dorsal/arxiv
View SchemaTransport control by coherent zonal flows in the core/edge transitional regime
| Authors | K. Hallatschek, D. Biskamp |
|---|---|
| Categories | |
| ArXiv ID | physics/0009058 |
| URL | https://arxiv.org/abs/physics/0009058 |
| DOI | 10.1103/PhysRevLett.86.1223 |
Abstract
3D Braginskii turbulence simulations show that the energy flux in the core/edge transition region of a tokamak is strongly modulated - locally and on average - by radially propagating, nearly coherent sinusoidal or solitary zonal flows. The flows are geodesic acoustic modes (GAM), which are primarily driven by the Stringer-Winsor term. The flow amplitude together with the average anomalous transport sensitively depend on the GAM frequency and on the magnetic curvature acting on the flows, which could be influenced in a real tokamak, e.g., by shaping the plasma cross section. The local modulation of the turbulence by the flows and the excitation of the flows are due to wave-kinetic effects, which have been studied for the first time in a turbulence simulation.
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"abstract": "3D Braginskii turbulence simulations show that the energy flux in the\ncore/edge transition region of a tokamak is strongly modulated - locally and on\naverage - by radially propagating, nearly coherent sinusoidal or solitary zonal\nflows. The flows are geodesic acoustic modes (GAM), which are primarily driven\nby the Stringer-Winsor term. The flow amplitude together with the average\nanomalous transport sensitively depend on the GAM frequency and on the magnetic\ncurvature acting on the flows, which could be influenced in a real tokamak,\ne.g., by shaping the plasma cross section. The local modulation of the\nturbulence by the flows and the excitation of the flows are due to wave-kinetic\neffects, which have been studied for the first time in a turbulence simulation.",
"arxiv_id": "physics/0009058",
"authors": [
"K. Hallatschek",
"D. Biskamp"
],
"categories": [
"physics.plasm-ph"
],
"doi": "10.1103/PhysRevLett.86.1223",
"title": "Transport control by coherent zonal flows in the core/edge transitional regime",
"url": "https://arxiv.org/abs/physics/0009058"
},
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