{"paper":{"title":"Four-year Cosmology Large Angular Scale Surveyor (CLASS) Observations: On-sky Receiver Performance at 40, 90, 150, and 220 GHz Frequency Bands","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO"],"primary_cat":"astro-ph.IM","authors_text":"Aamir Ali, Carolina N\\'u\\~nez, Charles L. Bennett, David T. Chuss, Deniz A. N. Valle, Duncan J. Watts, Edward J. Wollack, Francisco Espinoza, Gary Rhoades, Gonzalo A. Palma, Ivan L. Padilla, Janet L. Weiland, Jeffrey Iuliano, Jeffrey J. McMahon, John Karakla, John W. Appel, Joseph Cleary, Joseph E. Golec, Joseph Eimer, Jullianna D. Couto, Karwan Rostem, Kathleen Harrington, Keisuke Osumi, Kevin L. Denis, Kyle Helson, Lucas Parker, Manwei Chan, Matthew A. Petroff, Michael K. Brewer, Nathan J. Miller, Rahul Datta, Ricardo Bustos, Rodrigo Reeves, Rolando D\\\"unner, Sasha Novack, Sumit Dahal, Thomas Essinger-Hileman, Tobias A. Marriage, Yunyang Li, Zhilei Xu","submitted_at":"2021-07-16T17:29:30Z","abstract_excerpt":"The Cosmology Large Angular Scale Surveyor (CLASS) observes the polarized cosmic microwave background (CMB) over the angular scales of 1$^\\circ \\lesssim \\theta \\leq$ 90$^\\circ$ with the aim of characterizing primordial gravitational waves and cosmic reionization. We report on the on-sky performance of the CLASS Q-band (40 GHz), W-band (90 GHz), and dichroic G-band (150/220 GHz) receivers that have been operational at the CLASS site in the Atacama desert since June 2016, May 2018, and September 2019, respectively. We show that the noise-equivalent power measured by the detectors matches the exp"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2107.08022","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2107.08022/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}