Intensity-coupled Polarization in Instruments with a Continuously Rotating Half-wave Plate
Intensity-coupled Polarization in Instruments with a Continuously Rotating Half-wave Plate
复制标题
具有连续旋转半波片的仪器中的强度耦合偏振
作者：
J. Didier;Amber D. Miller;D. Araujo;F. Aubin;C. Geach;Bradley R. Johnson;A. Korotkov;K. Raach;B. Westbrook;K. Young;A. Aboobaker;P. Ade;C. Baccigalupi;C. Bao;D. Chapman;M. Dobbs;W. Grainger;S. Hanany;K. Helson;S. Hillbrand;J. Hubmayr;A. Jaffe;T. Jones;J. Klein;Adrian T. Lee;M. Limon;K. MacDermid;M. Milligan;E. Pascale;B. Reichborn;I. Sagiv;C. Tucker;G. Tucker;K. Zilic
本文讨论了用连续旋转半波片（HWP）测量偏振态时的系统效应。E和B实验的数据证实了这一效应，该实验是一种气球携带的仪器，旨在测量宇宙微波背景（CMB）以及银河尘埃的偏振。数据显示极化分数大于10%，而仪器极化预期小于3%。我们给出的证据表明，过量的偏振是由于检测器的非线性存在下，一个连续旋转的HWP。非线性将强度信号耦合到偏振。我们开发了一种基于地图的方法来消除多余的偏振。将此方法应用于150（250）GHz频段的数据，我们发现，81%（92%）的过量极化被删除。表征和缓解这种影响是重要的，为未来的实验，旨在测量的CMB B-模式与连续旋转HWP。
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.
影响因子：
8.7
作者：
Komatsu, E.;Smith, K. M.;Wright, E. L.
通讯作者：
Wright, E. L.