Neff and Beam Calibration

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Dan writing (input from Tom Crawford, Matthew Hasselfield, Christian Reichardt and Alex van Engelen )

This is an extension of the beam calibration discussion to an earlier post: Update on Neff Forecasts. The main point of this new post is to use the ACT beam eigenmodes directly, rather than a much simpler parameterization of the beam uncertainty. Using the beam eigenmodes will given an unambiguous comparison between the calibration requirements needed to reach σ(Neff) = 0.027 and the calibration levels that have been achieved in ACT (for example).

The forecasts used here use the same parameters as the earlier post, including point-sources and atmosphere.

ACT Beam Eigenmodes