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The Robinson Gravitational Wave Background Telescope (BICEP): a bolometric large angular scale CMB polarimeter

Yoon, K. W., Ade, Peter A. R., Barkats, D., Battle, J. O., Bierman, E. M., Bock, J. J., Brevik, J. A., Chiang, H. C., Crites, A., Dowell, C. D., Duband, L., Griffin, G. S., Hivon, E. F., Holzapfel, W. L., Hristov, V. V., Keating, B. G., Kovac, J. M., Kuo, C. L., Lange, A. E., Leitch, E. M., Mason, P. V., Nguyen, H. T., Pontthieu, N., Takahashi, Y. D., Renbarger, T., Weintraub, L. C. and Woolsey, D. 2006. The Robinson Gravitational Wave Background Telescope (BICEP): a bolometric large angular scale CMB polarimeter. Presented at: Millimeter and Submillimeter Detectors and Instrumentation for Astronomy III, Orlando, FL, 29-31 May, 2006. Published in: Zmuidzinas, Jonas, Holland, Wayne S. and Withington, Stafford eds. Millimeter and Submillimeter Detectors and Instrumentation for Astronomy III: 29-31 May, 2006, Orlando, Florida, USA,. Proceedings of SPIE , vol. 6275. Bellingham WA: SPIE, 62751K. 10.1117/12.672652

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Abstract

The Robinson Telescope (BICEP) is a ground-based millimeter-wave bolometric array designed to study the polarization of the cosmic microwave background radiation (CMB) and galactic foreground emission. Such measurements probe the energy scale of the inflationary epoch, tighten constraints on cosmological parameters, and verify our current understanding of CMB physics. Robinson consists of a 250-mm aperture refractive telescope that provides an instantaneous field-of-view of 17° with angular resolution of 55' and 37' at 100 GHz and 150 GHz, respectively. Forty-nine pair of polarization-sensitive bolometers are cooled to 250 mK using a 4He/3He/3He sorption fridge system, and coupled to incoming radiation via corrugated feed horns. The all-refractive optics is cooled to 4 K to minimize polarization systematics and instrument loading. The fully steerable 3-axis mount is capable of continuous boresight rotation or azimuth scanning at speeds up to 5 deg/s. Robinson has begun its first season of observation at the South Pole. Given the measured performance of the instrument along with the excellent observing environment, Robinson will measure the E-mode polarization with high sensitivity, and probe for the B-modes to unprecedented depths. In this paper we discuss aspects of the instrument design and their scientific motivations, scanning and operational strategies, and the results of initial testing and observations.

Item Type: Conference or Workshop Item (Paper)
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Uncontrolled Keywords: Bolometers; Equipment and services; Extremely high frequency; Optics; Physics; Polarization; Radiation; Scanning; Spatial resolution; Telescopes
Publisher: SPIE
ISBN: 9780819463401
Last Modified: 04 Jun 2017 04:34
URI: http://orca.cf.ac.uk/id/eprint/41184

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