Advanced modelling of cyclotron wave heating and current drive in toroidal plasmas based on integro-differential full wave analysis

Self-consistent and accurate modelling of wave-plasma interactions is one of the key issues in producing and sustaining burning plasmas. We have upgraded our full wave component of the integrated modelling code TASK, taking account of the finite gyroradius effects indispensable for correctly describing the absorption of ICRF waves by energetic ions and the behavior of electron Bernstein waves. The integro-differential full wave analysis was coupled with the Fokker-Planck analysis and the GNET code to describe the modification of the momentum distribution function and to calculate the power deposition profile including the finite orbit size effects. These advanced modelling provides more accurate evaluation of the efficiency of wave heating and current drive in tokamaks and helical configurations. The newly-updated TASK/WM component is first applied to the analysis of the electron Bernstein waves in a small-size spherical tokamak plasmas and the driven current is evaluated from the Fokker-Planck analysis. Next the power absorption by alpha particles during the ICRF heating in tokamak plasmas is evaluated with the finite gyroradius effect taken into account. Finally the power deposition profile during the ICRF heating in the three-dimensional LHD configuration is calculated by taking account of the finite gyroorbit effect. (author)