Translator Disclaimer
Paper
5 October 2012 SWIPE: a bolometric polarimeter for the Large-Scale Polarization Explorer
Author Affiliations +
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.
© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
P. de Bernardis, S. Aiola, G. Amico, E. Battistelli, A. Coppolecchia, A. Cruciani, A. D' Addabbo, G. D' Alessandro, S. De Gregori, M. De Petris, D. Goldie, R. Gualtieri, V. Haynes, L. Lamagna, B. Maffei, S. Masi, F. Nati, M. Wah Ng, L. Pagano, F. Piacentini, L. Piccirillo, G. Pisano, G. Romeo, M. Salatino, A. Schillaci, E. Tommasi, and S. Withington "SWIPE: a bolometric polarimeter for the Large-Scale Polarization Explorer", Proc. SPIE 8452, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VI, 84523F (5 October 2012); https://doi.org/10.1117/12.926569
PROCEEDINGS
11 PAGES


SHARE
Advertisement
Advertisement
RELATED CONTENT

The EBEX experiment
Proceedings of SPIE (November 04 2004)
Near-infrared polarimeter for the Subaru telescope
Proceedings of SPIE (February 14 2003)
The POLARBEAR experiment
Proceedings of SPIE (September 24 2012)
The Primordial Inflation Polarization Explorer (PIPER)
Proceedings of SPIE (October 05 2012)

Back to Top