A bounce-averaged Fokker-Planck code for stellarator transport

A computer code for solving the bounce-averaged Fokker-Planck equation appropriate to stellarator transport has been developed and its first applications have been made. The code is much faster than the bounce-averaged Monte-Carlo codes, which up to now have provided the most efficient numerical means for studying stellarator transport. Moreover, since the connection to analytic kinetic theory is more direct for the Fokker-Planck approach than for the Monte-Carlo approach, a comparison of theory and numerical experiment is now possible at a considerably more detailed level than previously. (author)