  The European Spallation Source (ESS) is the world's next generation
spallation-based neutron source. The research conducted at ESS will yield in
the discovery and development of new materials including the fields of
manufacturing, pharmaceuticals, aerospace, engines, plastics, energy,
telecommunications, transportation, information technology and biotechnology.
The spallation source will deliver an unprecedented neutron flux. In
particular, the reflectometers selected for construction, ESTIA and FREIA, have
to fulfill challenging requirements. Local incident peak rate can reach
10$^5$~Hz/mm$^2$. For new science to be addressed, the spatial resolution is
aimed to be less than 1 mm with a desired scattering of 10$^{-4}$ (peak-to-tail
ratio). The latter requirement is approximately two orders of magnitude better
than the current state-of-the-art detectors. The main aim of this work is to
quantify the cumulative contribution of various detector components to the
scattering of neutrons and to prove that the respective effect is within the
requirements set for the Multi-Blade detector by the ESS reflectometers. To
this end, different sets of geometry and beam parameters are investigated, with
primary focus on the cathode coating and the detector window thickness.
