Cryogenic performance of FOURIER, the initial science combiner at the MROI

Daniel J. Mortimer; David F. Buscher; Michelle J. Creech-Eakman; Chris Haniff; Christopher Salcido; Eugene Seneta; Xiaowei Sun; John Young

doi:10.1117/12.2629499

26 August 2022 Cryogenic performance of FOURIER, the initial science combiner at the MROI

Daniel J. Mortimer, David F. Buscher, Michelle J. Creech-Eakman, Chris Haniff, Christopher Salcido, Eugene Seneta, Xiaowei Sun, John Young

Author Affiliations +

Proceedings Volume 12183, Optical and Infrared Interferometry and Imaging VIII; 1218323 (2022) https://doi.org/10.1117/12.2629499
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Conference Poster

Abstract

FOURIER is the first-generation science beam combiner for the MROI. It is a three-way, J, H and K band image plane combiner. The FOURIER design emphasises low visibility losses and high optical throughput and is designed around a low-noise SAPHIRA detector. Based on laboratory measurements of its throughput and visibility losses, FOURIER is expected to reach limiting magnitudes of 12.3, 13.2 and 11.7 in the J, H and K bands, respectively, within 5 minutes of incoherent integration assuming 0.7′′ seeing and a detector read noise of 0.3 electrons. As FOURIER observes as red as the K band, the detector and most of its optics are placed within a liquid nitrogen cryostat. We present the design of FOURIER’s cryostat, as well as laboratory tests of the instrument’s cryogenic performance. We also report room temperature characterisation of the optics. Finally, we discuss the path forward from the current status of the instrument to first fringes in 2023.

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Daniel J. Mortimer, David F. Buscher, Michelle J. Creech-Eakman, Chris Haniff, Christopher Salcido, Eugene Seneta, Xiaowei Sun, and John Young "Cryogenic performance of FOURIER, the initial science combiner at the MROI", Proc. SPIE 12183, Optical and Infrared Interferometry and Imaging VIII, 1218323 (26 August 2022); https://doi.org/10.1117/12.2629499

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