Speaker
Description
Electron backscattering at the gold-plated rear wall disk is an important systematic effect in the KATRIN experiment, as it modifies the observed electron energy spectrum and can therefore bias the determination of the neutrino mass. A precise description of this process is essential for the KATRIN neutrino-mass analysis
This poster presents an overview of the theoretical modeling of rear-wall electron backscattering in KATRIN. The contributions from both inelastic and elastic scattering are considered. Inelastic scattering is modeled using publicly available optical data, while elastic scattering is described using appropriate theoretical scattering models. The physical effects included in Monte Carlo programs are discussed, and the resulting simulations are compared with measured Reflection Electron Energy Loss Spectra (REELS) to test their ability to reproduce the observed electron energy-loss and backscattering behaviour.