Collisional Effects of Trapped Electrons on the Anomalous Particle and ThermalPinches

摘要

A small collisionality parameter is shown to be sufficient to deactivate theanomalous pinch effects of particles and/or heat caused by drift-type, low frequency electrostatic modes of turbulence in tokamaks. As the parameter is increased from zero, deactivation of anomalous pinches occurs before instabilities are quenched. Therefore, a collisionless assumption remains qualitatively valid for instabilities themselves, although transport coefficients are sensitively dependent on the collisionality parameter.