The bolometric focal plane array of the Polarbear CMB experiment

K. Arnold (1); P.A.R. Ade (2); A.E. Anthony (3); D. Barron (4) D.; Boettger (4); J. Borrill (5,6); S. Chapman (7) Y. Chinone (11); M.A. Dobbs; (8); J. Errard (10); G. Fabbian (10); D. Flanigan (1); G. Fuller (4); A.; Ghribi (1); W. Grainger (13); N. Halverson (3); M. Hasegawa (11); K. Hattori; (11) M. Hazumi (11); W.L. Holzapfel (1); J. Howard (1); P. Hyland (9); A.; Jaffe (12); B. Keating (4); Z. Kermish (1); T. Kisner (5); M. Le Jeune (10),; A.T. Lee (1,12); E. Linder (13); M. Lungu (1); F. Matsuda (4); T. Matsumura; (11); N.J. Miller (4); X. Meng (1); H. Morii (11); S. Moyerman (4); M.J.; Myers (1); H. Nishino (1); H. Paar (4); E. Quealy (1); C. Reichardt (1); P.L.; Richards (1); C. Ross (7); A. Shimizu (11) C. Shimmin (1); M. Shimon (4); M.; Sholl (12); P. Siritanasak (4); H. Spieler (12); N. Stebor (4); B. Steinbach; (1); R. Stompor (10); A. Suzuki (1); T. Tomaru (11); C. Tucker (2); O. Zahn; (1,12) ((1) Department of Physics; University of California; (2) School of; Physics; Astronomy; University of Cardiff; (3) Department of Astrophysical; and Planetary Sciences; University of Colorado; (4) Center for Astrophysics; and Space Sciences; University of California; San Diego; (5) Computational; Cosmology Center; Lawrence Berkeley National Laboratory; (6) Space Sciences; Laboratory; University of California; Berkeley; (7) Dalhousie University; (8); Physics Department; McGill University; (9) Physics Department; Austin; College; (10) Laboratoire Astroparticule et Cosmologie (APC); Universite; Paris; (11) High Energy Accelerator Research Organization (KEK); Tsukuba,; Ibaraki; Japan; (12) Department of Physics; Imperial College; (12) Physics; Division; Lawrence Berkeley National Laboratory; (13) Rutherford Appleton; Laboratory; STFC)

arXiv:1210.7877·astro-ph.IM·June 11, 2015

The bolometric focal plane array of the Polarbear CMB experiment

K. Arnold (1), P.A.R. Ade (2), A.E. Anthony (3), D. Barron (4) D., Boettger (4), J. Borrill (5,6), S. Chapman (7) Y. Chinone (11), M.A. Dobbs, (8), J. Errard (10), G. Fabbian (10), D. Flanigan (1), G. Fuller (4), A., Ghribi (1), W. Grainger (13), N. Halverson (3)

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TL;DR

This paper describes the design and initial characterization of the bolometric focal plane array used in the Polarbear CMB experiment, which aims to detect B-mode polarization signals related to gravitational lensing and inflation.

Contribution

It introduces a novel detector architecture with polarization-sensitive antenna-coupled bolometers and presents initial performance results of the focal plane.

Findings

01

Successful initial characterization of the detector array

02

Demonstration of the unique dielectric lenslet coupling architecture

03

Potential for sensitive measurements of CMB polarization signals

Abstract

The Polarbear Cosmic Microwave Background (CMB) polarization experiment is currently observing from the Atacama Desert in Northern Chile. It will characterize the expected B-mode polarization due to gravitational lensing of the CMB, and search for the possible B-mode signature of inflationary gravitational waves. Its 250 mK focal plane detector array consists of 1,274 polarization-sensitive antenna-coupled bolometers, each with an associated lithographed band-defining filter. Each detector's planar antenna structure is coupled to the telescope's optical system through a contacting dielectric lenslet, an architecture unique in current CMB experiments. We present the initial characterization of this focal plane.

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