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

F. Ozturk, B. Maffei, G. Pisano, M. W. Ng, V. Haynes

    Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

    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. © 2012 SPIE.
    Original languageEnglish
    Title of host publicationProceedings of SPIE - The International Society for Optical Engineering|Proc SPIE Int Soc Opt Eng
    Place of PublicationAmsterdam
    Number of pages8
    Volume8452
    DOIs
    Publication statusPublished - 2012
    EventMillimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VI - Amsterdam
    Duration: 1 Jul 2012 → …

    Conference

    ConferenceMillimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VI
    CityAmsterdam
    Period1/07/12 → …

    Keywords

    • B-mode polarisation
    • Beams
    • CMB
    • Lens antennas
    • Systematic effects

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