Anisotropy and tail formation in ICRF-heated tokamak plasmas

A local, two-dimensional (in velocity space), time-dependent, quasi-linear Ion Cyclotron Range of Frequencies (ICRF) Fokker-Planck model is used to study heating in PLT and NUWMAK reactor plasmas. It is found that PLT ICRF experimental results, including tail formation, are well modelled when charge-exchange, radial and radiation losses and Ohmic heating are incorporated. For the NUWMAK reactor parameters, the lower-radiofrequency power per resonant particle and high density provide an isotropic Maxwellian plasma describable by fluid models.