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The Large-Scale Polarization Explorer (LSPE)

McLean, I. S., Aiola, S., Amico, G., Battaglia, P., Battistelli, E., Baù, A., de Bernardis, P., Bersanelli, M., Boscaleri, A., Cavaliere, F., Coppolecchia, A., Cruciani, A., Cuttaia, F., D' Addabbo, A., D' Alessandro, G., De Gregori, S., Del Torto, F., De Petris, M., Fiorineschi, L., Franceschet, C., Franceschi, E., Gervasi, M., Goldie, D., Gregorio, A., Haynes, V., Krachmalnicoff, N., Lamagna, L., Maffei, Bruno, Maino, D., Masi, S., Mennella, A., Morgante, G., Nati, F., Ng, M. W., Pagano, L., Passerini, A., Peverini, O., Piacentini, F., Piccirillo, Lucio, Pisano, Giampaolo, Ricciardi, S., Rissone, P., Romeo, G., Salatino, M., Sandri, M., Schillaci, A., Stringhetti, L., Tartari, A., Tascone, R., Terenzi, L., Tomasi, M., Tommasi, E., Villa, F., Virone, G., Withington, S., Zacchei, A., Zannoni, M., Ramsay, S. K. and Takami, H. 2012. The Large-Scale Polarization Explorer (LSPE). Presented at: Ground-based and Airborne Instrumentation for Astronomy IV, Amsterdam, Netherlands, 1–6 July 2012. Published in: McLean, Ian S., Ramsay, Suzanne K. and Takami, Hideki eds. Ground-based and Airborne Instrumentation for Astronomy IV (Proceedings). Proceedings of the SPIE Bellingham, WA: SPIE, 84467A. 10.1117/12.926095

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The LSPE is a balloon-borne mission aimed at measuring the polarization of the Cosmic Microwave Background (CMB) at large angular scales, and in particular to constrain the curl component of CMB polarization (B-modes) produced by tensor perturbations generated during cosmic inflation, in the very early universe. Its primary target is to improve the limit on the ratio of tensor to scalar perturbations amplitudes down to r = 0.03, at 99.7% confidence. A second target is to produce wide maps of foreground polarization generated in our Galaxy by synchrotron emission and interstellar dust emission. These will be important to map Galactic magnetic fields and to study the properties of ionized gas and of diffuse interstellar dust in our Galaxy. The mission is optimized for large angular scales, with coarse angular resolution (around 1.5 degrees FWHM), and wide sky coverage (25% of the sky). The payload will fly in a circumpolar long duration balloon mission during the polar night. Using the Earth as a giant solar shield, the instrument will spin in azimuth, observing a large fraction of the northern sky. The payload will host two instruments. An array of coherent polarimeters using cryogenic HEMT amplifiers will survey the sky at 43 and 90 GHz. An array of bolometric polarimeters, using large throughput multi-mode bolometers and rotating Half Wave Plates (HWP), will survey the same sky region in three bands at 95, 145 and 245 GHz. The wide frequency coverage will allow optimal control of the polarized foregrounds, with comparable angular resolution at all frequencies.

Item Type: Conference or Workshop Item (Paper)
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Uncontrolled Keywords: Polarization; Spatial resolution; Polarimetry; Equipment and services; Field effect transistors; Magnetism; Amplifiers; Bolometers; Wave plates
Publisher: SPIE
ISBN: 9780819491473
ISSN: 0277-786X
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Last Modified: 18 Jan 2018 20:47

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