The Polarbear-2 and the Simons Array experiments

Suzuki, A., Ade, Peter A. R. ORCID: https://orcid.org/0000-0002-5127-0401, Akiba, Y., Aleman, C., Arnold, K., Baccigalupi, C., Barch, B., Barron, D., Bender, A., Boettger, D., Borrill, J., Chapman, S., Chinone, Y., Cukierman, A., Dobbs, M., Ducout, A., Dunner, R., Elleflot, T., Errard, J., Fabbian, G., Feeney, S., Feng, C., Fujino, T., Fuller, G., Gilbert, A., Goeckner-Wald, N., Groh, J., Haan, T. De, Hall, G., Halverson, N., Hamada, T., Hasegawa, M., Hattori, K., Hazumi, M., Hill, C., Holzapfel, W., Hori, Y., Howe, L., Inoue, Y., Irie, F., Jaehnig, G., Jaffe, A., Jeong, O., Katayama, N., Kaufman, J., Kazemzadeh, K., Keating, B., Kermish, Z., Keskitalo, R., Kisner, T., Kusaka, A., Jeune, M. Le, Lee, A., Leon, D., Linder, E., Lowry, L., Matsuda, F., Matsumura, T., Miller, N., Mizukami, K., Montgomery, J., Navaroli, M., Nishino, H., Peloton, J., Poletti, D., Puglisi, G., Rebeiz, G., Raum, C., Reichardt, C., Richards, P., Ross, C., Rotermund, K., Segawa, Y., Sherwin, B., Shirley, I., Siritanasak, P., Stebor, N., Stompor, R., Suzuki, J., Tajima, O., Takada, S., Takakura, S., Takatori, S., Tikhomirov, A., Tomaru, T., Westbrook, B., Whitehorn, N., Yamashita, T., Zahn, A. and Zahn, O. 2016. The Polarbear-2 and the Simons Array experiments. Journal of Low Temperature Physics 184 (3) , pp. 805-810. 10.1007/s10909-015-1425-4

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Abstract

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 mK. The focal plane is filled with 7588 dichroic lenslet–antenna-coupled polarization sensitive transition edge sensor (TES) bolometric pixels that are sensitive to 95 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 μ μ K CMB s √ CMBs 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, 150, 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 to σ(r)=6×10 −3 σ(r)=6×10−3 at r=0.1 r=0.1 and ∑m ν (σ=1) ∑mν(σ=1) to 40 meV.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Subjects:	Q Science > QB Astronomy Q Science > QC Physics
Publisher:	Springer
ISSN:	0022-2291
Date of Acceptance:	8 December 2015
Last Modified:	31 Oct 2022 10:43
URI:	https://orca.cardiff.ac.uk/id/eprint/85848

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