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A momentum‐balance model of electron beam propagation through plasma into vacuum

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2 Author(s)
Reiser, M. ; Electrical Engineering Department and Laboratory for Plasma and Fusion Energy Studies, University of Maryland, College Park, Maryland 20742 ; Chang, C.R.

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A model is proposed which links electron beam propagation through plasma into a vacuum with collective ion acceleration from the plasma. Electron reflection from the virtual cathode at the beam front transfers momentum to the ions, and a moving ion channel is formed allowing the electron beam to propagate. A momentum‐balance equation is derived, and theoretical results for the ion velocity are in good agreement with the experimental data. Conditions for transverse beam confinement are discussed.

Published in:

Journal of Applied Physics  (Volume:58 ,  Issue: 10 )