Theory-based transport simulations of TFTR L-mode temperature profiles

Abstract

The temperature profiles from a selection of Tokamak Fusion Test Reactor (TFTR) L-mode discharges [17th European Conference on Controlled Fusion and Plasma Heating, Amsterdam, 1990 (EPS, Petit-Lancy, Switzerland, 1990, p. 114)] are simulated with the 1 (1)/(2) -D baldur transport code [Comput. Phys. Commun. 49, 275 (1988)] using a combination of theoretically derived transport models, called the Multi-Mode Model [Comments Plasma Phys. Controlled Fusion 11, 165 (1988)]. The present version of the Multi-Mode Model consists of effective thermal diffusivities resulting from trapped electron modes and ion temperature gradient (ηi) modes, which dominate in the core of the plasma, together with resistive ballooning modes, which dominate in the periphery. Within the context of this transport model and the TFTR simulations reported here, the scaling of confinement with heating power comes from the temperature dependence of the ηi and trapped electron modes, while the scaling with current comes mostly from resistive ballooning modes.