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(EXP2/03) Dimensionally Similar Studies of Confinement and H-mode Transition in ASDEX Upgrade and JET

(This paper was rapporteured in lecture EX7/2)

F. Ryter, J. Stober, W. Suttrop, J. C. Fuchs, O. Gruber, H. Meister, H. Murmann, S. de Peña Hempel, H. Salzmann, J. Schweinzer and the ASDEX Upgrade Team

Max-Planck-Institut für Plasmaphysik, EURATOM-IPP Association, Garching and Berlin, Germany

J. P. Christiansen, G. Huysmans, P. Lomas, C. Lowry, B. Schunke, B. Tubbing and JET Team

JET Joint undertaking, Abingdon, OX 14 3EA England

Abstract.  Joint experiments on confinement and L-H transition were performed in ASDEX Upgrade and JET. The confinement experiments suggest that the invariance principle is not always fulfilled at high density. For the L-H transition studies, the dimensionless variables taken at the plasma edge can be in general only made identical per pair, due to the condition imposed by the L-H transition. This new approach to investigate the L-H physics suggests a weak dependence of the L-H transition mechanism on collisionality.

Read the full paper in PDF format.