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A new analysis technique has been developed for the study of the decay rate of sawteeth-perturbed T(e) profiles to investigate electron transport in the spatial zone between the inversion and mixing radii. The data presented are from JET L and H mode plasmas with currents ranging from 1.5 MA to 6 MA and with additional heating ranging from 2 to 22 MW. Low values of the dynamic electron heat diffusivity (chi e)(HP) were obtained for very good confinement H modes (VH modes) with high values of T(e) and del.T(e). No simple dependence of electron conductivity on T(e) or del.T(e) can produce the (chi e)(HP) values obtained in all regimes L, H and VH. However, it was found in general that the variations of (chi e)(HP) due to parameter changes were consistent with those observed for the heat diffusivity obtained from power balance calculations.

Additional information

Authors: NEUDATCHIN S V, JET Joint Undertaking, Abingdon, Oxon. (GB);MUIR D G, JET Joint Undertaking, Abingdon, Oxon. (GB)
Bibliographic Reference: Report: JET-P(93)27 EN (1993) 36 pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon. OX14 3EA (GB)
Record Number: 199310913 / Last updated on: 1994-11-29
Original language: en
Available languages: en
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