Forecast analysis and focal plane optimization for a multi-frequency CMB B-modes polarization experiment: the case of LSPE

TL;DR

This paper develops an optimization scheme for the focal plane of a multi-frequency CMB B-modes experiment, specifically applied to LSPE, to improve the forecasted measurement precision of the tensor-to-scalar ratio.

Contribution

It introduces a novel optimization method for focal plane design based on forecasted uncertainties, tailored for multi-frequency CMB B-modes experiments like LSPE.

Findings

Optimized focal plane configurations reduce forecasted uncertainty in r.

Forecast analysis shows improved measurement precision for B-modes.

Method identifies optimal detector arrangements for foreground and noise mitigation.

Abstract

We present an optimization scheme for the focal plane of a multi-frequency CMB B-modes experiment with a fixed number of detectors and apply it to the specific case of LSPE experiment. Optimal focal planes are identified on the ground of different figures of merit defined in terms of the forecasted uncertainty $\sigma_r$ on the tensor--to-scalar ratio $r$ and the expected map variance from foreground and instrumental noise residuals. We then perform a forecast analysis in order to assess the precision achievable in B-modes measurements.