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It is shown that during L-H and H-L transitions, soft terminations and strong ELM induced cooling, chi(e) changes across most of the JET plasma column on a millisecond time scale (more than a hundred times faster than the energy confinement time tau(E)) and usually simultaneously with the evolution of H(alpha) radiation. The speed of response to these transitions is very much faster than previously observed. The jump in the electron conductivity can be easily obtained from experimental data. No scaling can describe the observed electron temperature evolution during the transition. Possible explanations for the jump in chi(e) are advanced.

Additional information

Authors: NEUDATCHIN S V, JET Joint Undertaking, Abingdon, Oxon. (GB);CORDEY J G, JET Joint Undertaking, Abingdon, Oxon. (GB);MUIR D G, JET Joint Undertaking, Abingdon, Oxon. (GB)
Bibliographic Reference: Report: JET-P(93)58 EN (1993) 11 pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon. OX14 3EA (GB)
Record Number: 199311465 / Last updated on: 1994-11-28
Original language: en
Available languages: en
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