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Abstract

To compare different ohmic confinement regimes in ASDEX, the edge conditions are analysed in detail. The results show that the improved ohmic confinement comes along with a drop of the separatrix density. This drop allows the density profile to peak and seems to be the trigger of a change in the transport. Simultaneously, a universal scaling between the electron temperature and the electron density at the separatrix prevails for all ohmic scenarios. In addition, the total particle flux across the separatrix is evaluated and found to be strongly correlated to the separatrix density. Thus, the associated convective energy loss contributes less to the total energy losses when the confinement is improved. Since the correlations between edge parameters do not change in different ohmic confinement regimes of ASDEX, the edge physics remains about the same. Improved ohmic confinement is then characterised by an optimum separatrix density which provides a sufficient high edge temperature together with low particle fluxes. These optimum conditions then yield the maximum particle confinement.

Additional information

Authors: BESSENRODT-WEBERPALS M, Max-Planck-Institut für Plasmaphysik, D-8046 Garching bei München (DE);CARLSON A, Max-Planck-Institut für Plasmaphysik, D-8046 Garching bei München (DE);HAAS G, Max-Planck-Institut für Plasmaphysik, D-8046 Garching bei München (DE);MURMANN H, Max-Planck-Institut für Plasmaphysik, D-8046 Garching bei München (DE);NEUHAUSER J, Max-Planck-Institut für Plasmaphysik, D-8046 Garching bei München (DE);SÖLDNER F X, Max-Planck-Institut für Plasmaphysik, D-8046 Garching bei München (DE);VERBEEK H, Max-Planck-Institut für Plasmaphysik, D-8046 Garching bei München (DE);ASDEX TEAM, Max-Planck-Institut für Plasmaphysik, D-8046 Garching bei München (DE);TSOIS N, N.R.C.N.S. Democritos, Athens (GR);SOLDNER F X, Max-Planck-Institut fur Plasmaphysik, D-8046 Garching bei Munchen (DE)
Bibliographic Reference: Report: IPP 1/248 EN (1989)
Availability: Available from Max-Planck-Institut für Plasmaphysik, 8046 Garching bei München (DE)
Record Number: 198911057 / Last updated on: 1994-12-01
Category: PUBLICATION
Original language: en
Available languages: en