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Proceedings Paper

The millimeter-wave bolometric interferometer
Author(s): Andrei L. Korotkov; Jaiseung Kim; Gregory S. Tucker; Amanda Gault; Peter Hyland; Siddharth Malu; Peter T. Timbie; Emory F. Bunn; Evan Bierman; Brian Keating; Anthony Murphy; Créidhe O'Sullivan; Peter A. R. Ade; Carolina Calderon; Lucio Piccirillo
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Paper Abstract

The Millimeter-Wave Bolometric Interferometer (MBI) is designed for sensitive measurements of the polarization of the cosmic microwave background (CMB). MBI combines the differencing capabilities of an interferometer with the high sensitivity of bolometers at millimeter wavelengths. It views the sky directly through corrugated horn antennas with low sidelobes and nearly symmetric beam patterns to avoid spurious instrumental polarization from reflective optics. The design of the first version of the instrument with four 7-degree-FOV corrugated horns (MBI-4) is discussed. The MBI-4 optical band is defined by filters with a central frequency of 90 GHz. The set of baselines determined by the antenna separation makes the instrument sensitive to CMB polarization fluctuations over the multipole range l=150-270. In MBI-4, the signals from antennas are combined with a Fizeau beam combiner and interference fringes are detected by an array of spider-web bolometers with NTD germanium thermistors. In order to separate the visibility signals from the total power detected by each bolometer, the phase of the signal from each antenna is modulated by a ferrite-based waveguide phase shifter. Observations are planned from the Pine Bluff Observatory outside Madison, WI.

Paper Details

Date Published: 27 June 2006
PDF: 9 pages
Proc. SPIE 6275, Millimeter and Submillimeter Detectors and Instrumentation for Astronomy III, 62750X (27 June 2006);
Show Author Affiliations
Andrei L. Korotkov, Brown Univ. (United States)
Jaiseung Kim, Brown Univ. (United States)
Gregory S. Tucker, Brown Univ. (United States)
Amanda Gault, Univ. of Wisconsin (United States)
Peter Hyland, Univ. of Wisconsin (United States)
Siddharth Malu, Univ. of Wisconsin (United States)
Peter T. Timbie, Univ. of Wisconsin (United States)
Emory F. Bunn, Univ. of Richmond (United States)
Evan Bierman, Univ. of California, San Diego (United States)
Brian Keating, Univ. of California, San Diego (United States)
Anthony Murphy, National Univ. of Ireland, Maynooth (Ireland)
Créidhe O'Sullivan, National Univ. of Ireland, Maynooth (Ireland)
Peter A. R. Ade, Univ. of Wales (United Kingdom)
Carolina Calderon, Univ. of Wales (United Kingdom)
Lucio Piccirillo, Univ. of Wales (United Kingdom)

Published in SPIE Proceedings Vol. 6275:
Millimeter and Submillimeter Detectors and Instrumentation for Astronomy III
Jonas Zmuidzinas; Wayne S. Holland; Stafford Withington; William D. Duncan, Editor(s)

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