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The transfer function is a fundamental concept representing the ratio of two polynomials. The numerator and denominator encapsulate the system's dynamics. The zeros and poles of this transfer function are critical in determining the system's behavior and stability.
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Direct microstability optimization of stellarator devices.

R Jorge1,2, W Dorland3,4,5, P Kim3

  • 1Instituto de Plasmas e Fusão Nuclear, <a href="https://ror.org/03db2by73">Instituto Superior Técnico</a>, Universidade de Lisboa, 1049-001 Lisboa, Portugal.

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Summary
This summary is machine-generated.

Optimizing stellarators with gyrokinetic simulations efficiently reduces turbulent heat flux. This approach balances plasma transport and magnetic field symmetry for better fusion energy confinement.

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Area of Science:

  • Nuclear Fusion Energy
  • Plasma Physics
  • Computational Physics

Background:

  • Turbulent transport is a major obstacle in achieving controlled nuclear fusion.
  • Both tokamaks and stellarators face challenges with heat and particle transport.
  • Minimizing turbulent transport is crucial for efficient magnetic confinement fusion.

Purpose of the Study:

  • To efficiently reduce turbulent heat flux in magnetic confinement fusion devices.
  • To develop an optimization strategy coupling stellarator geometry with plasma transport.
  • To investigate the interplay between magnetic configuration and microstability-driven transport.

Main Methods:

  • Coupling stellarator optimization algorithms with linear gyrokinetic simulations.
  • Calculating the quasilinear heat flux as a proxy for turbulent transport.
  • Minimizing the sum of quasilinear heat flux and deviation from quasisymmetry.
  • Iteratively refining the stellarator magnetic configuration.

Main Results:

  • Achieved a significant decrease in the quasilinear heat flux, a microstability-based transport proxy.
  • Demonstrated an efficient method for reducing turbulent transport through geometric optimization.
  • Established a balance between neoclassical and turbulent transport by minimizing their combined proxies.
  • Showcased the effectiveness of integrating linear gyrokinetic simulations into the optimization loop.

Conclusions:

  • Stellarator optimization coupled with gyrokinetic simulations offers an efficient pathway to mitigate turbulent transport.
  • Balancing geometric properties (quasisymmetry) and microstability-based transport is key to improved fusion reactor performance.
  • This integrated approach provides a powerful tool for designing next-generation magnetic confinement fusion devices.