Abstract
Higher-order space-charge waves on solid cylindrical electron beams produced by shielded or nearly shielded guns have only azimuthal periodicity, as in hollow beams. Because of beam rotation, they are members of a broad class of space-charge waves which can travel faster than the beams themselves, either forwards or backwards. The properties of such waves for the beam in a drift tube and in a concentric sheath helix are derived from a slow-wave, small-signal analysis and the appropriate boundary equations. Experimental observations of their interaction with harmonic fields of a helix, as well as of their role in noise propagation, tend to confirm the results of these computations.
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