Intensity-coupled Polarization in Instruments with a Continuously Rotating Half-wave Plate

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

doi:10.3847/1538-4357/ab0f36

Intensity-coupled Polarization in Instruments with a Continuously Rotating Half-wave Plate

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

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Abstract

We discuss a systematic effect associated with measuring polarization with a continuously rotating half-wave plate (HWP). The effect was identified with the data from the E and B Experiment, which was a balloon-borne instrument designed to measure the polarization of the cosmic microwave background (CMB) as well as that from Galactic dust. The data show polarization fractions larger than 10%, while less than 3% were expected from instrumental polarization. We give evidence that the excess polarization is due to detector nonlinearity in the presence of a continuously rotating HWP. The nonlinearity couples intensity signals to polarization. We develop a map-based method to remove the excess polarization. Applying this method to the 150 (250) GHz band data, we find that 81% (92%) of the excess polarization was removed. Characterization and mitigation of this effect are important for future experiments aiming to measure the CMB B-modes with a continuously rotating HWP.

Original language	English (US)
Article number	54
Journal	Astrophysical Journal
Volume	876
Issue number	1
DOIs	https://doi.org/10.3847/1538-4357/ab0f36
State	Published - May 1 2019

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© 2019. The American Astronomical Society. All rights reserved.

Keywords

balloons
cosmic background radiation
instrumentation: polarimeters
methods: data analysis
polarization
techniques: polarimetric

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10.3847/1538-4357/ab0f36

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Didier, J., Miller, A. D., Araujo, D., Aubin, F., Geach, C., Johnson, B., Korotkov, A., Raach, K., Westbrook, B., Young, K., Aboobaker, A. M., Ade, P., Baccigalupi, C., Bao, C., Chapman, D., Dobbs, M., Grainger, W., Hanany, S., Helson, K., ... Zilic, K. (2019). Intensity-coupled Polarization in Instruments with a Continuously Rotating Half-wave Plate. Astrophysical Journal, 876(1), Article 54. https://doi.org/10.3847/1538-4357/ab0f36

Didier, J, Miller, AD, Araujo, D, Aubin, F, Geach, C, Johnson, B, Korotkov, A, Raach, K, Westbrook, B, Young, K, Aboobaker, AM, Ade, P, Baccigalupi, C, Bao, C, Chapman, D, Dobbs, M, Grainger, W, Hanany, S, Helson, K, Hillbrand, S, Hubmayr, J, Jaffe, A, Jones, TJ, Klein, J, Lee, A, Limon, M, Macdermid, K, Milligan, M, Pascale, E, Reichborn-Kjennerud, B, Sagiv, I, Tucker, C, Tucker, GS & Zilic, K 2019, 'Intensity-coupled Polarization in Instruments with a Continuously Rotating Half-wave Plate', Astrophysical Journal, vol. 876, no. 1, 54. https://doi.org/10.3847/1538-4357/ab0f36

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abstract = "We discuss a systematic effect associated with measuring polarization with a continuously rotating half-wave plate (HWP). The effect was identified with the data from the E and B Experiment, which was a balloon-borne instrument designed to measure the polarization of the cosmic microwave background (CMB) as well as that from Galactic dust. The data show polarization fractions larger than 10%, while less than 3% were expected from instrumental polarization. We give evidence that the excess polarization is due to detector nonlinearity in the presence of a continuously rotating HWP. The nonlinearity couples intensity signals to polarization. We develop a map-based method to remove the excess polarization. Applying this method to the 150 (250) GHz band data, we find that 81% (92%) of the excess polarization was removed. Characterization and mitigation of this effect are important for future experiments aiming to measure the CMB B-modes with a continuously rotating HWP.",

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AU - Aubin, François

AU - Geach, Christopher

AU - Johnson, Bradley

AU - Korotkov, Andrei

AU - Raach, Kate

AU - Westbrook, Benjamin

AU - Young, Karl

AU - Aboobaker, Asad M.

AU - Ade, Peter

AU - Baccigalupi, Carlo

AU - Bao, Chaoyun

AU - Chapman, Daniel

AU - Dobbs, Matt

AU - Grainger, Will

AU - Hanany, Shaul

AU - Helson, Kyle

AU - Hillbrand, Seth

AU - Hubmayr, Johannes

AU - Jaffe, Andrew

AU - Jones, Terry J.

AU - Klein, Jeff

AU - Lee, Adrian

AU - Limon, Michele

AU - Macdermid, Kevin

AU - Milligan, Michael

AU - Pascale, Enzo

AU - Reichborn-Kjennerud, Britt

AU - Sagiv, Ilan

AU - Tucker, Carole

AU - Tucker, Gregory S.

AU - Zilic, Kyle

PY - 2019/5/1

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N2 - We discuss a systematic effect associated with measuring polarization with a continuously rotating half-wave plate (HWP). The effect was identified with the data from the E and B Experiment, which was a balloon-borne instrument designed to measure the polarization of the cosmic microwave background (CMB) as well as that from Galactic dust. The data show polarization fractions larger than 10%, while less than 3% were expected from instrumental polarization. We give evidence that the excess polarization is due to detector nonlinearity in the presence of a continuously rotating HWP. The nonlinearity couples intensity signals to polarization. We develop a map-based method to remove the excess polarization. Applying this method to the 150 (250) GHz band data, we find that 81% (92%) of the excess polarization was removed. Characterization and mitigation of this effect are important for future experiments aiming to measure the CMB B-modes with a continuously rotating HWP.

AB - We discuss a systematic effect associated with measuring polarization with a continuously rotating half-wave plate (HWP). The effect was identified with the data from the E and B Experiment, which was a balloon-borne instrument designed to measure the polarization of the cosmic microwave background (CMB) as well as that from Galactic dust. The data show polarization fractions larger than 10%, while less than 3% were expected from instrumental polarization. We give evidence that the excess polarization is due to detector nonlinearity in the presence of a continuously rotating HWP. The nonlinearity couples intensity signals to polarization. We develop a map-based method to remove the excess polarization. Applying this method to the 150 (250) GHz band data, we find that 81% (92%) of the excess polarization was removed. Characterization and mitigation of this effect are important for future experiments aiming to measure the CMB B-modes with a continuously rotating HWP.

KW - balloons

KW - cosmic background radiation

KW - instrumentation: polarimeters

KW - methods: data analysis

KW - polarization

KW - techniques: polarimetric

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Intensity-coupled Polarization in Instruments with a Continuously Rotating Half-wave Plate

Abstract

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