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Abstract

The main experimental results on confinement and transport processes in tokamaks are summarized. It is difficult to draw definite conclusions from measurements of the global energy containment time even in the quasi steady phase of those ohmically heated discharges, which do not exhibit gross instability or appreciable effects due to runaway electrons. However, comparison of particle and energy confinement suggests that the loss process is mainly conduction rather than convection. In order to separate the various energy input and loss mechanisms the assumptions of classical ohmic heating and equipartition are made. The experimental evidence for these assumptions is presented. The dominant energy transport process is electron thermal conduction, for which a formalism is suggested for comparing experimental data with various theoretical models. particle and impurity transport appears to require the neoclassical pinch term in addition to anomalous particle diffusion at a significantly lower rate than electron conduction.

Additional information

Authors: HUGILL J CULHAM LABORATORY, ABINGDON, OXON. (UK), CULHAM LABORATORY, ABINGDON, OXON. (UK)
Bibliographic Reference: NUCLEAR FUSION, VOL. 23 (1983), NO. 3, PP. 331-373
Record Number: 1989122018900 / Last updated on: 1987-01-01
Category: PUBLICATION
Available languages: en