Physics – Optics
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21921201m&link_type=abstract
American Astronomical Society, AAS Meeting #219, #212.01
Physics
Optics
Scientific paper
The Q/U Imaging ExperimenT (QUIET) aims to limit or detect cosmic microwave background (CMB) divergence-free (B-mode) polarization from inflation. This talk is part 1 of a 3-talk series on QUIET.
QUIET operated in the Chilean Atacama desert between August 2008 and December 2010. During its second season it observed with a 90-element W-band receiver at 94 GHz. QUIET's primary goal is the detection of the B-mode polarization of the CMB predicted by inflationary models. This is one of the great objectives of the current generation of cosmology experiments. In order to realize the extremely low signal levels necessary to detect B-mode polarization, QUIET has incorporated a number of novel design features that have combined to minimize systematic effects. Some of these include an all-enshrouding, absorbing ground screen, side-fed Dragonian optics, platelet arrays of corrugated feedhorns, low crosstalk septum polarizers, compact MMIC modules and a double demodulation scheme. The talk provides an overview of the science goals and a description of the instrument, scanning strategies and calibration techniques. It also presents a straightforward approach to extracting and understanding low level instrumental polarization which can ultimately hamper these types of measurements. The next talks will provide an overview of the two parallel pipelines used in the QUIET data analysis.
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