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Title of Journal: J Low Temp Phys

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Abbravation: Journal of Low Temperature Physics

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Springer US

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DOI

10.1007/7089_2006_099

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1573-7357

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The POLARBEAR2 Experiment

Authors: A Suzuki P Ade Y Akiba C Aleman K Arnold M Atlas D Barron J Borrill S Chapman Y Chinone A Cukierman M Dobbs T Elleflot J Errard G Fabbian G Feng A Gilbert W Grainger N Halverson M Hasegawa K Hattori M Hazumi W Holzapfel Y Hori Y Inoue G Jaehnig N Katayama B Keating Z Kermish R Keskitalo T Kisner A Lee F Matsuda T Matsumura H Morii S Moyerman M Myers M Navaroli H Nishino T Okamura C Reichart P Richards C Ross K Rotermund M Sholl P Siritanasak G Smecher N Stebor R Stompor J Suzuki S Takada S Takakura T Tomaru B Wilson H Yamaguchi O Zahn
Publish Date: 2014/02/22
Volume: 176, Issue: 5-6, Pages: 719-725
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Abstract

We present an overview of the design and development of the POLARBEAR2 experiment The POLARBEAR2 experiment is a cosmic microwave background polarimetry experiment which aims to characterize the small angular scale Bmode signal due to gravitational lensing and search for the large angular scale Bmode signal from inflationary gravitational waves The experiment will have a 365 mm diameter multichroic focal plane filled with 7588 polarization sensitive antennacoupled Transition Edge Sensor bolometers and will observe at 95 and 150 GHz The focal plane is cooled to 250 mK The bolometers will be readout by SQUIDs with 32times frequency domain multiplexing The experiment will utilize high purity alumina lenses and thermal filters to achieve the required high optical throughput A continuously rotating cooled halfwave plate will be used to give stringent control over systematic errors The experiment is designed to achieve a noise equivalent temperature of 57 mu Ksqrts and this allows us to constrain the signal from the inflationary primordial gravitational corresponding to a tensortoscalar ratio of r = 001 2sigma POLARBEAR2 will also be able to put a constraint on the sum of neutrino masses to 90 meV 1sigma with POLARBEAR2 data alone and 65 meV 1sigma when combined with the Planck satellite We plan to start observations in 2014 in the Atacama Desert in ChileWe acknowledge support from the MEXT Kahenhi grant 21111002 NSF grant AST0618398 NASA grant NNG06GJ08G The Simons Foundation Natural Sciences and Engineering Research Council Canadian Institute for Advanced Research and the CONICYT Detectors were fabricated at Berkeley nanofabrication laboratory

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