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Instabilities in Self-Focused Electron Beams

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2 Author(s)
Richard A. Gibson ; Department of Physics North Carolina State University Raleigh, North Carolina 27607 ; Willard H. Bennett

The appearance of large amplitude oscillations and attenuation of beam current have been observed in high perveance electrically self-focused beams. These phenomena are shown to be due to instabilities produced by the interaction of the beam with its self-generated plasma. The critical current which must be exceeded for the instabilities to appear and the frequencies of the oscillations have been related to beam and background parameters and the dimensions of the experimental system.

Published in:

IEEE Transactions on Plasma Science  (Volume:2 ,  Issue: 3 )