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Abstract

This paper is a review of the work done on ASDEX on the H-mode since its discovery in 1982. In detail, it presents : (1) the development of the plasma profiles - steep edge gradients and flat bulk profiles; (2) the MHD properties resulting from the profile changes, including an extensive stability analysis; (3) the impurity development with special emphasis on the MHD aspects and on neoclassical impurity transport effects in quiescent H-phases; (4) a detailed study of the edge properties including the evidence of 3-dimensional distortions at the edge. The part on confinement encompasses scaling studies and the results of transport analysis. The power threshold of the H-mode is found to depend slightly on the density but hardly on the toroidal field or current. The operational range includes results on the limiter H-mode of ASDEX and on the development of the H-mode under beam current drive conditions. Several experiments are described which demonstrate the crucial role of the edge electron temperature in the H-mode transition. New material on magnetic and density fluctuation studies at the plasma edge within the edge transport barrier is presented. Finally, the findings on ASDEX are compared with those on other machines and are used to test various H-mode theories.

Additional information

Authors: THE ASDEX TEAM, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE)
Bibliographic Reference: Report: IPP III/151 EN (1989)
Availability: Available from Max-Planck-Institut für Plasmaphysik, 8046 Garching-bei-München (DE)
Record Number: 199010327 / Last updated on: 1994-12-01
Category: PUBLICATION
Original language: en
Available languages: en