Polarized beam patterns from a multimoded feed for observations of the cosmic microwave background

Alan J. Kogut; Dale J. Fixsen

doi:10.1117/1.JATIS.4.1.014006

14 February 2018 Polarized beam patterns from a multimoded feed for observations of the cosmic microwave background

Alan J. Kogut, Dale J. Fixsen

Journal of Astronomical Telescopes, Instruments, and Systems, Vol. 4, Issue 1, 014006 (February 2018). https://doi.org/10.1117/1.JATIS.4.1.014006

Abstract

We measure linearly polarized beam patterns for a multimoded concentrator and compare the results to a simple model based on geometric optics. We convolve the measured copolar and crosspolar beams with simulated maps of cosmic microwave background (CMB) polarization to estimate the amplitude of the systematic error resulting from the crosspolar beam response. The uncorrected error signal has typical amplitude of 3 nK, corresponding to inflationary B-mode amplitude r∼10−3. Convolving the measured crosspolar beam pattern with maps of the CMB E-mode polarization provides a template for correcting the crosspolar response, reducing it to negligible levels.

CC BY: © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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Alan J. Kogut and Dale J. Fixsen "Polarized beam patterns from a multimoded feed for observations of the cosmic microwave background," Journal of Astronomical Telescopes, Instruments, and Systems 4(1), 014006 (14 February 2018). https://doi.org/10.1117/1.JATIS.4.1.014006

Received: 3 October 2017; Accepted: 22 January 2018; Published: 14 February 2018

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KEYWORDS

Polarization

Solar concentrators

Sensors

Optical testing

Microwave radiation

Fourier transforms

Solids

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