Share Email Print
cover

Journal of Astronomical Telescopes, Instruments, and Systems • Open Access • new

Polarized beam patterns from a multimoded feed for observations of the cosmic microwave background
Author(s): Alan J. Kogut; Dale J. Fixsen

Paper 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.

Paper Details

Date Published: 14 February 2018
PDF: 7 pages
J. Astron. Telesc. Instrum. Syst. 4(1) 014006 doi: 10.1117/1.JATIS.4.1.014006
Published in: Journal of Astronomical Telescopes, Instruments, and Systems Volume 4, Issue 1
Show Author Affiliations
Alan J. Kogut, NASA Goddard Space Flight Ctr. (United States)
Dale J. Fixsen, NASA Goddard Space Flight Ctr. (United States)
Univ. of Maryland, College Park (United States)


© SPIE. Terms of Use
Back to Top