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23 July 2014 Characterization of the Atacama B-mode Search
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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 ` ~ 50 ~ 500, a range that includes the primor- dial B-mode peak from inflationary gravity waves at ~ 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 con- tinuously 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.
© (2014) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
S. M. Simon, S. Raghunathan, J. W. Appel, D. T. Becker, L. E. Campusano, H. M. Cho, T. Essinger-Hileman, S. P. Ho, K. D. Irwin, N. Jarosik, A. Kusaka, M. D. Niemack, G. W. Nixon, M. R. Nolta, L. A. Page, G. A. Palma, L. P. Parker, J. L. Sievers, S. T. Staggs, and K. Visnjic "Characterization of the Atacama B-mode Search", Proc. SPIE 9153, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VII, 91530Y (23 July 2014);

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