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Magnetically Induced Rotating Rayleigh-Taylor Instability
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Rotating instability in low-temperature magnetized plasmas.

Jean-Pierre Boeuf1, Bhaskar Chaudhury

  • 1Université de Toulouse, UPS, INPT; LAPLACE (Laboratoire Plasma et Conversion d'Energie), 118 route de Narbonne, F-31062 Toulouse cedex 9, France and CNRS, LAPLACE, F-31062 Toulouse, France.

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Summary

A novel rotating instability, or "rotating spoke," driven by cross-field currents in magnetized plasma, has been simulated. This instability forms a double layer, crucial for understanding plasma phenomena and critical ionization velocity concepts.

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Area of Science:

  • Plasma Physics
  • Astrophysics
  • Kinetic Theory

Background:

  • Ionization fronts and cross-field currents are key phenomena in magnetized plasmas.
  • Alfvén's critical ionization velocity concept explains initial plasma formation.
  • Understanding plasma instabilities is vital for astrophysical and laboratory contexts.

Purpose of the Study:

  • To demonstrate and explain the formation of a rotating instability (rotating spoke) in a cylindrical magnetized plasma.
  • To analyze the mechanisms of cross-field electron transport induced by this instability.
  • To connect the observed phenomenon to Alfvén's critical ionization velocity concept.

Main Methods:

  • Utilizing a fully kinetic simulation to model plasma behavior.
  • Investigating the dynamics of ionization fronts under specific conditions.
  • Analyzing the resulting electrostatic sheath and particle transport.

Main Results:

  • The first demonstration and explanation of a rotating spoke instability driven by cross-field currents.
  • Identification of the rotating spoke as a strong double layer moving towards higher potentials.
  • Characterization of the instability's velocity relative to the critical ionization velocity.
  • Analysis of electron transport mechanisms induced by the instability.

Conclusions:

  • The study confirms the existence and provides a detailed explanation for the rotating spoke instability.
  • The findings link kinetic plasma simulations to fundamental astrophysical concepts like critical ionization velocity.
  • The research elucidates cross-field electron transport mechanisms driven by this plasma instability.