The Atacama Cosmology Telescope Polarimeter (ACTPol) is a polarization sensitive upgrade to the Atacama Cosmology Telescope. Located at an elevation of 5190 m, ACTPol measures the Cosmic Microwave Background (CMB) temperature and polarization with arcminute-scale angular resolution. Calibration of the detector angles is a critical step in producing maps of the CMB polarization. Polarization angle offsets in the detector calibration can cause leakage in polarization from E to B modes and induce a spurious signal in the EB and TB cross correlations, which eliminates our ability to measure potential cosmological sources of EB and TB signals, such as cosmic birefringence. We present our optical modeling and measurements associated with calibrating the detector angles in ACTPol.
@article{arxiv.1607.01825,
title = {Optical modeling and polarization calibration for CMB measurements with ACTPol and Advanced ACTPol},
author = {Brian Koopman and Jason Austermann and Hsiao-Mei Cho and Kevin P. Coughlin and Shannon M. Duff and Patricio A. Gallardo and Matthew Hasselfield and Shawn W. Henderson and Shuay-Pwu Patty Ho and Johannes Hubmayr and Kent D. Irwin and Dale Li and Jeff McMahon and Federico Nati and Michael D. Niemack and Laura Newburgh and Lyman A. Page and Maria Salatino and Alessandro Schillaci and Benjamin L. Schmitt and Sara M. Simon and Eve M. Vavagiakis and Jonathan T. Ward and Edward J. Wollack},
journal= {arXiv preprint arXiv:1607.01825},
year = {2017}
}
Comments
12 pages, 8 figures, conference proceedings submitted to Proceedings of SPIE; added reference in section 2 and merged repeated reference