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Velocity-space compression from Fermi acceleration with Lorentz scattering.

J C Waybright1, M E Mlodik1, N J Fisch1

  • 1Department of Astrophysical Sciences, Princeton University, Princeton, New Jersey 08540, USA.

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|February 23, 2022
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Summary
This summary is machine-generated.

This study explores a new Fermi acceleration model where ion collisions create a unique particle acceleration profile. This process can lead to energy peaks in particle distributions, with potential applications in fusion energy and astrophysics.

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Area of Science:

  • Plasma physics
  • Astrophysics
  • Particle acceleration

Background:

  • The Fermi acceleration model explains cosmic ray acceleration via magnetic fields.
  • Collisionless models are standard, but particle interactions can alter acceleration dynamics.

Purpose of the Study:

  • To investigate a modified Fermi acceleration model incorporating Coulomb collisions.
  • To analyze the impact of these collisions on particle energy distribution and phase space.

Main Methods:

  • Simulating light ions interacting with a moving wall.
  • Incorporating pitch angle scattering via Coulomb collisions with heavier ions.
  • Analyzing the resulting stochastic particle acceleration profile.

Main Results:

  • A variation of Fermi acceleration with a stochastic component due to collisions.
  • Demonstration of nonconservation of phase space.
  • Observation of particle energy distributions developing peaks upon compression, deviating from monotonic decrease.

Conclusions:

  • Coulomb collisions introduce a significant stochastic element to Fermi acceleration.
  • The model predicts unusual particle energy distributions with potential peaks.
  • This modified acceleration mechanism could have applications in fusion reactivity and nonthermal astrophysical phenomena.