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Controlling turbulence in present and future stellarators.

P Xanthopoulos1, H E Mynick2, P Helander1

  • 1Max-Planck-Institut für Plasmaphysik, Wendelsteinstraße 1, 17491 Greifswald, Germany.

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|November 7, 2014
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Summary
This summary is machine-generated.

Turbulence simulations reveal key differences in stellarator performance compared to tokamaks. Researchers optimized a stellarator design to mitigate turbulence and improve plasma confinement for fusion energy.

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Area of Science:

  • Plasma physics
  • Fusion energy research
  • Computational physics

Background:

  • Turbulence is a significant challenge for plasma confinement in stellarators, potentially limiting fusion energy performance.
  • Neoclassically optimized stellarators aim to improve confinement but require understanding turbulence effects.
  • Comparing stellarator and tokamak turbulence is crucial for advancing fusion reactor designs.

Purpose of the Study:

  • To predict turbulence fluctuation distribution and transport scaling on stellarator magnetic surfaces.
  • To identify differences in turbulence behavior between stellarators and tokamaks.
  • To develop the first turbulence-optimized stellarator configuration.

Main Methods:

  • Utilizing petaflop-scale gyrokinetic simulations for high-fidelity turbulence analysis.
  • Applying a stochastic global-search optimization method for design optimization.
  • Analyzing turbulence across entire stellarator magnetic surfaces.

Main Results:

  • Gyrokinetic simulations revealed distinct turbulence fluctuation patterns and transport scaling in stellarators compared to tokamaks.
  • Striking differences in turbulence behavior were observed between the two magnetic confinement concepts.
  • The study successfully derived a novel, turbulence-optimized stellarator configuration.

Conclusions:

  • Turbulence significantly impacts stellarator performance, with unique characteristics compared to tokamaks.
  • Optimizing stellarator designs against turbulence is feasible and essential for achieving efficient plasma confinement.
  • The developed quasi-omnigenous, turbulence-optimized stellarator represents a significant advancement in fusion energy research.