Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Turbulence in the near scrape-off layer towards the L-mode density limit in ASDEX-Upgrade
The L-mode density limit in ASDEX Upgrade is investigated with focus on the scrape-off layer. We observe a chain of events that involves the collapse of the E×B outer shear layer (just outside the separatrix), widening of the electron pressure fall-off length, outer divertor detachment, density shoulder formation, reduction and flattening of the parallel Mach number, and enhanced turbulent cross-field transport. The latter effect was associated with higher amplitude density fluctuations at low frequencies, where the turbulent cross-phase between density and velocity fluctuations pointing radially outward was favourable.
Turbulence in the near scrape-off layer towards the L-mode density limit in ASDEX-Upgrade
The L-mode density limit in ASDEX Upgrade is investigated with focus on the scrape-off layer. We observe a chain of events that involves the collapse of the E×B outer shear layer (just outside the separatrix), widening of the electron pressure fall-off length, outer divertor detachment, density shoulder formation, reduction and flattening of the parallel Mach number, and enhanced turbulent cross-field transport. The latter effect was associated with higher amplitude density fluctuations at low frequencies, where the turbulent cross-phase between density and velocity fluctuations pointing radially outward was favourable.
Turbulence in the near scrape-off layer towards the L-mode density limit in ASDEX-Upgrade
G. Grenfell (Autor:in) / P. Manz (Autor:in) / G.D. Conway (Autor:in) / T. Eich (Autor:in) / J. Adamek (Autor:in) / D. Brida (Autor:in) / M. Komm (Autor:in) / T. Nishizawa (Autor:in) / M. Griener (Autor:in) / B. Tal (Autor:in)
2022
Aufsatz (Zeitschrift)
Elektronische Ressource
Unbekannt
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Turbulence in the near scrape-off layer towards the L-mode density limit in ASDEX-Upgrade
| Elsevier | 2022