Space charge effects during the injection of dense electron beams into space plasmas

Details Space charge effects during the injection of dense electron beams into space plasmas Space charge effects during the injection of dense electron beams into space plasmas

Jun 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....92.6114w&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 92, June 1, 1987, p. 6114-6126.

Computer Science

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29

Beam Injection, Plasma-Particle Interactions, Space Charge, Space Plasmas, Spacecraft Charging, Atmospheric Sounding, Electron Beams, Pulsed Radiation

Scientific paper

One-dimensional electrostatic particle simulations are used to investigate the injection and propagation of intense electron beams and the plasma response to the beam injection. Beam densities greater than about the plasma density are considered. It is shown that if the injection is continuous, most of the beam electrons are drawn back into the spacecraft because of the buildup of positive charge on the spacecraft. Those electrons which are able to propagate away from the spacecraft are emitted periodically because of space charge oscillations induced by electric fields associated with the beam. A substantial increase in the fraction and average energy of electrons which can propagate away can be obtained if the injection is changed to periodic pulses having width and period matched to the induced space charge oscillations.

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