The relationship between q profiles, transport, and sawteeth in tokamaks

The relationship between q profiles, transport, and sawteeth in tokamaks

The relationship between q profiles, transport, and sawteeth in tokamaks 150 150 Mathew

The relationship between q profiles, transport, and sawteeth in tokamaks

The purpose of this paper is to investigate the possible relationships between transport properties such as thermal diffusivity and resistivity on the one hand, and the magnetic properties such as q profile and toroidal flux change on the other, in tokamaks that exist under macroscopically quasistationary conditions. It is experimentally well established that when the sources are held constant over times long compared with energy and particle confinement times, tokamak discharges can exist in a quasistationary state with or without periodic sawteeth superposed on the basic equilibrium. The principal aim of this study is to provide qualitative physical insight into the nature of such states. For simplicity, single-fluid equations are assumed and the analysis is restricted to a cylinder model. The complete set of conservation equations comprising continuity, pressure balance, Ohm’s law, and energy ‘balance are used along with appropriate sources. The conductive energy loss is assumed to occur due to an anomalous thermal diffusivity.

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17/07/1991