19 July 2016 The Cosmology Large Angular Scale Surveyor
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Abstract
The Cosmology Large Angular Scale Surveyor (CLASS) is a four telescope array designed to characterize relic primordial gravitational waves from in ation and the optical depth to reionization through a measurement of the polarized cosmic microwave background (CMB) on the largest angular scales. The frequencies of the four CLASS telescopes, one at 38 GHz, two at 93 GHz, and one dichroic system at 145/217 GHz, are chosen to avoid spectral regions of high atmospheric emission and span the minimum of the polarized Galactic foregrounds: synchrotron emission at lower frequencies and dust emission at higher frequencies. Low-noise transition edge sensor detectors and a rapid front-end polarization modulator provide a unique combination of high sensitivity, stability, and control of systematics. The CLASS site, at 5200 m in the Chilean Atacama desert, allows for daily mapping of up to 70% of the sky and enables the characterization of CMB polarization at the largest angular scales. Using this combination of a broad frequency range, large sky coverage, control over systematics, and high sensitivity, CLASS will observe the reionization and recombination peaks of the CMB E- and B-mode power spectra. CLASS will make a cosmic variance limited measurement of the optical depth to reionization and will measure or place upper limits on the tensor-to-scalar ratio, r, down to a level of 0.01 (95% C.L.).
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Kathleen Harrington, Kathleen Harrington, Tobias Marriage, Tobias Marriage, Aamir Ali, Aamir Ali, John W. Appel, John W. Appel, Charles L. Bennett, Charles L. Bennett, Fletcher Boone, Fletcher Boone, Michael Brewer, Michael Brewer, Manwei Chan, Manwei Chan, David T. Chuss, David T. Chuss, Felipe Colazo, Felipe Colazo, Sumit Dahal, Sumit Dahal, Kevin Denis, Kevin Denis, Rolando Dünner, Rolando Dünner, Joseph Eimer, Joseph Eimer, Thomas Essinger-Hileman, Thomas Essinger-Hileman, Pedro Fluxa, Pedro Fluxa, Mark Halpern, Mark Halpern, Gene Hilton, Gene Hilton, Gary F. Hinshaw, Gary F. Hinshaw, Johannes Hubmayr, Johannes Hubmayr, Jeffrey Iuliano, Jeffrey Iuliano, John Karakla, John Karakla, Jeff McMahon, Jeff McMahon, Nathan T. Miller, Nathan T. Miller, Samuel H. Moseley, Samuel H. Moseley, Gonzalo Palma, Gonzalo Palma, Lucas Parker, Lucas Parker, Matthew Petroff, Matthew Petroff, Bastián Pradenas, Bastián Pradenas, Karwan Rostem, Karwan Rostem, Marco Sagliocca, Marco Sagliocca, Deniz Valle, Deniz Valle, Duncan Watts, Duncan Watts, Edward Wollack, Edward Wollack, Zhilei Xu, Zhilei Xu, Lingzhen Zeng, Lingzhen Zeng, "The Cosmology Large Angular Scale Surveyor", Proc. SPIE 9914, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VIII, 99141K (19 July 2016); doi: 10.1117/12.2233125; https://doi.org/10.1117/12.2233125
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