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ACTPol: A polarization-sensitive receiver for the Atacama Cosmology Telescope

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arxiv 1006.5049 v1 pith:BTJXQ7PR submitted 2010-06-25 astro-ph.IM astro-ph.CO

ACTPol: A polarization-sensitive receiver for the Atacama Cosmology Telescope

M. D. Niemack , P. A. R. Ade , J. Aguirre , F. Barrientos , J. A. Beall , J. R. Bond , J. Britton , H. M. Cho
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S. Das M. J. Devlin S. Dicker J. Dunkley R. Dunner J. W. Fowler A. Hajian M. Halpern M. Hasselfield G. C. Hilton M. Hilton J. Hubmayr J. P. Hughes L. Infante K. D. Irwin N. Jarosik J. Klein A. Kosowsky T. A. Marriage J. McMahon F. Menanteau K. Moodley J. P. Nibarger M. R. Nolta L. A. Page B. Partridge E. D. Reese J. Sievers D. N. Spergel S. T. Staggs R. Thornton C. Tucker E. Wollack K. W. Yoon
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keywords actpolreceiveratacamacosmiccosmologymassesneutrinoscience
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The six-meter Atacama Cosmology Telescope (ACT) in Chile was built to measure the cosmic microwave background (CMB) at arcminute angular scales. We are building a new polarization sensitive receiver for ACT (ACTPol). ACTPol will characterize the gravitational lensing of the CMB and aims to constrain the sum of the neutrino masses with ~0.05 eV precision, the running of the spectral index of inflation-induced fluctuations, and the primordial helium abundance to better than 1%. Our observing fields will overlap with the SDSS BOSS survey at optical wavelengths, enabling a variety of cross-correlation science, including studies of the growth of cosmic structure from Sunyaev-Zel'dovich observations of clusters of galaxies as well as independent constraints on the sum of the neutrino masses. We describe the science objectives and the initial receiver design.

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