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Radiative intermittent events during Fermi's stochastic acceleration.

Alessandro Veltri1, Vincenzo Carbone

  • 1Dipartimento di Fisica, Universitá della Calabria, 87036 Rende (CS), Italy.

Physical Review Letters
|April 20, 2004
PubMed
Summary
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This study explores Fermi's acceleration mechanism with a charged particle between moving plates. Radiation drag limits particle energy, and emitted energy shows intermittent, non-Gaussian bursts, revealing unique dynamics.

Area of Science:

  • Plasma physics
  • Astrophysical particle acceleration
  • Statistical mechanics

Background:

  • Fermi's acceleration mechanism describes how particles gain energy in astrophysical plasmas.
  • Stochastic processes are crucial for understanding particle dynamics in complex environments.
  • Radiation damping affects charged particle motion and energy gain.

Purpose of the Study:

  • To investigate the dynamics of a charged particle undergoing relativistic acceleration between two stochastically moving reflecting plates.
  • To analyze the role of radiation during particle collisions in this system.
  • To characterize the statistical features of the radiated energy.

Main Methods:

  • Simulating a charged test particle oscillating between two randomly moving reflecting plates.

Related Experiment Videos

  • Incorporating energy radiation during particle-plate collisions.
  • Analyzing the energy gain of the particle and the statistical properties of the radiated energy.

    • Main Results:

    • Particle energy gain is bounded due to radiation drag.
    • Radiated energy exhibits an on-off intermittent process, characterized by frequent small emissions and rare intense bursts.
    • The intermittent radiative process displays non-Gaussian statistical features.

    Conclusions:

    • Radiation drag fundamentally alters Fermi's acceleration mechanism, leading to bounded particle energies.
    • The intermittent nature of energy radiation is a key characteristic of this system.
    • The non-Gaussian statistics of radiated energy provide insights into particle acceleration dynamics.