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One of the science goals of the Wide Field Imager (WFI) on ESA's Athena X-rayobservatory is to map hot gas structures in the universe, such as clusters andgroups of galaxies and the intergalactic medium. These deep observations offaint diffuse sources require low background and the best possible knowledge ofthat background. The WFI Background Working Group is approaching this problemfrom a variety of directions. Here we present analysis of Geant4 simulations ofcosmic ray particles interacting with the structures aboard Athena, producingsignal in the WFI. We search for phenomenological correlations between theseparticle tracks and detected events that would otherwise be categorized asX-rays, and explore ways to exploit these correlations to flag or reject suchevents in ground processing. In addition to reducing the Athena WFIinstrumental background, these results are applicable to understanding theparticle component in any silicon-based X-ray detector in space.

Reducing the Athena WFI charged particle background: Results from Geant4 simulations