Electron beam injection experiments - The beam-plasma discharge at low pressures and magnetic field strengths

Details Electron beam injection experiments - The beam-plasma discharge at low pressures and magnetic field strengths Electron beam injection experiments - The beam-plasma discharge at low pressures and magnetic field strengths

Feb 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978georl...5..127b&link_type=abstract

Geophysical Research Letters, vol. 5, Feb. 1978, p. 127-130.

Physics

6

Dense Plasmas, Electron Beams, Low Pressure, Magnetic Flux, Plasma Jets, Plasma-Particle Interactions, Cyclotron Frequency, Noise Spectra, Photometry, Radio Spectra

Scientific paper

The paper describes electron beam injection experiments which clarify observational results obtained in rocket flights. A column of enhanced density plasma, exceeding the density expected from ionization by primary beam electrons, was observed in a large vacuum system at low magnetic fields (1 to 1.5 G) and low ambient pressures (10 to the minus 6 to 10 to the minus 5 torr). The peak luminosity of the discharge was about 10 times that of the beam alone, and the radius increased by a factor of three. In the absence of the discharge, RF emission is observed at 1.1 to 1.2 times the cyclotron frequency, and a strong band of RF noise with upper frequency cutoff at about the cyclotron frequency is observed in the discharge mode, along with higher frequency noise at or near the plasma frequency. The onset of the plasma discharge is critically dependent on beam current. The described results agree with observations obtained at much higher densities and magnetic fields in fusion research studies.

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