SPICA-FT: the new fringe tracker of the CHARA array

Cyril Pannetier; Philippe Bério; Denis Mourard; Sylvain Rousseau; Fatmé Allouche; Julien Dejonghe; Christophe Bailet; Daniel Lecron; Frédéric Cassaing; Jean-Baptiste Le Bouquin; Karine Perraut; John Monnier; Narsireddy Anugu; Theo ten Brummelaar

doi:10.1117/12.2628897

26 August 2022 SPICA-FT: the new fringe tracker of the CHARA array

Cyril Pannetier, Philippe Bério, Denis Mourard, Sylvain Rousseau, Fatmé Allouche, Julien Dejonghe, Christophe Bailet, Daniel Lecron, Frédéric Cassaing, Jean-Baptiste Le Bouquin, Karine Perraut, John Monnier, Narsireddy Anugu, Theo ten Brummelaar

Author Affiliations +

Proceedings Volume 12183, Optical and Infrared Interferometry and Imaging VIII; 1218309 (2022) https://doi.org/10.1117/12.2628897
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Abstract

SPICA-FT is part of the CHARA/SPICA instrument which combines a visible 6T fibered instrument (SPICAVIS) with a H-band 6T fringe sensor. SPICA-FT is a pairwise ABCD integrated optics combiner. The chip is installed in the MIRC-X instrument. The MIRC-X spectrograph could be fed either by the classical 6T fibered combiner or by the SPICA-FT integrated optics combiner. SPICA-FT also integrates a dedicated fringe tracking software, called the opd-controller communicating with the main delay line through a dedicated channel. We present the design of the integrated optics chip, its implementation in MIRC-X and the software architecture of the group-delay and phase-delay control loops. The final integrated optics chip and the software have been fully characterized in the laboratory. First on-sky tests of the integrated optics combiner began in 2020. We continue the on-sky tests of the whole system (combiner + software) in Spring and Summer 2022. We present the main results, and we deduce the preliminary performance of SPICA-FT.

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Cyril Pannetier, Philippe Bério, Denis Mourard, Sylvain Rousseau, Fatmé Allouche, Julien Dejonghe, Christophe Bailet, Daniel Lecron, Frédéric Cassaing, Jean-Baptiste Le Bouquin, Karine Perraut, John Monnier, Narsireddy Anugu, and Theo ten Brummelaar "SPICA-FT: the new fringe tracker of the CHARA array", Proc. SPIE 12183, Optical and Infrared Interferometry and Imaging VIII, 1218309 (26 August 2022); https://doi.org/10.1117/12.2628897

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