Monte Carlo simulation of neoclassical transport in axisymmetric and ripple tokamaks

Simple axisymmetric and ripple tokamak model fields are used to compute neoclassical transport coefficients by Monte Carlo simulation over a wide range of mean free paths in the approximation of small gyroradius. Further assumptions are a monoenergetic particle distribution which is only subject to pitch angle scattering and a vanishing electric field. Pfirsch-Schlueter, plateau, banana and ripple transport coefficients are obtained. In the ripple regime the description is unified by introducing the concept of an effective ripple. Cases in which ripple transport is diminished due to collisionless detrapping are observed. (orig.)