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Related Experiment Videos

Inductive and electrostatic acceleration in relativistic jet-plasma interactions.

Johnny S T Ng1, Robert J Noble

  • 1Stanford Linear Accelerator Center, Stanford University, Stanford, California 94309, USA.

Physical Review Letters
|April 12, 2006
PubMed
Summary

Numerical simulations reveal rapid particle acceleration in relativistic jets. Positron momentum significantly increased due to plasma instabilities, particularly Weibel instability.

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Area of Science:

  • Plasma Physics
  • Astrophysical Jets
  • Computational Electromagnetics

Background:

  • Relativistic jets are crucial in high-energy astrophysics.
  • Understanding particle acceleration mechanisms within these jets is a key challenge.
  • Plasma instabilities play a significant role in energy transfer and particle dynamics.

Purpose of the Study:

  • To investigate particle acceleration in relativistic electron-positron jets interacting with electron-ion plasmas.
  • To identify the underlying physical mechanisms driving rapid particle acceleration.
  • To explore the role of plasma instabilities in this process.

Main Methods:

  • Three-dimensional, electromagnetic, particle-in-cell (PIC) computer simulations.
  • Modeling a charge-neutral, narrow, electron-positron jet propagating through an unmagnetized plasma.

Related Experiment Videos

  • Analyzing the excitation of magnetic filamentation and electrostatic plasma instabilities.

    • Main Results:

    • Observed rapid particle acceleration, with positron longitudinal momentum increasing by up to 50% (max gain > 2).
    • Generated longitudinal electric fields reached the cold plasma-wave-breaking limit.
    • Particle acceleration was linked to the satisfaction of Weibel instability criteria.

    Conclusions:

    • Relativistic jet-plasma interactions can lead to significant particle acceleration.
    • Plasma instabilities, including Weibel instability, are key drivers of this acceleration.
    • PIC simulations are effective tools for studying these complex astrophysical phenomena.