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The change in thermal transport across the L to H transition is studied in detail for JET high performance H-modes which have a very fast transition. It is found that in these pulses the transport changes very rapidly over a large radial region and a large transport barrier is formed. Several possible theoretical mode structures which have a large radial extent or the toroidal coupling of modes on neighbouring rational surfaces are reviewed and compared with the actual fluctuation measurements.

Additional information

Authors: CORDEY J G ET AL., JET Joint Undertaking, Abingdon, Oxon. (GB)
Bibliographic Reference: Report: JET-P(94)14 EN (1994) 10 pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon. OX14 3EA (GB)
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