Application of hybrid iterative approach for full wave modeling of hot tokamak plasma*

Hybrid iterative approach for solving linear wave equations with nonlocal hot plasma dielectric response in frequency domain in configuration space is being developed. It combines time evolution of the electromagnetic fields and iterative relaxation schemes into iteration cycles. Provided sufficient dissipation of RF power in simulation domain, the iteration cycles converge to solution of full wave boundary value problem. The approach is tested for modeling RF beam propagation and absorption in tokamaks in ECR frequency range. The nonlocal hot plasma dielectric response is formulated by calculating the plasma conductivity kernel based on the solution of the linearized Vlasov equation in inhomogeneous magnetic field. In this scenario the hot plasma dielectric response is mostly limited to the distance of a few particles' Larmor radii, near the magnetic field line passing through the test point, which significantly reduces the size of the problem. The details of the hybrid iterative algorithm will be presented along with the initial results of simulations of RF waves in a realistic hot tokamak plasma.