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C J McDevitt1, Xian-Zhu Tang, Zehua Guo

  • 1Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.

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A new mechanism drives bootstrap current in collisionless plasmas via resonant electron scattering. This microturbulent process complements neoclassical collisional effects, impacting tokamak reactor plasma currents.

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Area of Science:

  • Plasma Physics
  • Fusion Energy Research
  • Kinetic Theory

Background:

  • Neoclassical bootstrap current is crucial for tokamak reactor equilibrium plasma currents.
  • Existing models rely on collisional effects to establish electron equilibrium.

Purpose of the Study:

  • To investigate a novel mechanism for driving bootstrap current in collisionless plasmas.
  • To explore the role of resonant electron scattering by drift wave microturbulence.
  • To quantify the interplay between collisional and microturbulent mechanisms.

Main Methods:

  • Utilized a linearized Fokker-Planck collision operator.
  • Modeled resonant scattering of electrons by drift wave microturbulence.
  • Computed plasma current considering both collisions and scattering.

Main Results:

  • Demonstrated that resonant electron scattering can drive bootstrap current in collisionless plasmas.
  • Showed this microturbulent mechanism establishes equilibrium between trapped and passing electrons.
  • Quantified the relative contributions of collisional and scattering mechanisms.

Conclusions:

  • Resonant scattering offers an alternative pathway to bootstrap current generation.
  • Microturbulence can significantly influence plasma current profiles in tokamaks.
  • Understanding these mechanisms is vital for future fusion reactor designs.