The Cosmic Background Imager | Zendy

S. Padin | Zendy; M. C. Shepherd | Zendy; J. K. Cartwright | Zendy; Reagan G. Keeney | Zendy; B. S. Mason | Zendy; T. J. Pearson | Zendy; A. C. S. Readhead | Zendy; W. Schaal | Zendy; Jonathan Sievers | Zendy; P. S. Udomprasert | Zendy; Jorge Yamasaki | Zendy; W. L. Holzapfel | Zendy; J. E. Carlstrom | Zendy; M. Joy | Zendy; S. T. Myers | Zendy; Ángel Otarola | Zendy

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The Cosmic Background Imager

Author(s) -

S. Padin,

M. C. Shepherd,

J. K. Cartwright,

Reagan G. Keeney,

B. S. Mason,

T. J. Pearson,

A. C. S. Readhead,

W. Schaal,

Jonathan Sievers,

P. S. Udomprasert,

Jorge Yamasaki,

W. L. Holzapfel,

J. E. Carlstrom,

M. Joy,

S. T. Myers,

Ángel Otarola

Publication year - 2002

Publication title -

publications of the astronomical society of the pacific

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.294

H-Index - 172

eISSN - 1538-3873

pISSN - 0004-6280

DOI - 10.1086/324786

Subject(s) - physics , cosmic microwave background , polarization (electrochemistry) , interferometry , optics , antenna (radio) , microwave , spectral index , remote sensing , astronomy , computer science , telecommunications , spectral line , geology , chemistry , anisotropy , quantum mechanics

Design and performance details are given for the Cosmic Background Imager(CBI), an interferometer array that is measuring the power spectrum offluctuations in the cosmic microwave background radiation (CMBR) for multipolesin the range 400 < l < 3500. The CBI is located at an altitude of 5000 m in theAtacama Desert in northern Chile. It is a planar synthesis array with 13 0.9-mdiameter antennas on a 6-m diameter tracking platform. Each antenna has acooled, low-noise receiver operating in the 26-36 GHz band. Signals arecross-correlated in an analog filterbank correlator with ten 1 GHz bands. Thisallows spectral index measurements which can be used to distinguish CMBRsignals from diffuse galactic foregrounds. A 1.2 kHz 180-deg phase switchingscheme is used to reject cross-talk and low-frequency pick-up in the signalprocessing system. The CBI has a 3-axis mount which allows the trackingplatform to be rotated about the optical axis, providing improved (u,v)coverage and a powerful discriminant against false signals generated in thereceiving electronics. Rotating the tracking platform also permits polarizationmeasurements when some of the antennas are configured for the orthogonalpolarization.

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