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Characterization of the Atacama B-Mode Search

Author(s): Simon, SM; Raghunathan, S; Appel, JW; Becker, DT; Campusano, LE; et al

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Abstract: The Atacama B-mode Search (ABS), which began observations in February of 2012, is a crossed-Dragone telescope located at an elevation of 5190 m in the Atacama Desert in Chile. ABS is searching for the B-mode polarization spectrum of the cosmic microwave background (CMB) at large angular scales from multipole moments of l approximate to 50 similar to 500, a range that includes the primordial B-mode peak from inflationary gravity waves at l approximate to 100. The ABS focal plane consists of 240 pixels sensitive to 145 GHz, each containing two transition-edge sensor bolometers coupled to orthogonal polarizations with a planar ortho-mode transducer. An ambient-temperature continuously rotating half-wave plate and 4 K optics make the ABS instrument unique. We discuss the characterization of the detector spectral responses with a Fourier transform spectrometer and demonstrate that the pointing model is adequate. We also present measurements of the beam from point sources and compare them with simulations.
Publication Date: 2014
Electronic Publication Date: 23-Jul-2014
Citation: Simon, SM, Raghunathan, S, Appel, JW, Becker, DT, Campusano, LE, Cho, HM, Essinger-Hileman, T, Ho, SP, Irwin, KD, Jarosik, N, Kusaka, A, Niemack, MD, Nixon, GW, Nolta, MR, Page, LA, Palma, GA, Parker, LP, Sievers, JL, Staggs, ST, Visnjic, K. (2014). Characterization of the Atacama B-Mode Search. MILLIMETER, SUBMILLIMETER, AND FAR-INFRARED DETECTORS AND INSTRUMENTATION FOR ASTRONOMY VII, 9153 (10.1117/12.2055576
DOI: doi:10.1117/12.2055576
ISSN: 0277-786X
Type of Material: Journal Article
Version: Final published version. Article is made available in OAR by the publisher's permission or policy.

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