SiFAP4XP is a new COTS PI instrument mounted at the TNG aimed at observing in the visible band some polarimetric objects simultaneously to IXPE. SiFAP4XP is an experience-based improvement over the previous version of the photometer SiFAP2 currently mounted at the F/11 focus of the TNG. SiFAP4XP takes advantage of the already installed polarimetric unit of Dolores, called PAOLO, based on a double Wollaston prism to split the 4 polarization parameters. Four pairs of Silicon MPPCs are mounted on both sides of a small optical bench and each pair of detectors receives from PAOLO the polarized light of the target and of the nearby sky through 8 optical relays. Another relay is dedicated to A&G. The control electronics are based on Red-Pitayas for photon counting, on GPS disciplined clocks for time tagging the photons with a resolution of 8ns. First light is scheduled for the end of February 2022.
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