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The energy confinement properties of different regimes of JET plasmas are investigated. The results of local transport analysis in both L- and H-mode regimes are discussed and the properties of H-mode plasmas produced by neutral beam injection and/or ion cyclotron resonance heating are compared. Two aspects of transport analysis are addressed. The relative importance of the electron and ion heat conductivities is discussed and these are compared with the effective particle diffusivity. The adequacy of present theoretical models in describing the radial dependence of the measured heat flux is questioned. The theoretical models considered are the ion temperature gradient driven turbulence model, the Rebut-Lallia critical temperature gradient model, the dissipative and collisionless trapped electron drift wave model, the Carreras-Diamond resistive ballooning model and the neoclassical pressure gradient driven turbulence model. None of these gives a completely good fit to the radial behaviour of the measured heat flux in all of the pulses.

Additional information

Authors: BALET B, JET Joint Undertaking, Abingdon, Oxon. (GB);CORDEY J G, ;STUBBERFIELD P M,
Bibliographic Reference: Report: JET-P(90)51 EN (1990) 47 pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon. OX14 3EA (GB)
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