Abstract
In slow wave structures (SWSs) of overmoded relativistic backward wave oscillators (RBWOs), multiple symmetric transversal magnetic (TM0n) modes frequently present coexistence. Since the power capacity of higher order TM0n mode is apparently higher than that of TM01 mode, the introduction of higher order TM0n mode in SWSs seems to be beneficial for improving the power capacity of overmoded RBWOs. However, our analysis indicates that the power capacity of TM0n mixed modes is lower than that of pure TM01 mode, in exception of the condition that the power proportions of higher order TM0n modes are sufficiently high, or the phases of TM0n modes in finitely long SWSs are cautiously manipulated. In addition, we realize that higher mode purity brings about higher power capacity in SWSs.
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