Destruction of trapping oscillations

摘要: A somewhat unconventional traveling wave tube was built to investigate the nonlinear behavior of beam‐plasma instability beyond first trapping oscillation amplitude. In small cold beam limit, equations governing evolution are mathematically identical those describing tube. The has advantage that slow structure will remain linear for amplitudes reached in experiments; furthermore, it does not introduce noise. Five trapped particle oscillations observed following saturation a single launched wave. Two mechanisms destroying these have been found. involves damping and can occur decrements smaller than 0.01 k0. second is result modulation main by unstable sidebands. addition experiments, which describe interaction solved numerically. experimental observations excellent...