On the quasi-collisionality of plasmas with small-scale electric turbulence

  title={On the quasi-collisionality of plasmas with small-scale electric turbulence},
  author={Brett D. Keenan and Mikhail V. Medvedev},
  journal={Journal of Plasma Physics},
Chaotic electromagnetic fields are common in many relativistic plasma environments, where they can be excited by instabilities on kinetic spatial scales. When strong electric fluctuations exist on sub-electron scales, they may lead to small angle, stochastic deflections of the electrons’ pitch angles. Under certain conditions, this closely resembles the effect of Coulomb collisions in collisional plasmas. The electric pitch-angle diffusion coefficient acts as an effective collision – or ‘quasi… 



Quasicollisional magneto-optic effects in collisionless plasmas with sub-Larmor-scale electromagnetic fluctuations.

It is argued that the modified magneto-optic effects in these plasmas provide an attractive, radiative diagnostic tool for the exploration and characterization of small-scale magnetic turbulence, as well as affect inertial confinement fusion and other laser-plasma experiments.

On the Transport and Radiative Properties of Plasmas with Small-Scale Electromagnetic Fluctuations

Plasmas with sub-Larmor-scale (“small-scale”) electromagnetic fluctuations are a feature of a wide variety of high-energy-density environments, and are essential to the description of many

Particle transport and radiation production in sub-Larmor-scale electromagnetic turbulence.

  • B. KeenanM. Medvedev
  • Physics
    Physical review. E, Statistical, nonlinear, and soft matter physics
  • 2013
In the asymptotic regime of very small particle deflections, the pitch-angle diffusion coefficient is directly related to the spectrum of the emitted radiation, which provides much information about the statistical properties of the underlying magnetic turbulence.

Radiative diagnostics for sub-Larmor scale magnetic turbulence

Radiative diagnostics of high-energy density plasmas is addressed in this paper. We propose that the radiation produced by energetic particles in small-scale magnetic field turbulence, which can


Spontaneous rapid growth of strong magnetic fields is rather ubiquitous in high-energy density environments ranging from astrophysical sources (e.g., gamma-ray bursts and relativistic shocks), to

Radiation from particles moving in small-scale magnetic fields created in solid-density laser-plasma laboratory experiments

Plasmas created by high-intensity lasers are often subject to the formation of kinetic-streaming instabilities, such as the Weibel instability, which lead to the spontaneous generation of

Transport of and radiation production by transrelativistic and nonrelativistic particles moving through sub-Larmor-scale electromagnetic turbulence.

This work has investigated the transport of nonrelativistic and trans-relatvistic particles in plasmas with high-amplitude isotropic sub-Larmor-scale magnetic turbulence, and its relation to the spectra of radiation simultaneously produced by these particles.

Collisionless shock experiments with lasers and observation of Weibel instabilities

Astrophysical collisionless shocks are common in the universe, occurring in supernova remnants, gamma ray bursts, and protostellar jets. They appear in colliding plasma flows when the mean free path

Electron acceleration due to high frequency instabilities at supernova remnant shocks

Observations of synchrotron radiation across a wide range of wavelengths provide clear evidence that electrons are accelerated to relativistic energies in supernova remnants (SNRs). However, a viable


Particle-in-cell (PIC) simulations of relativistic shocks are in principle capable of predicting the spectra of photons that are radiated incoherently by the accelerated particles. The most direct