Controlling turbulence in present and future stellarators.
Turbulence is widely expected to limit the confinement and, thus, the overall performance of modern neoclassically optimized stellarators. We employ novel petaflop-scale gyrokinetic simulations to predict the distribution of turbulence fluctuations and the related transport scaling on entire stellarator magnetic surfaces and reveal striking differences to tokamaks. Using a stochastic global-search optimization method, we derive the first turbulence-optimized stellarator configuration stemming from an existing quasiomnigenous design.
Max-Planck-Institut für Plasmaphysik, Wendelsteinstraße 1, 17491 Greifswald, Germany.
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P
Xanthopoulos
Plasma Physics Laboratory, Princeton University, Princeton, New Jersey 08543, USA.
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HE
Mynick
Max-Planck-Institut für Plasmaphysik, Wendelsteinstraße 1, 17491 Greifswald, Germany.
P
P
Helander
Max-Planck-Institut für Plasmaphysik, Wendelsteinstraße 1, 17491 Greifswald, Germany.
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Y
Turkin
Max-Planck-Institut für Plasmaphysik, Wendelsteinstraße 1, 17491 Greifswald, Germany.
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Plunk
Max-Planck-Institut für Plasmaphysik, Boltzmannstraße 2, 85748 Garching, Germany.
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F
Jenko
Max-Planck-Institut für Plasmaphysik, Boltzmannstraße 2, 85748 Garching, Germany.
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T
Görler
Max-Planck-Institut für Plasmaphysik, Boltzmannstraße 2, 85748 Garching, Germany.
D
D
Told
Max-Planck-Institut für Plasmaphysik, Wendelsteinstraße 1, 17491 Greifswald, Germany.
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T
Bird
Max-Planck-Institut für Plasmaphysik, Wendelsteinstraße 1, 17491 Greifswald, Germany.
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Proll