The coherent Cerenkov radiated power from a group of field-aligned test particles in a magnetoplasma

Details The coherent Cerenkov radiated power from a group of field-aligned test particles in a magnetoplasma The coherent Cerenkov radiated power from a group of field-aligned test particles in a magnetoplasma

Mar 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990p%26ss...38..373f&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 38, March 1990, p. 373-381.

Physics

2

Cerenkov Radiation, Coherent Radiation, Field Aligned Currents, Plasma-Particle Interactions, Plasmas (Physics), Electron Beams, Point Sources, Thermalization (Energy Absorption), Wave Interaction

Scientific paper

An expression is derived that describes the coherent Cerenkov radiated power from a group of test particles in a plasma medium moving parallel to a magnetic field. In this analysis, each particle has an arbitrary position and velocity along a field line and, as a consequence, both the spatial and temporal coherence of the radiation are considered. As an example, it is demonstrated that a monoenergetic electron beam consisting of small pulses can generate wave powers well above incoherent levels if the pulse spacing is comparable to an integer number of emission wavelengths. It is also shown that, if the beam particles have a velocity spread, Delta-V, the wave powers will decrease in time due to the reduced temporal coherence of the particle radiators, where this coherence scales as 1/Delta-V. This latter effect applies to any charged particle beam propagating in a magnetoplasma, because even an initially monoenergetic beam becomes thermalized by electrostatic wave-particle interactions reducing the radiated power.

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