The effect of a scanning flat fold mirror on a CMB B-mode experiment
William F. Grainger, Chris E. North, Peter A. R. Ade
TL;DR
This paper explores using a flat-fold mirror in a CMB B-mode experiment, analyzing its polarization effects, simulating scanning impacts, and proposing correction methods to mitigate systematic errors.
Contribution
It demonstrates the polarization effects of a flat-fold mirror and presents a simulation-based correction approach for CMB B-mode measurements.
Findings
Flat-fold mirror introduces ~0.075% polarization.
Polarization varies synchronously with scan pattern.
Correction methods can mitigate polarization effects.
Abstract
We investigate the possibility of using a flat-fold beam steering mirror for a CMB B-mode experiment. An aluminium flat-fold mirror is found to add 0.075% polarization, which varies in a scan synchronous way. Time-domain simulations of a realistic scanning pattern are performed, and the effect on the power-spectrum illustrated and a possible method of correction applied.
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