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Noninductively Driven Tokamak Plasmas at Near-Unity Toroidal Beta.

D J Schlossberg1, G M Bodner1, M W Bongard1

  • 1Department of Engineering Physics, University of Wisconsin-Madison, 1500 Engineering Drive, Madison, Wisconsin 53706, USA.

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Stable, high-performance tokamak plasmas were achieved using local helicity injection. This method enables sustained toroidal confinement with a very high plasma-to-magnetic pressure ratio (βt) and improved stability for fusion energy research.

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Area of Science:

  • Plasma Physics
  • Fusion Energy Research
  • Magnetohydrodynamics

Background:

  • Achieving sustained, high-performance toroidal plasmas is crucial for fusion energy.
  • Key goals include high plasma-to-magnetic pressure ratio (βt), low internal inductance, high elongation, and non-solenoidal current drive.
  • Tokamak research aims to access this desirable parameter space for efficient fusion.

Purpose of the Study:

  • To demonstrate stable access to a high-performance plasma regime in tokamaks.
  • To investigate the use of local helicity injection for plasma sustainment and heating.
  • To characterize the plasma properties, including βt, internal inductance, and magnetic well depth.

Main Methods:

  • Utilizing plasmas with ultralow aspect ratio and high elongation.
  • Employing local helicity injection for non-solenoidal current drive and sustainment.
  • Performing equilibrium analyses to determine plasma parameters and stability.

Main Results:

  • Stable access to the desirable high-performance parameter space was demonstrated.
  • Local helicity injection successfully provided non-solenoidal sustainment and low internal inductance.
  • Equilibrium analyses indicated achievable βt up to ~100% with a significant minimum |B| well.

Conclusions:

  • Ultralow aspect ratio and high elongation plasmas enable access to high βt regimes.
  • Local helicity injection is an effective method for achieving sustained, low-inductance toroidal plasmas.
  • The demonstrated plasma properties are highly promising for future fusion energy applications.