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Optimizing stellarators for turbulent transport.

H E Mynick1, N Pomphrey, P Xanthopoulos

  • 1Plasma Physics Laboratory, Princeton University, Princeton, New Jersey 08543, USA.

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Summary
This summary is machine-generated.

Researchers optimized stellarator designs to reduce turbulent transport, a major challenge in fusion energy. New methods significantly decreased ion temperature gradient turbulent transport in proof-of-principle configurations.

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Area of Science:

  • Plasma physics
  • Fusion energy research
  • Computational astrophysics

Background:

  • Stellarator designs traditionally focus on minimizing neoclassical transport.
  • Turbulent transport is typically the dominant energy loss mechanism in stellarators.
  • Mitigating turbulent transport in complex 3D stellarator geometries has been computationally challenging.

Purpose of the Study:

  • To demonstrate that stellarators can be designed to mitigate turbulent transport.
  • To introduce novel computational approaches for tackling turbulent transport in stellarators.

Main Methods:

  • Utilizing advanced gyrokinetic codes capable of 3D nonlinear simulations.
  • Employing sophisticated stellarator optimization codes.
  • Developing and testing proof-of-principle stellarator configurations.

Main Results:

  • Achieved a reduction in ion temperature gradient turbulent transport by a factor of 2-2.5 compared to the National Compact Stellarator Experiment baseline.
  • Identified two initial stellarator configurations demonstrating reduced turbulent transport.

Conclusions:

  • It is feasible to design stellarators that mitigate turbulent transport, in addition to neoclassical transport.
  • The integration of advanced simulation and optimization tools enables the design of improved stellarator configurations for fusion energy.