IXPE 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.
@article{arxiv.2111.14511,
title = {Calibration of the IXPE instrument},
author = {Fabio Muleri and Carlo Lefevre and Raffaele Piazzolla and Alfredo Morbidini and Fabrizio Amici and Primo Attinà and Mauro Centrone and Ettore Del Monte and Sergio Di Cosimo and Giuseppe Di Persio and Yuri Evangelista and Sergio Fabiani and Riccardo Ferrazzoli and Pasqualino Loffredo and Luca Maiolo and Francesco Maita and Leandra Primicino and John Rankin and Alda Rubini and Francesco Santoli and Paolo Soffitta and Antonino Tobia and Alessia Tortosa and Alessio Trois},
journal= {arXiv preprint arXiv:2111.14511},
year = {2021}
}