  The first fast ion experiments in Wendelstein 7-X were performed in 2018.
They are one of the first steps in demonstrating the optimised fast ion
confinement of the stellarator. The fast ions were produced with a neutral beam
injection (NBI) system and detected with infrared cameras (IR), a fast ion loss
detector (FILD), fast ion charge exchange spectroscopy (FIDA), and post-mortem
analysis of plasma facing components. The fast ion distribution function in the
plasma and at the wall is being modelled with the ASCOT suite of codes. They
calculate the ionisation of the injected neutrals and the consecutive slowing
down process of the fast ions. The primary output of the code is the
multidimensional fast ion distribution function within the plasma and the
distribution of particle hit locations and velocities on the wall. Synthetic
measurements based on ASCOT output are compared to experimental results to
assess the validity of the modelling. This contribution presents an overview of
the various fast ion measurements in 2018 and the current modelling status. The
validation and data-analysis is on-going, but the wall load IR modelling
already yield results that match with the experiments.
