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Modeling and characterization of the SPIDER half-wave plate

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arxiv 1006.3874 v1 pith:MUDXS64B submitted 2010-06-19 astro-ph.IM astro-ph.CO

Modeling and characterization of the SPIDER half-wave plate

Sean A. Bryan , Peter A. R. Ade , Mandana Amiri , Steve Benton , Richard Bihary , James J. Bock , J. Richard Bond , Joseph A. Bonetti
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H. Cynthia Chiang Carlo R. Contaldi Brendan P. Crill Daniel O'Dea Olivier Dore Marzieh Farhang Jeffrey P. Filippini Laura Fissel Natalie Gandilo Sunil Golwala Jon E. Gudmundsson Matthew Hasselfield Mark Halpern Kyle R. Helson Gene Hilton Warren Holmes Viktor V. Hristov Kent D. Irwin William C. Jones Chao Lin Kuo Carrie J. MacTavish Peter Mason Tracy Morford Thomas E. Montroy C. Barth Netterfield Alexandra S. Rahlin Carl D. Reintsema Daniel Riley John E. Ruhl Marcus C. Runyan Matthew A. Schenker Jamil Shariff Juan Diego Soler Amy Trangsrud Rebecca Tucker Carole Tucker Anthony Turner
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classification astro-ph.IM astro-ph.CO
keywords spectraspidersapphirecryogenichalf-waveplatepolarizationwill
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Spider is a balloon-borne array of six telescopes that will observe the Cosmic Microwave Background. The 2624 antenna-coupled bolometers in the instrument will make a polarization map of the CMB with approximately one-half degree resolution at 145 GHz. Polarization modulation is achieved via a cryogenic sapphire half-wave plate (HWP) skyward of the primary optic. We have measured millimeter-wave transmission spectra of the sapphire at room and cryogenic temperatures. The spectra are consistent with our physical optics model, and the data gives excellent measurements of the indices of A-cut sapphire. We have also taken preliminary spectra of the integrated HWP, optical system, and detectors in the prototype Spider receiver. We calculate the variation in response of the HWP between observing the CMB and foreground spectra, and estimate that it should not limit the Spider constraints on inflation.

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Cited by 1 Pith paper

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  1. Robust CMB polarisation mapmaking with a rotating half-wave plate

    astro-ph.IM 2026-06 unverdicted novelty 6.0

    POMME is a new estimator that marginalizes signals varying slower than the HWP rotation timescale to produce unbiased CMB polarisation maps with near-optimal noise in the presence of strong contaminants.