Systematic effects introduced by lenses at mm-wavelengths in CMB applications

Holland, Wayne S., Ozturk, F., Maffei, Bruno, Pisano, Giampaolo ORCID: https://orcid.org/0000-0003-4302-5681, Ng, M. W. and Haynes, V. 2012. Systematic effects introduced by lenses at mm-wavelengths in CMB applications. Presented at: Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VI, Amsterdam, The Netherlands, 3-6 July 2012. Published in: Holland, Wayne S. and Zmuidzinas, Jonas eds. Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VI (Proceedings). Proceedings of the SPIE , vol.8452 Bellingham, WA: SPIE, 84520I. 10.1117/12.926384

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Abstract

Telescopes for the next generation of CMB (Cosmic Microwave Background) experiments could be based on either reflective (such as Planck, Clover) or refractive optics (BICEP, LSPE, SPIDER). Both techniques have advantages and disadvantages. On-axis lens based telescopes can be compact while off-axis reflective configurations can be large. The RF performances of mirror based telescopes are very well understood, whereas lens based systems have a lower technology readiness level: specifically, the systematic effects (aberrations such as chromaticity, birefringence, losses, standing waves and cross-polarisation) that they can introduce need to be accurately quantified at millimetre-wave. This paper reports on both RF modelling and preliminary experimental studies of a lens coupled to a feed-horn antenna for which the co- and cross-polarisation beam patterns are characterised.

Item Type:	Conference or Workshop Item (Paper)
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Subjects:	Q Science > QB Astronomy
Uncontrolled Keywords:	Lenses; Polarization; Telescopes; Antennas; Birefringence; Mirrors; Modeling; Optics
Publisher:	SPIE
ISBN:	9780819491534
ISSN:	0277-786X
Related URLs:	Publisher
Last Modified:	25 Oct 2022 09:55
URI:	https://orca.cardiff.ac.uk/id/eprint/60495

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