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, Tobias Marriage, Aamir Ali, John W. Appel, Charles L. Bennett, Fletcher Boone, Michael Brewer, Manwei Chan, David T. Chuss, Felipe Colazo, Sumit Dahal, Kevin Denis, Rolando Dünner, Joseph Eimer, Thomas Essinger-Hileman, Pedro Fluxa, Mark Halpern, Gene Hilton, Gary F. Hinshaw, Johannes Hubmayr, Jeffrey Iuliano, John Karakla, Jeff McMahon, Nathan T. Miller, Samuel H. Moseley, Gonzalo Palma, Lucas Parker, Matthew Petroff, Bastián Pradenas, Karwan Rostem, Marco Sagliocca, Deniz Valle, Duncan Watts, Edward Wollack, Zhilei Xu, 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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