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Using a simple model we derive a universal condition for oscillation in a traveling wave tube for frequencies near a band edge, when the adjacent band gap is small. The condition is expressed graphically as a value for the maximum allowable (stable) small signal gain as a function of the size of the band gap. As an example of the application of the general condition, a simple upper bound on the E-plane...
Effect of reflection from the output window on the mode competition in gyrotron is investigated using the equations of quasilinear theory for slowly varying amplitudes of the modes with time delayed terms. Stability analysis of single-mode operation shows that the reflections can, under the certain conditions, strongly affect the operation regime.
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