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A series of further experiments was undertaken on JET to investigate whether the transport of heat in a tokamak is local and diffusive. Initial comparisons of on- and off-axis ICRH in the absence of pellet injection clearly showed that the change in the electron temperature profile depends on the location of the heating. The ohmic heating, however, still had a significant effect on the power balance in the plasma centre with the off-axis case. In experiments reported in this paper, ICRH power levels in excess of 10 MW were used and the effect on the electron temperature profile of the position of the heating was more significant. Heating experiments following pellet injection were also repeated at higher power levels. Basic conclusions that the transport is local and diffusive were confirmed. The experimental data are described, an analysis of the results is presented and possible model forms for the heat flux are discussed.

Additional information

Authors: BALET B, JET Joint Undertaking, Abingdon, Oxon. (GB);CORDEY J G, JET Joint Undertaking, Abingdon, Oxon. (GB)
Bibliographic Reference: Report: JET-P(93)86 EN (1993) 16 pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon. OX14 3EA (GB)
Record Number: 199311559 / Last updated on: 1994-11-28
Original language: en
Available languages: en