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Proceedings Article

The POLARBEAR-2 experiment

[+] Author Affiliations
Takayuki Tomaru, Masashi Hazumi, Yuji Chinone, Masaya Hasegawa, Kaori Hattori, Nobuhiro Kimura, Tomotake Matsumura, Hideki Morii, Takahiro Okamura, Jun-ichi Suzuki, Ken-ichi Tanaka

High Energy Accelerator Research Organization (Japan)

Adrian T. Lee, Kam Arnold, Adnan Ghribi, William L. Holzapfel, Zigmund Kermish, William Kranz, Michael J. Myers, Haruki Nishino, Erin Quealy, Christian L. Reichardt, Paul L. Richards, Darin Rosen, Michael Sholl, Aritoki Suzuki

Univ. of California, Berkeley (United States)

Peter Ade, William Grainger

Cardiff Univ. (United Kingdom)

Darcy Barron, Brian Keating, Frederick Matsuda, Praween Siritanasak, Nathan Stebor

Univ. of California, San Diego (United States)

Julian Borrill, Ted Kisner, Oliver Zahn

Lawrence Berkeley National Lab. (United States)

Scott Chapman, Colin Ross, Peter Smith

Dalhousie Univ. (Canada)

Matt Dobbs

McGill Univ. (Canada)

Josquin Errard, Giullo Fabbian, Radek Stompor

Lab. Astroparticule et Cosmologie, CNRS, Univ. Paris 7 (France)

Nils Halverson

Univ. of Colorado at Boulder (United States)

Yuki Inoue, Akie Shimizu

The Graduate Univ. for Advanced Studies (Japan)

Sou Ishii, Suguru Takada

Univ. of Tsukuba (Japan)

Yuta Kaneko

Univ. of Tokyo (Japan)

Proc. SPIE 8452, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VI, 84521H (September 24, 2012); doi:10.1117/12.926158
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From Conference Volume 8452

  • Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VI
  • Wayne S. Holland
  • Amsterdam, Netherlands | July 01, 2012


POLARBEAR-2 (PB-2) is a cosmic microwave background (CMB) polarization experiment observing at Atacama plateau in Chile. PB-2 is designed to improve the sensitivity to measure the CMB B-mode polarization by upgrading the current POLARBEAR-1 receiver that is currently mounted on the Huan Tran telescope. The improvements in PB-2 include, i) the dual band observations at 95 GHz and 150 GHz in each pixel using an sinuous antenna, ii) the increase of the total number of detectors, 7588 Al-Ti bilayer transition-edge sensor (TES) bolometers, iii) the bath temperature of bolometers at 100mK in the second phase of observation (300mK in the first phase.) With the expected sensitivity of 5.7 μK √ s, PB-2 is sensitive to a tensor-to-scalar ratio, r, of 0.01 at 95% confidence level (CL) and constrains the sum of neutrino masses as 90meV by PB-2 alone and 40meV by combining PB-2 and Planck at 68% CL. We schedule to deploy in 2014.© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.

Takayuki Tomaru ; Masashi Hazumi ; Adrian T. Lee ; Peter Ade ; Kam Arnold, et al.
"The POLARBEAR-2 experiment", Proc. SPIE 8452, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VI, 84521H (September 24, 2012); doi:10.1117/12.926158; http://dx.doi.org/10.1117/12.926158

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