JET-P(94)14

The Time Behaviour of the Thermal Conductivity during L→H and H→L Transitions in JET

J.G. Cordey, D.G. Muir, S.V. Neudatchin, V.V. Parail, S. Ali-Arshad, D.V. Bartlett, D.J. Campbell, A.E. Costley, A.L. Colton, A.W. Edwards, L. Porte, A.C.C. Sips, E.M. Springmann, P.M. Stubberfield, G. Vayakis, M.G. von Hellermann, A. Taroni, K. Thomsen

The change in thermal transport across the L→H transition is studied in detail for those JET high performance H-modes which have a very fast transition. It is found that in these pulses the transport changes very rapidly (< 4 msecs) over a very large radial region 0.5 < ρ < 1, and a very large transport barrier is formed. The reasons for the formation of this barrier are discussed.

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JETP93108	1.17 Mb