Self-consistent turbulent acceleration of electrons to suprathermal energies

Details Self-consistent turbulent acceleration of electrons to suprathermal energies Self-consistent turbulent acceleration of electrons to suprathermal energies

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsm33c0466r&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #SM33C-0466

Physics

Plasma Physics

2114 Energetic Particles (7514), 2451 Particle Acceleration, 2471 Plasma Waves And Instabilities (2772), 2772 Plasma Waves And Instabilities (2471), 7514 Energetic Particles (2114)

Scientific paper

It was known since the early days of plasma physics research that suprathermal electrons are generated during beam-plasma laboratory experiments. Suprathermal electrons, often modeled by κ distribution, are also ubiquitously observed in space. Various particle acceleration mechanisms have been proposed to explain such a feature, but all previous theories rely on either qualitative analytical method or on non self-consistent approaches. Self-consistent acceleration of electrons in the context of plasma turbulence theory has not been demonstrated to this date. This paper reports such a demonstration for the first time. It is shown that the collisionality, defined via the so-called ``plasma parameter''g=1/ncirc λDe3, plays a pivotal role. It is found that small but moderately finite value of g is necessary for the suprathermal tail to be generated. The upshot is that purely collisionless Vlasov theory cannot produce suprathermal population. Recently, an alternative approach to understanding the κ distribution has been put forth, which does not involve turbulent acceleration at all, but instead rely on an alternative thermodynamical concept called the ``nonextensive'' entropy. The present paper takes a more traditional view in that, the discussion is implicitly confined to the conventional Boltzmann-Gibbs statistics, upon which the present-day plasma physics is largely based.

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