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arXiv · 1210.4971

Performance and on-sky optical characterization of the SPTpol instrument

E. M. George·P. Ade·K. A. Aird·J. E. Austermann·J. A. Beall·D. Becker·A. Bender·B. A. Benson·L. E. Bleem·J. Britton·J. E. Carlstrom·C. L. Chang·H. C. Chiang·H-M. Cho·T. M. Crawford·A. T. Crites·A. Datesman·T. de Haan·M. A. Dobbs·W. Everett·A. Ewall-Wice·N. W. Halverson·N. Harrington·J. W. Henning·G. C. Hilton·W. L. Holzapfel·S. Hoover·N. Huang·J. Hubmayr·K. D. Irwin·M. Karfunkle·R. Keisler·J. Kennedy·A. T. Lee·E. Leitch·D. Li·M. Lueker·D. P. Marrone·J. J. McMahon·J. Mehl·S. S. Meyer·J. Montgomery·T. E. Montroy·J. Nagy·T. Natoli·J. P. Nibarger·M. D. Niemack·V. Novosad·S. Padin·C. Pryke·C. L. Reichardt·J. E. Ruhl·B. R. Saliwanchik·J. T. Sayre·K. K. Schaffer·E. Shirokoff·K. Story·C. Tucker·K. Vanderlinde·J. D. Vieira·G. Wang·R. Williamson·V. Yefremenko·K. W. Yoon·E. Young
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Abstract

In January 2012, the 10m South Pole Telescope (SPT) was equipped with a polarization-sensitive camera, SPTpol, in order to measure the polarization anisotropy of the cosmic microwave background (CMB). Measurements of the polarization of the CMB at small angular scales (~several arcminutes) can detect the gravitational lensing of the CMB by large scale structure and constrain the sum of the neutrino masses. At large angular scales (~few degrees) CMB measurements can constrain the energy scale of Inflation. SPTpol is a two-color mm-wave camera that consists of 180 polarimeters at 90 GHz and 588 polarimeters at 150 GHz, with each polarimeter consisting of a dual transition edge sensor (TES) bolometers. The full complement of 150 GHz detectors consists of 7 arrays of 84 ortho-mode transducers (OMTs) that are stripline coupled to two TES detectors per OMT, developed by the TRUCE collaboration and fabricated at NIST. Each 90 GHz pixel consists of two antenna-coupled absorbers coupled to two TES detectors, developed with Argonne National Labs. The 1536 total detectors are read out with digital frequency-domain multiplexing (DfMUX). The SPTpol deployment represents the first on-sky tests of both of these detector technologies, and is one of the first deployed instruments using DfMUX readout technology. We present the details of the design, commissioning, deployment, on-sky optical characterization and detector performance of the complete SPTpol focal plane.

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E. M. George, P. Ade, K. A. Aird, J. E. Austermann, J. A. Beall, D. Becker, A. Bender, B. A. Benson, L. E. Bleem, J. Britton, J. E. Carlstrom, C. L. Chang, H. C. Chiang, H-M. Cho, T. M. Crawford, A. T. Crites, A. Datesman, T. de Haan, M. A. Dobbs, W. Everett, A. Ewall-Wice, N. W. Halverson, N. Harrington, J. W. Henning, G. C. Hilton, W. L. Holzapfel, S. Hoover, N. Huang, J. Hubmayr, K. D. Irwin, M. Karfunkle, R. Keisler, J. Kennedy, A. T. Lee, E. Leitch, D. Li, M. Lueker, D. P. Marrone, J. J. McMahon, J. Mehl, S. S. Meyer, J. Montgomery, T. E. Montroy, J. Nagy, T. Natoli, J. P. Nibarger, M. D. Niemack, V. Novosad, S. Padin, C. Pryke, C. L. Reichardt, J. E. Ruhl, B. R. Saliwanchik, J. T. Sayre, K. K. Schaffer, E. Shirokoff, K. Story, C. Tucker, K. Vanderlinde, J. D. Vieira, G. Wang, R. Williamson, V. Yefremenko, K. W. Yoon, E. Young. 2012-10-17. Performance and on-sky optical characterization of the SPTpol instrument. https://doi.org/10.1117/12.925586

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