On-sky performance of new 90 GHz detectors for the Cosmology Large Angular Scale Surveyor (CLASS)
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Author/Creator ORCID
Date
2023-03-29
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Citation of Original Publication
NĆŗƱez, Carolina, John W. Appel, Michael K. Brewer, Sarah Marie Bruno, Rahul Datta, Charles L. Bennett, Ricardo Bustos, et al. āOn-Sky Performance of New 90 GHz Detectors for the Cosmology Large Angular Scale Surveyor (CLASS).ā IEEE Transactions on Applied Superconductivity 33, no. 5 (August 2023): 1ā4. https://doi.org/10.1109/TASC.2023.3262497.
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This work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.
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Abstract
The Cosmology Large Angular Scale Surveyor
(CLASS) is a polarization-sensitive telescope array located at an
altitude of 5,200 m in the Chilean Atacama Desert and designed
to measure the polarized Cosmic Microwave Background (CMB)
over large angular scales. The CLASS array is currently observing with three telescopes covering four frequency bands: one
at 40 GHz (Q); one at 90 GHz (W1); and one dichroic system
at 150/220 GHz (HF). During the austral winter of 2022, we
upgraded the first 90 GHz telescope (W1) by replacing four of the
seven focal plane modules. These new modules contain detector
wafers with an updated design, aimed at improving the optical
efficiency and detector stability. We present a description of the
design changes and measurements of on-sky optical efficiencies
derived from observations of Jupiter.