Polarization angle requirements for CMB B-mode experiments. Application to the LiteBIRD satellite

Understand

A methodology to provide the polarization angle requirements for different sets of detectors, at a given frequency of a CMB polarization experiment, is presented.

• The uncertainties in the polarization angle of each detector set are related to a given bias on the tensor-to-scalar ratio $r$ parameter.
• The approach is grounded in using a linear combination of the detector sets to obtain the CMB polarization signal.
• In addition, assuming that the uncertainties on the polarization angle are in the small angle limit (lower than a few degrees), it is possible to derive analytic expressions to establish the requirements.