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The Cosmic Microwave Background (CMB) radiation offers a unique window intothe early Universe, facilitating precise examinations of fundamentalcosmological theories. However, the quest for detecting B-modes in the CMB,predicted by theoretical models of inflation, faces substantial challenges interms of calibration and foreground modeling. The COSMOCal (COsmic Survey ofMillimeter wavelengths Objects for CMB experiments Calibration) project aims atenhancing the accuracy of the absolute calibration of the polarization angle$\psi$ of current and future CMB experiments. The concept includes the build ofa very well known artificial source emitting in the frequency range [20-350]GHz that would act as an absolute calibrator for several polarizationfacilities on Earth. A feasibility study to place the artificial source ingeostationary orbit, in the far field for all the telescopes on Earth, isongoing. In the meanwhile ongoing hardware work is dedicated to build aprototype to test the technology, the precision and the stability of thepolarization recovering in the 1 mm band (220-300 GHz). High-resolutionexperiments as the NIKA2 camera at the IRAM 30m telescope will be deployed forsuch use. Once carefully calibrated ($\Delta\psi$ < 0.1 degrees) it will beused to observe astrophysical sources such as the Crab nebula, which is thebest candidate in the sky for the absolute calibration of CMB experiments.

Polarization angle accuracy for future CMB experiments. The COSMOCal project and its prototype in the 1mm band