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Updated: May 10, 2026

Magnetically Induced Rotating Rayleigh-Taylor Instability
06:42

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Published on: March 3, 2017

Negative-mass instability in nonlinear plasma waves.

I Y Dodin1, P F Schmit, J Rocks

  • 1Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543, USA.

Physical Review Letters
|June 11, 2013
PubMed
Summary
This summary is machine-generated.

The negative-mass instability in plasma waves is identified as a distinct sideband instability regime. This occurs due to particle bunching in nonlinear waves, even with flat distributions, challenging existing theories.

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Area of Science:

  • Plasma physics
  • Nonlinear dynamics
  • Beam-plasma interactions

Background:

  • The sideband instability is a known phenomenon in plasma waves with trapped particles.
  • Previous theories often linked instabilities to the anharmonicity of particle oscillations.

Purpose of the Study:

  • To identify and characterize the negative-mass instability as a distinct regime of sideband instability in nonlinear plasma waves.
  • To develop a generalized analytical model for this instability.

Main Methods:

  • Theoretical modeling of particle dynamics in nonlinear plasma waves.
  • Particle-in-cell (PIC) simulations to validate theoretical predictions.

Main Results:

  • The negative-mass instability arises from particle bunching when the action distribution is inverted in trapping islands.
  • Spatial periodicity of trapping islands is found to be unimportant for instability.
  • The particle distribution can be unstable even if it is flat at resonance, contrary to some existing theories.
  • A generalized analytical model is proposed, encompassing single traps and periodic waves.

Conclusions:

  • The negative-mass instability represents a significant regime of sideband instability in nonlinear plasma waves.
  • The proposed model offers a concise generalization of existing sideband instability theories.
  • Simulation results confirm the theoretical findings, particularly for regimes emphasizing the negative-mass instability.