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Recently developed self-consistent models for beam-wave interaction simulations of a gyrotron oscillator are used to study spurious backward-wave instabilities in smooth-wall metallic beam ducts. Starting from a simple case with a basic geometry, the influence of the beam duct geometry and the magnetic field profile on the instabilities threshold and on the quality of the electron beam are studied.
Silvestro Micera, Simone Romeni
Romain Christophe Rémy Fleury, Benjamin Apffel