Neoclassical Theory for Rotation and Impurity Transport in Tokamaks with NeuralBeam Injection

摘要

While transport in tokamaks is generally thought to be dominated by anomalouseffects, there is a growing body of evidence that under certain conditions neoclassical theory can account for many aspects of ion transport. For example, in enhanced reverse shear (ERS) plasmas in the Tokamak Fusion Test Reactor (TFTR) and negative central shear plasma in Doublet III-D (DIII-D) turbulence is suppressed and the standard neoclassical expressions predict the measured ion thermal conductivity rather well. Calculations of momentum confinement time based on neoclassical gyroviscous theory have agreed rather well with measurements in several tokamaks. In H-mode (High Confinement mode) plasmas to the Joint European Torus (JET), the measured value of radial impurity flow has been shown to be in agreement with neoclassical theory, and neoclassical temperature gradient screening may explain the expulsion of carbon from the core in JET hot ion mode discharges.