Monte Carlo simulation for ICRF heating in Heliotron/Torsatrons

A Monte Carlo simulation code has been developed for studying ICRF minority heating in heliotron/torsatrons that includes complicated orbits of high energy particles, Coulomb collisions, interactions between the particles and the applied RF field, and the self-determined radial electric field in the finite β equilibrium. Calculations have been carried out using the code to study the physics of ICRF minority heating in heliotron/torsatrons, taking the Large Helical Device as an example. The radial electric field is self-consistently determined, taking into account the orbit loss of accelerated minority ions. Common characteristics of the physics of ICRF minority heating in heliotron/torsatrons, such as the effects of finite β, location of the resonance layer, finite Kparallel, minority species and the radial electric field, are clarified. (author). 10 refs, 4 figs