Simulation Project tripleaxis: Filter

To avoid contamination by second order neutrons, one often uses a powder filter, as described in Problem: The Be filter. For 5.0 meV, the choice is Be. A 10 cm thick powder sample of this light metal is placed either between the monochromator and the "physical" sample, or right after the sample. Such a Be filter will scatter away neutrons with energies above a certain cut-off energy. A filter is typically cooled to avoid inelastic scattering due to phonons.

The filter shall not be simulated in this project.