Enhanced simulations on the Athena/Wide Field Imager instrumental background

The Wide Field Imager (WFI) is one of two focal plane instruments the Advanced Telescope for High-Energy Astrophysics (Athena), ESA’s next large x-ray observatory, planned launch in early 2030s. current baseline halo orbit around L2, and second Lagrangian point Sun-Earth system L1 under consideration. For both potential orbits, radiation environment, solar cosmic protons, electrons, He-ions will affect performance instruments. A further critical contribution to instrument background arises from unfocused hard background. It important understand estimate expected instrumental investigate measures, such as design modifications or analysis methods, which could improve level achieve challenging scientific requirement (<5 × 10 − 3 counts / cm2 keV s at 2 7 keV). Previous WFI simulations done Geant4 have been improved by taking into account new information about proton flux L2. In addition, simulation model its surroundings employed has refined follow technological development camera.