3 years ago

Intensity-Coupled-Polarization in Instruments with a Continuously Rotating Half-Wave Plate.

Will Grainger, Asad M. Aboobaker, François Aubin, Karl Young, Carlo Baccigalupi, Kyle Zilic, Britt Reichborn-Kjennerud, Shaul Hanany, Kyle Helson, Gregory S. Tucker, Amber D. Miller, Johannes Hubmayr, Benjamin Westbrook, Peter Ade, Andrei Korotkov, Adrian Lee, Joy Didier, Kevin MacDermid, Chaoyun Bao, Enzo Pascale, Carole Tucker, Seth Hillbrand, Christopher Geach, Kate Raach, Bradley Johnson, Lorenzo Moncelsi, Michael Milligan, Jeff Klein, Matt Dobbs, Terry Jones, Lorne Levinson, Andrew Jaffe, Michele Limon, Daniel Chapman, Ilan Sagiv, Derek Araujo

We discuss a systematic effect associated with measuring the polarization of the Cosmic Microwave Background (CMB) with a continuously rotating Half-Wave Plate (HWP) using data from the E and B Experiment (EBEX). EBEX was a balloon-borne telescope designed to measure the polarization of the CMB as well as that from Galactic dust. We show that EBEX measured excess polarization coupled to intensity, and provide a model for the origin of this polarization involving detector non-linearity in the presence of a continuously rotating HWP. We provide a map-based method to remove the excess polarization, showing 81 (92) \% of the excess polarization was removed on the CMB in the 150 (250)~GHz datasets. Characterization and mitigation of this effect is important for future experiments aiming to measure the CMB B-modes on large angular scales using a HWP.

Publisher URL: http://arxiv.org/abs/1711.01314

DOI: arXiv:1711.01314v1

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