The POLARBEAR Cosmic Microwave Background Polarization Experiment
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The polarbear cosmic microwave background (CMB) polarization experiment has been observing since early 2012 from its 5,200 m site in the Atacama Desert in Northern Chile. polarbear’s measurements will characterize the expected CMB polarization due to gravitational lensing by large scale structure, and search for the possible B-mode polarization signature of inflationary gravitational waves. polarbear’s 250 mK focal plane detector array consists of 1,274 polarization-sensitive antenna-coupled bolometers, each with an associated lithographed band-defining filter and contacting dielectric lenslet, an architecture unique in current CMB experiments. The status of the polarbear instrument, its focal plane, and the analysis of its measurements are presented.
KeywordsCosmic microwave background CMB polarization Millimeter-wave
polarbear is funded by the National Science Foundation under Grant AST-0618398. Antenna-coupled bolometer development at Berkeley is funded by NASA under Grant NNG06GJ08G. The McGill authors acknowledge funding from the Natural Sciences and Engineering Research Council and Canadian Institute for Advanced Research. The KEK authors are supported by MEXT KAKENHI Grant Number 21111002. The Chilean site is located in the Parque Astronomico Atacama in agreement with the Comisión Nacional de Investigación Científica y Tecnológica de Chile. The Simons Array is funded by the Simons Foundation.