Figure 1
(click on image for figure alone)
Fig. 1. A 100 eV electron beam is injected into a neutral gas
without applying external electric or magnetic fields. The beam
light starts very close to the cathode indicating that the
electrons acquire their full energy in a very thin cathode
sheath. Thus, the self-produced plasma acts as an anode. The
initial beam convergence indicates concave equipotential
surfaces near the cathode, presumably due to a radial density
gradient. The beam scatters by collisions and beam-plasma
instabilities.
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Last Revision: 25 January 2000.