  $CaWO_4$ and $Al_2O_3$ are well-established target materials used by
experiments searching for rare events like the elastic scattering off of a
hypothetical Dark Matter particle. In recent years, experiments have reached
detection thresholds for nuclear recoils at the 10 eV-scale. At this energy
scale, a reliable Monte Carlo simulation of the expected background is crucial.
However, none of the publicly available general-purpose simulation packages are
validated at this energy scale and for these targets. The recently started
ELOISE project aims to provide reliable simulations of electromagnetic particle
interactions for this use case by obtaining experimental reference data,
validating the simulation code against them, and, if needed, calibrating the
code to the reference data.
