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The millimeter-wave bolometric interferometer (MBI)

Tucker, Gregory S., Korotkov, Andrei L., Gault, Amanda C., Hyland, Peter O., Malu, Siddharth, Timbie, Peter T., Bunn, Emory F., Keating, Brian G., Bierman, Evan, O'Sullivan, Creidhe, Ade, Peter A. R. and Piccirillo, Lucio 2008. The millimeter-wave bolometric interferometer (MBI). Presented at: Millimeter and Submillimeter Detectors and Instrumentation for Astronomy IV, Marseilles, France, 26 June 2008. Published in: Duncan, William D., Holland, Wayne S., Withington, Stafford and Zmuidzinas, Jonas eds. Proc. SPIE. SPIE, 70201M. 10.1117/12.788463

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Abstract

We report on the design and tests of a prototype of the Millimeter-wave Bolometric Interferometer (MBI). MBIis designed to make sensitive measurements of the polarization of the cosmic microwave background (CMB). Itcombines the differencing capabilities of an interferometer with the high sensitivity of bolometers at millimeterwavelengths. The prototype, which we call MBI-4, views the sky directly through four corrugated horn antennas.MBI ultimately will have ~ 1000 antennas. These antennas have low sidelobes and nearly symmetric beampatterns, so spurious instrumental polarization from reflective optics is avoided. The MBI-4 optical band isdefined by filters with a central frequency of 90 GHz. The set of baselines, determined by placement of the fourantennas, results in sensitivity to CMB polarization fluctuations over the multipole range ℓ = 150 - 270. Thesignals are combined with a Fizeau beam combiner and interference fringes are detected by an array of spider-webbolometers. In order to separate the visibility signals from the total power detected by each bolometer, thephase of the signal from each antenna is modulated by a ferrite-based waveguide phase shifter. Initial tests andobservations have been made at Pine Bluff Observatory (PBO) outside Madison, WI.

Item Type: Conference or Workshop Item (Paper)
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QC Physics
Publisher: SPIE
ISSN: 0277-786X
Last Modified: 04 Jun 2017 04:11
URI: http://orca.cf.ac.uk/id/eprint/34283

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