e-Article
The Polarbear-2 and the Simons Array Experiments
Document Type
article
Author
Suzuki, A; Ade, P; 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; Zahn, O
Source
Journal of Low Temperature Physics. 184(3-4)
Subject
Language
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 KCMBs 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 at r= 0.1 and ∑ mν(σ= 1) to 40 meV.