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The quest for primordial gravitational waves enclosed in the Cosmic MicrowaveBackground (CMB) polarization B-modes signal motivates the development of a newgeneration of high sensitive experiments (e.g. CMB-S4, LiteBIRD) that wouldallow them to detect its imprint.Neverthless, this will be only possible byensuring a high control of the instrumental systematic effects and an accurateabsolute calibration of the polarization angle. The Crab nebula is known to bea polarization calibrator on the sky for CMB experiments, already used for thePlanck satellite it exhibits a high polarized signal at microwave wavelengths.In this work we present Crab polarization observations obtained at the centralfrequency of 260 GHz with the NIKA2 instrument and discuss the accuracy neededon such a measurement to improve the constraints on the absolute anglecalibration for CMB experiments.

Crab nebula at 260 GHz with the NIKA2 polarimeter. Implications for the polarization angle calibration of future CMB experiments