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We describe a space-borne, multi-band, multi-beam polarimeter aiming at a precise and accurate measurement of the polarization of the Cosmic Microwave Background. The
instrument is optimized to be compatible with the strict budget requirements of a mediumsize space mission within the Cosmic Vision Programme of the European Space Agency. The
instrument has no moving parts, and uses arrays of diffraction-limited Kinetic Inductance
Detectors to cover the frequency range from 60 GHz to 600 GHz in 19 wide bands, in the
focal plane of a 1.2 m aperture telescope cooled at 40 K, allowing for an accurate extraction
of the CMB signal from polarized foreground emission. The projected CMB polarization
survey sensitivity of this instrument, after foregrounds removal, is 1.7 µK·arcmin. The design
is robust enough to allow, if needed, a downscoped version of the instrument covering the
100 GHz to 600 GHz range with a 0.8 m aperture telescope cooled at 85 K, with a projected
CMB polarization survey sensitivity of 3.2 µK·arcmin
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