Distribution function for plasma with RF heating from quasilinear fokker-planck equation

In the present paper we consider a magnetically confined plasma in the presence of ion cyclotron resonant heating (ICRH) in the minority scheme. The distribution function of the minority species was split into a steady state part corresponding to the time averaged part and the time harmonic perturbation corresponding to the rapid varying part driven by high-frequency field. The both distribution functions are supposed non-Maxwellian and written as Maxwellian multiplied by deformation functions, specific for each part. The goal of the paper is to study the radial profile of these deformation functions and their relation with power density absorbtion in the particular case of isotropic velocity space. The steady state part of the distribution function is obtained from the quasilinear Fokker-Planck equation. On the other hand, the kinetic equation is used to find the rapid varying part of the distribution function driven by radio-frequency field in terms of the steady state part and so the deformation functions from Maxwellian form. The both deformation functions and the diffusion coefficient are plotted for some specific situations using density and temperature profiles inspired by experiment data in JET. The obtained results show how the deformation functions depends both on the power density deposition profile and the value of power density deposition.SCOPUS: ar.j