dc.date.accessioned | 2023-02-28T18:33:16Z | |
dc.date.available | 2023-02-28T18:33:16Z | |
dc.date.created | 2023-02-08T22:54:08Z | |
dc.date.issued | 2022 | |
dc.identifier.citation | Datta, Rahul Brewer, Michael K. Couto, Jullianna D. Eimer, Joseph R. Li, Yunyang Xu, Zhilei Appel, John W. Bustos, Ricardo Chuss, David T. Cleary, Joseph Dahal, Sumit Essinger-Hileman, Thomas Iuliano, Jeffrey Marriage, Tobias A. Núñez, Carolina Petroff, Matthew A. Rostem, Karwan Watts, Duncan Wollack, Edward J. . Cosmology Large Angular Scale Surveyor (CLASS): pointing stability and beam measurements at 90, 150, and 220 GHz. Proceedings of SPIE, the International Society for Optical Engineering. 2022, 12190 | |
dc.identifier.uri | http://hdl.handle.net/10852/100517 | |
dc.description.abstract | The Cosmology Large Angular Scale Surveyor (CLASS) telescope array surveys 75% of the sky from the Atacama desert in Chile at frequency bands centered near 40, 90, 150, and 220 GHz. CLASS measures the largest-angular scale (θ ≳ 1 ◦ ) CMB polarization with the aim of constraining the tensor-to-scalar ratio, r, measuring the optical depth to reionization, τ , to near the cosmic variance limit, and more. The CLASS Q-band (40 GHz), W-band (90 GHz), and dichroic high frequency (150/220 GHz) telescopes have been observing since June 2016, May 2018, and September 2019, respectively. On-sky optical characterization of the 40 GHz instrument has been published. Here, we present preliminary on-sky measurements of the beams at 90, 150, and 220 GHz, and pointing stability of the 90 and 150/220 GHz telescopes. The average 90, 150, and 220 GHz beams measured from dedicated observations of Jupiter have full width at half maximum (FWHM) of 0.615±0.019◦ , 0.378±0.005◦ , and 0.266 ± 0.008◦ , respectively. Telescope pointing variations are within a few % of the beam FWHM. | |
dc.language | EN | |
dc.title | Cosmology Large Angular Scale Surveyor (CLASS): pointing stability and beam measurements at 90, 150, and 220 GHz | |
dc.title.alternative | ENEngelskEnglishCosmology Large Angular Scale Surveyor (CLASS): pointing stability and beam measurements at 90, 150, and 220 GHz | |
dc.type | Journal article | |
dc.creator.author | Datta, Rahul | |
dc.creator.author | Brewer, Michael K. | |
dc.creator.author | Couto, Jullianna D. | |
dc.creator.author | Eimer, Joseph R. | |
dc.creator.author | Li, Yunyang | |
dc.creator.author | Xu, Zhilei | |
dc.creator.author | Appel, John W. | |
dc.creator.author | Bustos, Ricardo | |
dc.creator.author | Chuss, David T. | |
dc.creator.author | Cleary, Joseph | |
dc.creator.author | Dahal, Sumit | |
dc.creator.author | Essinger-Hileman, Thomas | |
dc.creator.author | Iuliano, Jeffrey | |
dc.creator.author | Marriage, Tobias A. | |
dc.creator.author | Núñez, Carolina | |
dc.creator.author | Petroff, Matthew A. | |
dc.creator.author | Rostem, Karwan | |
dc.creator.author | Watts, Duncan | |
dc.creator.author | Wollack, Edward J. | |
cristin.unitcode | 185,15,3,0 | |
cristin.unitname | Institutt for teoretisk astrofysikk | |
cristin.ispublished | true | |
cristin.fulltext | postprint | |
cristin.qualitycode | 1 | |
dc.identifier.cristin | 2124307 | |
dc.identifier.bibliographiccitation | info:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Proceedings of SPIE, the International Society for Optical Engineering&rft.volume=12190&rft.spage=&rft.date=2022 | |
dc.identifier.jtitle | Proceedings of SPIE, the International Society for Optical Engineering | |
dc.identifier.volume | 12190 | |
dc.identifier.pagecount | 10 | |
dc.identifier.doi | https://doi.org/10.1117/12.2630649 | |
dc.subject.nvi | VDP::Astrofysikk, astronomi: 438 | |
dc.type.document | Tidsskriftartikkel | |
dc.type.peerreviewed | Peer reviewed | |
dc.source.issn | 0277-786X | |
dc.type.version | AcceptedVersion | |
cristin.articleid | 121902S | |