Modeling of the internal circulation constraint formation in the FT-2 tokamak

Abstract

A change in the heat transfer conditions and a mechanism of the internal circulation constraint formation were modeled using a self-consistent BATRAC code. It is demonstrated that conditions favoring a sharp drop in the heat transfer may arise in experiments on the FT-2 tokamak as a result of the ion temperature rise from 100 to 300 eV at the center of the plasma column caused by the effective lower hybrid heating power absorption by the ions. A key point in this phenomenon is related to a growth in the radial electric field strength and the poloidal rotation velocity shear.