937
Event: SPIE Astronomical Telescopes + Instrumentation, 2018, Austin, Texas, United States

Abstract

SPIRou is a near-IR (0.98-2.35μm) echelle spectropolarimeter / high precision velocimeter installed at the beginning of the year 2018 on the 3.6m Canada-France-Hawaii Telescope (CFHT) on Mauna Kea, Hawaii, with the main goal of detecting Earth-like planets around low mass stars and magnetic fields of forming stars. In this paper, the fiber links which connects the polarimeter unit to the cryogenic spectrograph unit (35 meter apart) are described. The pupil slicer which forms a slit compatible with the spectrograph entrance specifications is also discussed in this paper. Some challenging aspects are presented. In particular this paper will focus on the manufacturing of 35 meter fibers with a very low loss attenuation (< 13dB/km) in the non-usual fiber spectral domain from 0.98 μm to 2.35 μm. Other aspects as the scrambling performance of the fiber links to reach high accuracy radial velocity measurements (<1m/s) and the performances of the pupil slicer exposed at a cryogenic and vacuum environment will be discussed.

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Yoan Micheau, Driss Kouach, Jean-François Donati, Gerard Gallou, Marcel Belot, Nicolas Striebig, Sébastien Baratchart, Zalpha Challita, Laurent Parès, Bruno Dubois, Marielle Lacombe, Gregory Barrick, François Bouchy, and Francesco Pepe "SPIRou at CFHT: fiber links and pupil slicer", Proc. SPIE 10702, Ground-based and Airborne Instrumentation for Astronomy VII, 107025R (6 July 2018); https://doi.org/10.1117/12.2305937

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