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Related Experiment Videos

High-beta equilibria of drift-optimized compact stellarators.

A S Ware1, S P Hirshman, D A Spong

  • 1University of Montana-Missoula, Missoula, Montana 59812, USA.

Physical Review Letters
|September 13, 2002
PubMed
Summary

New hybrid stellarator-tokamak designs achieve stable, high-beta plasma confinement. These configurations offer improved stability and reduced bootstrap current, crucial for fusion energy development.

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Area of Science:

  • Plasma Physics
  • Fusion Energy Research
  • Magnetohydrodynamics

Background:

  • Achieving stable plasma confinement at high plasma pressures (beta) is essential for magnetic fusion energy.
  • Traditional stellarators and tokamaks face challenges with stability and confinement properties.

Purpose of the Study:

  • To investigate novel compact stellarator configurations with enhanced stability and confinement properties.
  • To explore tokamak-stellarator hybrid designs that leverage the advantages of both concepts.

Main Methods:

  • Development of drift-optimized stellarator configurations with tokamak-like rotational transform profiles.
  • Analysis of plasma stability against pressure-driven and current-driven modes.
  • Evaluation of neoclassical confinement and magnetic well properties.

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Main Results:

  • Compact stellarator configurations achieved good neoclassical confinement and stability at high beta.
  • Configurations exhibit tokamak-like rotational transform and poloidally symmetric magnetic field strength.
  • Reduced bootstrap current (1/3-1/5 of tokamak equivalent) enhances stability to kink modes.

Conclusions:

  • Hybrid stellarator-tokamak designs offer a promising pathway to high-beta, stable plasma confinement.
  • Strong magnetic wells contribute to high interchange stability beta limits (up to 23%).
  • Reduced bootstrap current enables higher operational beta (7%-11%) without wall stabilization compared to advanced tokamaks.