Angular distribution of high energy alpha particle flux on the first wall of a tokamak

The angular distribution of a ripple induced flux of high energy alpha particles on the first wall of a circular tokamak reactor is considered. The authors show that the distribution is highly non-uniform in the poloidal angle and that its peaking factor reaches values of 10 to 15 for typical tokamak reactor parameters. The distribution does not depend on the energy of the escaping particles and is therefore practically equivalent to the distribution of the energy load produced by these particles on the surface of the chamber. Furthermore, it is only weakly dependent on the system parameters over the relevant range of practical interest.