  The propagation of electron beams carrying angular momentum in crystals is
studied using a multislice approach for the model system Fe. It is found that
the vortex beam is distorted strongly due to elastic scattering. Consequently,
the expectation value of the angular momentum as well as the local vortex
components change with the initial position of the vortex and the propagation
depth, making numerical simulations indispensable when analyzing experiments.
