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

W. Bernstein, H. Leinbach, P. Kellogg, S. Monson, T. Hallinan, O. K. Garriott, A. Konradi, J. McCoy, P. Daly, B. Baker, H. R. Anderson

Research output: Contribution to journalArticlepeer-review

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Abstract

A column of enhanced density plasma, exceeding the density expected from ionization by primary beam electrons, has been observed in a large vacuum system at low magnetic fields (1 to 1.5 G) and low ambient pressures (10−6 to 10−5 torr). The peak luminosity of the discharge is about 10 times that of the beam alone, with a radius increase by a factor of 3. In the absence of the discharge, RF emission is observed at 1.1 to 1.2 fc. A strong band of RF noise with upper frequency cutoff at about fc 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 present results agree with observations made at much higher densities and magnetic fields in fusion research studies.

Original languageEnglish (US)
Pages (from-to)127-130
Number of pages4
JournalGeophysical Research Letters
Volume5
Issue number2
DOIs
StatePublished - Feb 1978

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