Deposition patterns of fast ions on plasma facing components in W7-X

The losses of fast ions (65 keV deuterons, 3 MeV protons and 1 MeV tritons) and their deposition patterns on the plasma facing components (PFCs) are studied for a high-nTt scenario of the Helias type stellarator W7-X. For these computations a system of numerical codes is used which allows self-consistent computation of finite-b equilibria and the corresponding magnetic fields, tracing of guiding centres of fast particles taking into account slowing down and pitch angle scattering and determination of the deposition patterns of the lost fast ions on the PFCs. For this purpose the geometry of the first wall and the target plates has been implemented. These results will serve as a basis for heat load protection in the case of deuterons and for plasma diagnostics in the case of protons and tritons.