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SPIDER: a balloon-borne CMB polarimeter for large angular scales

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arxiv 1106.2158 v1 pith:LCGMGM3O submitted 2011-06-10 astro-ph.CO astro-ph.IM

classification astro-ph.COastro-ph.IM
keywords spiderpolarizationwillangularballoon-borneflightmissionachieve
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We describe SPIDER, a balloon-borne instrument to map the polarization of the millimeter-wave sky with degree angular resolution. Spider consists of six monochromatic refracting telescopes, each illuminating a focal plane of large-format antenna-coupled bolometer arrays. A total of 2,624 superconducting transition-edge sensors are distributed among three observing bands centered at 90, 150, and 280 GHz. A cold half-wave plate at the aperture of each telescope modulates the polarization of incoming light to control systematics. Spider's first flight will be a 20-30-day Antarctic balloon campaign in December 2011. This flight will map \sim8% of the sky to achieve unprecedented sensitivity to the polarization signature of the gravitational wave background predicted by inflationary cosmology. The Spider mission will also serve as a proving ground for these detector technologies in preparation for a future satellite mission.

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