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P: Fachverband Plasmaphysik
P 9: Helmholtz Graduate School 2 and Magnetic confinement 2
P 9.3: Vortrag
Dienstag, 10. März 2020, 14:55–15:20, b305
Scrape-off layer (SOL) power width scaling and correlation between SOL and pedestal gradients across L, I and H-mode plasmas at ASDEX Upgrade — •Davide Silvagni1,2, Thomas Eich1, Michael Faitsch1, Tim Happel1, Bernhard Sieglin1, Pierre David1, Luis Gil3, Ulrich Stroth1,2, and the ASDEX Upgrade team1 — 1Max-Planck-Institut für Plasmaphysik, Boltzmannstr. 2, 85748 Garching, Germany — 2Physik-Department E28, Technische Universität München, James-Franck-Str. 1, 85748 Garching, Germany — 3Instituto de Plasmas e Fusão Nuclear, Instituto Superior Técnico, Universidade Lisboa, PT
A cross-regime (L-mode, I-mode, inter-type-I-ELM H-mode and stationary ELM-free H-mode) database combining scrape-off layer (SOL) power decay length λq divertor measurements and upstream SOL electron pressure, temperature and density decay lengths has been assembled at ASDEX Upgrade. It is found that a cross-regime λq scaling is best described by a local edge quantity, such as the edge electron pressure evaluated at ρpol=0.95. Furthermore, λq exhibits a clear correlation with edge electron pressure gradient lengths, no matter if taken inside or outside the separatrix. In addition, the database reveals that SOL and pedestal electron pressure gradients are remarkably well correlated across all confinement regimes. Moreover, it is shown that the Spitzer-Härm electron conduction regime is a reasonable approximation to estimate λq across different confinement regimes. The main implication of these findings is that in these regimes a widening of λq is linked to a reduction of edge electron pressure gradients.