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Title: The Polarbear-2 and the Simons Array experiments

Here, we present an overview of the design and status of the POLARBEAR-2 and the Simons Array experiments. POLARBEAR- 2 is a Cosmic Microwave Background polarimetry experiment which aims to characterize the arc-minute angular scale B-mode signal from weak gravitational lensing and search for the degree angular scale B-mode signal from inflationary gravitational waves. The receiver has a 365 mm diameter focal plane cooled to 270 milli-Kelvin. The focal plane is filled with 7,588 dichroic lenslet-antenna coupled polarization sensitive Transition Edge Sensor (TES) bolometric pixels that are sensitive to 95 GHz and 150 GHz bands simultaneously. The TES bolometers are read-out by SQUIDs with 40 channel frequency domain multiplexing. Refractive optical elements are made with high purity alumina to achieve high optical throughput. The receiver is designed to achieve noise equivalent temperature of 5.8 µK CMB√s in each frequency band. POLARBEAR-2 will deploy in 2016 in the Atacama desert in Chile. The Simons Array is a project to further increase sensitivity by deploying three POLARBEAR-2 type receivers. The Simons Array will cover 95 GHz, 150 GHz and 220 GHz frequency bands for foreground control. The Simons Array will be able to constrain tensor-to-scalar ratio and sum of neutrino masses tomore » σ(r) = 6×10 $-$3 at r = 0.1 and Σm ν(σ = 1) to 40 meV.« less
Authors:
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  1. Univ. of California, Berkeley, CA (United States)
  2. Cardiff Univ., Cardiff (United Kingdom)
  3. High Energy Accelerator Research Org., (KEK), Tsukuba (Japan); SOKENDAI Kamiyamaguchi, Miura (Japan)
  4. Univ. of California, San Diego, CA (United States)
  5. Univ. of Wisconsin, Madison, WI (United States)
  6. International School for Advanced Studies (SISSA), Trieste (Italy)
  7. Argonne National Lab. (ANL), Argonne, IL (United States)
  8. Pontifica Univ. Catolica, Santiago (Chile)
  9. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  10. Dalhousie Univ., Halifax (Canada)
  11. McGill Univ., Montreal, QC (Canada)
  12. Imperial College, London (United Kingdom)
  13. Sorbonne Univ., Paris (France)
  14. Univ. of California, Irvine, CA (United States)
  15. The Univ. of Tokyo, Chiba (Japan)
  16. Univ. of Colorado, Boulder, CO (United States)
  17. High Energy Accelerator Research Organization (KEK), Tsukuba (Japan)
  18. The Univ. of Tokyo, Chiba (Japan); High Energy Accelerator Research Organization (KEK), Tsukuba (Japan); SOKENDAI Kamiyamaguchi, Miura (Japan)
  19. High Energy Accelerator Research Organization (KEK), Tsukuba (Japan); SOKENDAI Kamiyamaguchi, Miura (Japan)
  20. Princeton Univ., Princeton, NJ (United States)
  21. Univ. Paris Diderot, Paris (France)
  22. Japan Aerospace Exploration Agency (JAXA), Sagamihara (Japan)
  23. NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)
  24. Univ. of Melbourne, Parkville (Australia)
  25. National Institute for Fusion Science, Toki (Japan)
Publication Date:
Grant/Contract Number:
AC02-06CH11357
Type:
Accepted Manuscript
Journal Name:
Journal of Low Temperature Physics
Additional Journal Information:
Journal Volume: 184; Journal Issue: 3-4; Journal ID: ISSN 0022-2291
Publisher:
Plenum Press
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org:
Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Aeronautic and Space Administration (NASA); Canadian Institute for Advanced Research (CIFAR)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; B-mode; cosmic microwave background; gravitational weak lensing; inflation; polarization
OSTI Identifier:
1346061