Tokamak confinement in relation to plateau scaling

Abstract

It is shown that a plateau-like scaling gives a good overall fit to energy confinement data of Ohmic and L-regime discharges for devices ranging from Pulsator to JET. Systematic deviations become evident in density scans in single experiments which, at least for neutral injection heated discharges, might be explained by a compensation of confinement trends by penetration effects.