Kiel 2004 – wissenschaftliches Programm
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P: Plasmaphysik
P IV: HV IV
P IV.1: Hauptvortrag
Dienstag, 9. März 2004, 11:00–11:30, H\"orsaal D
ASDEX Upgrade and JET - a European Step Ladder to ITER — •Jörg Stober1, ASDEX Upgrade Team1, and EFDA-JET collaborators2 — 1Max-Planck Institut für Plasmaphysik, Garching — 2JET, Culham-Science-Centre, Abingdon, UK
The physics relevant for the international experimental fusion reactor ITER is assessed comparing existing devices of different size to extrapolate to the larger size of ITER and to test the size scalings deduced from theory. The uncertainties of the extrapolation are significantly reduced, if the magnetic configuration is very close to ITER as it is the case for the two tokamaks ASDEX Upgrade (AUG) and JET. The ratio of the linear dimensions in AUG:JET:ITER is roughly 1:2:4. Comparative studies on various fields have been done to find the correct dependence of the observed phenomena on the relevant dimensionless parameters which determine the physics. Some of these studies are detailed in the talk: the onset conditions for specific magnetic islands (NTMs) which short-circuit the magnetic confinement is an example for the determination of the important term in the theoretical description. The shape dependence of confinement is a rather empirical observation on both machines which triggered combined effort on the documentation of the plasma edge. Starting from a wind-tunnel approach the hybrid-scenario of AUG, which combines the advantages of a good H-mode with an optimized magnetic shear profile has recently been found at JET. So far less successfull is the search for the type-II ELMy H-mode in JET which allows to steady the power flux on the divertor in AUG, as it is necessary for ITER. The physics behind this difference is still under investigation.