Electron Cyclotron Current Drive in Tokamak Plasma with Different Equilibrium Configuration

Abstract

Abstract: With given total toroidal current and central current density of plasma, temperature, density and magnetic field profiles of tokamak plasma with different elongation and triangularity are obtained numerically with Grad-Shafranov equation. Electron cyclotron wave ray trajectories and current drive in configurations are investigated with Fokker-Planck equation incorporated into a ray tracing code. It shows that as electron cyclotron wave of X-mode are launched from top, rays propagate toward low-field side with increasing elongation. As electron cyclotron wave are launched from mid-plane and low-field-side, high quotient power deposition is obtained with greater elongation, and driven current profile is close to central plasma with increase of triangularity. Current drive profile moves toward central plasma and peak current density increases with decreasing poloidal or toroidal injection angle.

Key words: electron cyclotron wave, ray trajectories, current drive

CLC Number:

ZHONG Yijun, GONG Xueyu, LI Xinxia, LI Jingchun. Electron Cyclotron Current Drive in Tokamak Plasma with Different Equilibrium Configuration[J]. CHINESE JOURNAL OF COMPUTATIONAL PHYSICS, 2016, 33(4): 447-452.

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