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Authors: de Bernardis, P.*
Aiola, S.*
Amico, G.*
Battistelli, E.*
Coppolecchia, A.*
Cruciani, A.*
D’ Addabbo, A.*
D' Alessandro, G.*
De Gregori, S.*
De Petris, M.*
Goldie, D.*
Gualtieri, R.*
Haynes, V.*
Lamagna, L.*
Maffei, B.*
Masi, S.*
Nati, F.*
Wah Ng, M.*
Pagano, L.*
Piacentini, F.*
Piccirillo, L.*
Pisano, G.*
Romeo, G*
Salatino, M.*
Schillaci, A.*
Tommasi, E.*
Tommasi, E.*
Withington, S.*
Title: SWIPE: a bolometric polarimeter for the Large-Scale Polarization Explorer
Title of journal: Proceedings of the SPIE Astronomical Telescopes + Instrumentation 2012 Conference - Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VI - Amsterdam 1-6 July 2012
Series/Report no.: / 8452 (2012)
Issue Date: 2012
DOI: 10.1117/12.926569
Keywords: Cosmic Microwave Backgorund
Polarization, Bolometer
Overmoded Microwave Optics
Abstract: The balloon-borne LSPE mission is optimized to measure the linear polarization of the Cosmic Microwave Background at large angular scales. The Short Wavelength Instrument for the Polarization Explorer (SWIPE) is composed of 3 arrays of multi-mode bolometers cooled at 0.3K , with optical components and filters cryogenically cooled below 4K to reduce the background on the detectors. Polarimetry is achieved by means of large rotating half-wave plates and wire-grid polarizers in front of the arrays. The polarization modulator is the first component of the optical chain, reducing significantly the effect of instrumental polarization. In SWIPE we trade angular resolution for sensitivity. The diameter of the entrance pupil of the refractive telescope is 45 cm, while the field optics is optimized to collect tens of modes for each detector, thus boosting the absorbed power. This approach results in a FWHM resolution of 1.8, 1.5, 1.2 degrees at 95, 145, 245 GHz respectively. The expected performance of the three channels is limited by photon noise, resulting in a final sensitivity around 0.1-0.2 μK per beam, for a 13 days survey covering 25% of the sky
Description: In press. Copyright 2012 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited
Appears in Collections:05.04.99. General or miscellaneous
Papers Published / Papers in press

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