The dispersion relation of quasi- TE l s modes in sinusoidally corrugated metal wall slow wave structure with an annular electron beam is derived and analyzed numerically. Results of the numerical analysis for quasi- TE 11 mode and conventional TM 01 mode are compared with experimental results. TE 11 mode in addition to TM 01 mode microwave oscillation is observed near 2π mode region of operation. It is confirmed that oscillation property of both modes agree fairly well with numerically predicted values. The study of quasi-TE mode oscillation is required for an optimum design of a high power backward wave oscillator that works in a single frequency over a wide range of operating conditions.
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Tanaka et al. (1998) studied this question.
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