Optical modeling and polarization calibration for CMB measurements with ACTPol and Advanced ACTPol

Abstract

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.

arXiv comment12 pages, 8 figures, conference proceedings submitted to Proceedings of SPIE; added reference in section 2 and merged repeated reference

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Cited by in corpus (13)

• The Atacama Cosmology Telescope: DR4 Maps and Cosmological Parameters
• The Atacama Cosmology Telescope: A Measurement of the Cosmic Microwave Background Power Spectra at 98 and 150 GHz
• The Atacama Cosmology Telescope: Two-Season ACTPol Spectra and Parameters
• The Atacama Cosmology Telescope: Constraints on Cosmic Birefringence
• POLOCALC: a Novel Method to Measure the Absolute Polarization Orientation of the Cosmic Microwave Background
• CMB Mode Coupling with Isotropic Polarization Rotation
• An Examination of Galactic Polarization with Application to the Planck TB Correlation
• Optical modeling of systematic uncertainties in detector polarization angles for the Atacama Cosmology Telescope
• Studies of Systematic Uncertainties for Simons Observatory: Optical Effects and Sensitivity Considerations
• Cosmology Large Angular Scale Surveyor (CLASS): 90 GHz Telescope Pointing, Beam Profile, Window Function, and Polarization Performance
• Geometrical and physical optics analysis for mm-wavelength refractor telescopes designed to map the cosmic microwave background
• Breaking the degeneracy between polarization efficiency and cosmological parameters in CMB experiments
• Polarization angle requirements for CMB B-mode experiments. Application to the LiteBIRD satellite