Dissipative instability of overlimiting electron beam in a nonuniformcross-section waveguide

Institute of Radiophysics and Electronics, National Academy of Sciences of Armenia - 1 Alikhanyan str., Ashtarack, 378410, Armenia

Corresponding author: evrostom@freenet.am

Received: 12 September 2006
Accepted: 12 December 2006

Abstract

The effect of dissipation on the instability caused by growing of the slow space charge wave of electron beam is studied. High level of dissipation leads to a new type of dissipative streaming instability. Its growth rate has a previously unknown, inverse proportional dependence on dissipation. The new dependence is a result of superposition of two factors, both of which lead to excitation of the beam wave with negative energy: increasing of beam current and dissipation. Basic parameters of the instability indicate that it can be an important additional factor upon design of high-power high-frequency devices based on relativistic e-beams.