The evolution of electron overdensities in magnetic fields

Details The evolution of electron overdensities in magnetic fields The evolution of electron overdensities in magnetic fields

Jun 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009njph...11f3001m&link_type=abstract

New Journal of Physics, Volume 11, Issue 6, pp. 063001 (2009).

Physics

1

Scientific paper

When a neutral gas impinges on a stationary magnetized plasma an enhancement in the ionization rate occurs when the neutrals exceed a threshold velocity. This is commonly known as the critical ionization velocity effect. This process has two distinct timescales: an ion-neutral collision time and electron acceleration time. We investigate the energization of an ensemble of electrons by their self-electric field in an applied magnetic field. The evolution of the electrons is simulated under different magnetic field and density conditions. It is found that electrons can be accelerated to speeds capable of electron impact ionization for certain conditions. In the magnetically dominated case the energy distribution of the excited electrons shows that typically 1% of the electron population can exceed the initial electrostatic potential associated with the unbalanced ensemble of electrons.

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