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2019ApJ...876...54D - Astrophys. J., 876, 54-54 (2019/May-1)

Intensity-coupled polarization in instruments with a continuously rotating half-wave plate.

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., HILLBRAND S., HUBMAYR J., JAFFE A., JONES T.J., KLEIN J., LEE A., LIMON M., MacDERMID K., MILLIGAN M., PASCALE E., REICHBORN-KJENNERUD B., SAGIV I., TUCKER C., TUCKER G.S. and ZILIC K.

Abstract (from CDS):

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.

Abstract Copyright: © 2019. The American Astronomical Society. All rights reserved.

Journal keyword(s): balloons - cosmic background radiation - instrumentation: polarimeters - methods: data analysis - polarization - techniques: polarimetric

Simbad objects: 1

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