High-Speed Analysis of Heating and Current Drive with Neutral Beam Injection in Tokamak Plasma

Abstract

We developed a Fokker-Planck solver to analyze heating and current drive with neutral beam injection in tokamak plasma and introduced it into the integral transport code TOTAL. In the developed solver, the fast ion distribution function is expanded in the eigenfunctions of the collisional pitch angle scattering operator. The time evolution of the distribution function is obtained by solving 1-D partial differential equations for velocity, so that high-speed analysis is possible. In the analyses using the point source and assuming zero toroidal drift, the results of the heating power and the driven current evaluated in steady state agreed well with the results calculated by the OFMC code and the ACCOME code. We demonstrated that the TOTAL code implemented with the solver is able to simulate a DEMO operation scenario with neutral-beam injection.