Further laboratory measurements of the beam-plasma discharge

Details Further laboratory measurements of the beam-plasma discharge Further laboratory measurements of the beam-plasma discharge

Dec 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jgr....84.7271b&link_type=abstract

Journal of Geophysical Research, vol. 84, Dec. 1, 1979, p. 7271-7278. NASA-supported research.

Physics

10

Beam Plasma Amplifiers, Electron Beams, Neutral Gases, Plasma Diagnostics, Plasma Jets, Aerospace Technology Transfer, Beam Currents, Cyclotron Frequency, Magnetohydrodynamic Stability, Particle Collisions

Scientific paper

The paper presents laboratory measurements of the beam-plasma discharge (BPD) produced when an energetic electron beam traverses an initially neutral gas. The results show that the critical beam current is related to energy, magnetic field, and the system length by an empirical relationship at pressures below 2 times 10 to the -5th power torr. This relationship describes the accumulation of ambient plasma density collisionally produced by the beam to a critical value at which ignition occurs. Additional measurements of the narrow-band cyclotron-related waves observed at beam currents below BPD threshold do not clearly establish whether this instability is a precursor to the BPD.

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