Injection and propagation of a nonrelativistic electron beam and spacecraft charging

Details Injection and propagation of a nonrelativistic electron beam and spacecraft charging Injection and propagation of a nonrelativistic electron beam and spacecraft charging

Jan 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....93..175o&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 93, Jan. 1, 1988, p. 175-195.

Computer Science

Sound

14

Beam Injection, Computerized Simulation, Electric Fields, Electron Beams, Magnetic Fields, Spacecraft Charging, Artificial Satellites, Magnetohydrodynamic Stability, Plasmas (Physics), Sounding Rockets, Spacelab, Wave Generation

Scientific paper

Two-dimensional numerical simulations have been carried out in order to study the injection and propagation of a nonrelativistic electron beam from a spacecraft into a fully ionized plasma in a magnetic field. Contrary to the earlier results in one dimension, a high-density electron beam whose density is comparable to the ambient density can propagate into a plasma. A strong radial electric field resulting from the net charges in the beam causes the beam electrons to spread radially, reducing the beam density. When the injection current exceeds the return current, significant charging of the spacecraft is observed along with the acceleration of the ambient electrons back to the spacecraft. As a result, a beam current much larger than the thermal return current can be injected into space. Recent data on the electron beam injection from the Spacelab 1 (SEPAC) are discussed.

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