Turbulence driven poloidal asymmetric parallel flow and current perturbations are studied for tokamak plasmas of circular geometry. Whereas zonal flows can lead to in-out asymmetry of parallel flows and currents via the Pfirsch-Schlüter mechanism, ballooned transport can result in an up-down asymmetry due to the Stringer spin-up mechanism. Measurements of up-down asymmetric parallel current fluctuations occurring during the I-phase in ASDEX Upgrade are not responses to the equilibrium by the Pfirsch-Schlüter current, but can be interpreted as a response to strongly ballooned plasma transport coupled with the Stringer spin-up mechanism. A good agreement of the experimental measured limit-cycle frequencies during I-phase with the Stringer spin-up relaxation frequency is found.

Manz, P., Birkenmeier, G., Fuchert, G., Cavedon, M., Conway, G., Maraschek, M., et al. (2016). Poloidal asymmetric flow and current relaxation of ballooned transport during I-phase in ASDEX Upgrade. PHYSICS OF PLASMAS, 23(5) [10.1063/1.4948787].

Poloidal asymmetric flow and current relaxation of ballooned transport during I-phase in ASDEX Upgrade

Cavedon M.;
2016

Abstract

Turbulence driven poloidal asymmetric parallel flow and current perturbations are studied for tokamak plasmas of circular geometry. Whereas zonal flows can lead to in-out asymmetry of parallel flows and currents via the Pfirsch-Schlüter mechanism, ballooned transport can result in an up-down asymmetry due to the Stringer spin-up mechanism. Measurements of up-down asymmetric parallel current fluctuations occurring during the I-phase in ASDEX Upgrade are not responses to the equilibrium by the Pfirsch-Schlüter current, but can be interpreted as a response to strongly ballooned plasma transport coupled with the Stringer spin-up mechanism. A good agreement of the experimental measured limit-cycle frequencies during I-phase with the Stringer spin-up relaxation frequency is found.
Articolo in rivista - Articolo scientifico
plasma;
English
Manz, P., Birkenmeier, G., Fuchert, G., Cavedon, M., Conway, G., Maraschek, M., et al. (2016). Poloidal asymmetric flow and current relaxation of ballooned transport during I-phase in ASDEX Upgrade. PHYSICS OF PLASMAS, 23(5) [10.1063/1.4948787].
Manz, P; Birkenmeier, G; Fuchert, G; Cavedon, M; Conway, G; Maraschek, M; Medvedeva, A; Mink, F; Scott, B; Shao, L; Stroth, U
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/354943
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