On-sky performance of new 90 GHz detectors for the Cosmology Large Angular Scale Surveyor (CLASS)

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dc.contributor.authorNuĀ“nez, Carolina
dc.contributor.authorAppel, John W.
dc.contributor.authorBrewer, Michael K.
dc.contributor.authorBruno, Sarah Marie
dc.contributor.authorHelson, Kyle
dc.contributor.authoret al
dc.date.accessioned2023-02-08T18:59:50Z
dc.date.available2023-02-08T18:59:50Z
dc.date.issued2023-03-29
dc.descriptionAuthors:- Carolina NuĀ“nez, John W. Appel, Michael K. Brewer, Sarah Marie Bruno, Rahul Datta, Charles L. Bennett, Ricardo Bustos, David T. Chuss, Sumit Dahal, Kevin L. Denis, Joseph Eimer, Thomas Essinger-Hileman, Kyle Helson, Tobias Marriage, Carolina Morales Perez, Ivan L. Padilla, Matthew A. Petroff, Karwan Rostem, Ā“ Duncan J. Watts, Edward J. Wollack, and Zhilei Xuen_US
dc.description.abstractThe 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.en_US
dc.description.sponsorshipWe acknowledge the National Science Foundation Division of Astronomical Sciences for their support of CLASS under Grant Numbers 0959349, 1429236, 1636634, 1654494, 2034400, and 2109311. We thank Johns Hopkins University President R. Daniels and the Krieger School of Arts and Sciences Deans for their steadfast support of CLASS. We further acknowledge the very generous support of Jim and Heather Murren (JHU A&S ā€™88), Matthew Polk (JHU A&S Physics BS ā€™71), David Nicholson, and Michael Bloomberg (JHU Engineering ā€™64). The CLASS project employs detector technology developed in collaboration between JHU and Goddard Space Flight Center under several previous and ongoing NASA grants. Detector development work at JHU was funded by NASA cooperative agreement 80NSSC19M0005. Kyle Helson is supported by NASA under award number 80GSFC17M0002. Zhilei Xu is supported by the Gordon and Betty Moore Foundation through grant GBMF5215 to the Massachusetts Institute of Technology. We acknowledge scientific and engineering contributions from Max Abitbol, Fletcher Boone, David Carcamo, Lance Corbett, Ted Grunberg, Saianeesh Haridas, Jake Hassan, Connor Henley, Ben Keller, Lindsay Lowry, Nick Mehrle, Sasha Novak, Diva Parekh, Isu Ravi, Gary Rhodes, Daniel Swartz, Bingjie Wang, Qinan Wang, Tiffany Wei, Ziang Yan, and Zhuo Zhang. We Ā“ thank Miguel Angel DĀ“ıaz, Jill Hanson, William Deysher, and Chantal Boisvert for logistical support. We acknowledge productive collaboration with Dean Carpenter and the JHU Physical Sciences Machine Shop team. CLASS is located in the Parque Astronomico Atacama in northern Chile under Ā“ the auspices of the Agencia Nacional de Investigacion y Ā“ Desarrollo (ANID).en_US
dc.description.urihttps://ieeexplore.ieee.org/abstract/document/10086549en_US
dc.format.extent4 pagesen_US
dc.genrejournal articlesen_US
dc.identifierdoi:10.13016/m2ufdk-wgc5
dc.identifier.citationNĆŗƱez, Carolina, John W. Appel, Michael K. Brewer, Sarah Marie Bruno, Rahul Datta, Charles L. Bennett, Ricardo Bustos, et al. ā€œOn-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): 1ā€“4. https://doi.org/10.1109/TASC.2023.3262497.
dc.identifier.urihttps://doi.org/10.1109/TASC.2023.3262497
dc.identifier.urihttp://hdl.handle.net/11603/26763
dc.language.isoen_USen_US
dc.publisherIEEE
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC Center for Space Sciences and Technology
dc.relation.ispartofUMBC Faculty Collection
dc.rightsThis 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.*
dc.rightsPublic Domain Mark 1.0*
dc.rights.urihttp://creativecommons.org/publicdomain/mark/1.0/*
dc.titleOn-sky performance of new 90 GHz detectors for the Cosmology Large Angular Scale Surveyor (CLASS)en_US
dc.typeTexten_US
dcterms.creatorhttps://orcid.org/0000-0001-9238-4918en_US

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