MULERI, FABIOFABIOMULERILEFEVRE, CARLOCARLOLEFEVREPIAZZOLLA, RAFFAELERAFFAELEPIAZZOLLAMORBIDINI, AlfredoAlfredoMORBIDINIAMICI, FABRIZIOFABRIZIOAMICIATTINA', PRIMOPRIMOATTINA'CENTRONE, MauroMauroCENTRONEDEL MONTE, EttoreEttoreDEL MONTEDI COSIMO, SERGIOSERGIODI COSIMODI PERSIO, GIUSEPPEGIUSEPPEDI PERSIOEVANGELISTA, YURIYURIEVANGELISTAFABIANI, SergioSergioFABIANIFERRAZZOLI, RICCARDORICCARDOFERRAZZOLILOFFREDO, PASQUALINOPASQUALINOLOFFREDOMaiolo, LucaLucaMaioloMaita, FrancescoFrancescoMaitaPrimicino, LeandraLeandraPrimicinoRANKIN, JOHNJOHNRANKINRUBINI, ALDAALDARUBINISANTOLI, FRANCESCOFRANCESCOSANTOLISOFFITTA, PAOLOPAOLOSOFFITTATOBIA, ANTONINOANTONINOTOBIATORTOSA, ALESSIAALESSIATORTOSATROIS, ALESSIOALESSIOTROIS2020-11-132020-11-132018978151061951797815106195240277-786Xhttp://hdl.handle.net/20.500.12386/28327IXPE scientific payload comprises of three telescopes, each composed of a mirror and a photoelectric polarimeter based on the Gas Pixel Detector design. The three focal plane detectors, together with the unit which interfaces them to the spacecraft, are named IXPE Instrument and they will be built and calibrated in Italy; in this proceeding, we will present how IXPE Instrument will be calibrated, both on-ground and in-flight. The Instrument Calibration Equipment is being finalized at INAF-IAPS in Rome (Italy) to produce both polarized and unpolarized radiation, with a precise knowledge of direction, position, energy and polarization state of the incident beam. In flight, a set of four calibration sources based on radioactive material and mounted on a filter and calibration wheel will allow for the periodic calibration of all of the three IXPE focal plane detectors independently. A highly polarized source and an unpolarized one will be used to monitor the response to polarization; the remaining two will be used to calibrate the gain through the entire lifetime of the mission.ELETTRONICOenConference paper10.1117/12.23122032-s2.0-85051868793000452819200127https://www.spiedigitallibrary.org/conference-proceedings-of-spie/10699/2312203/Calibration-of-the-IXPE-instrument/10.1117/12.2312203.full?SSO=12018SPIE10699E..5CMFIS/05 - ASTRONOMIA E ASTROFISICAERC sectors::Physical Sciences and Engineering::PE9 Universe sciences: astro-physics/chemistry/biology; solar systems; stellar, galactic and extragalactic astronomy, planetary systems, cosmology, space science, instrumentation::PE9_17 Instrumentation – telescopes, detectors and techniques