The POLARBEAR-2 experiment

Suzuki, A., Ade, Peter ORCID: https://orcid.org/0000-0002-5127-0401, Akiba, Y., Aleman, C., Arnold, K., Atlas, M., Barron, D., Borrill, J., Chapman, S., Chinone, Y., Cukierman, A., Dobbs, M., Elleflot, T., Errard, J., Fabbian, G., Feng, G., Gilbert, A., Grainger, W., Halverson, N., Hasegawa, M., Hattori, K., Hazumi, M., Holzapfel, W., Hori, Y., Inoue, Y., Jaehnig, G., Katayama, N., Keating, B., Kermish, Z., Keskitalo, R., Kisner, T., Lee, A., Matsuda, F., Matsumura, T., Morii, H., Moyerman, S., Myers, M., Navaroli, M., Nishino, H., Okamura, T., Reichart, C., Richards, P., Ross, C., Rotermund, K., Sholl, M., Siritanasak, P., Smecher, G., Stebor, N., Stompor, R., Suzuki, J., Takada, S., Takakura, S., Tomaru, T., Wilson, B., Yamaguchi, H. and Zahn, O. 2014. The POLARBEAR-2 experiment. Journal of Low Temperature Physics 176 (5-6) , pp. 719-725. 10.1007/s10909-014-1112-x

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Abstract

We present an overview of the design and development of the POLARBEAR-2 experiment. The POLARBEAR-2 experiment is a cosmic microwave background polarimetry experiment, which aims to characterize the small angular scale B-mode signal due to gravitational lensing and search for the large angular scale B-mode signal from inflationary gravitational waves. The experiment will have a 365 mm diameter multi-chroic focal plane filled with 7,588 polarization sensitive antenna-coupled Transition Edge Sensor bolometers and will observe at 95 and 150 GHz. The focal plane is cooled to 250 mK. The bolometers will be read-out by SQUIDs with 32× 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 half-wave plate will be used to give stringent control over systematic errors. The experiment is designed to achieve a noise equivalent temperature of 5.7 μ Ks √ , and this allows us to constrain the signal from the inflationary primordial gravitational corresponding to a tensor-to-scalar ratio of r=0.01 (2σ ). POLARBEAR-2 will also be able to put a constraint on the sum of neutrino masses to 90 meV (1σ ) with POLARBEAR-2 data alone and 65 meV (1σ ) when combined with the Planck satellite. We plan to start observations in 2014 in the Atacama Desert in Chile.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Subjects:	Q Science > QC Physics
Publisher:	Springer
ISSN:	0022-2291
Date of Acceptance:	23 January 2014
Last Modified:	31 Oct 2022 08:56
URI:	https://orca.cardiff.ac.uk/id/eprint/79284

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