We present a new approach to the computation of thresholds and oscillation frequencies for drive induced oscillation (DIO) and DC oscillation (DCO) in coupled-cavity TWTs. DIO is frequently observed in broadband CC-TWTs under high drive conditions; its occurrence limits the attainable power and/or bandwidth in these tubes. DCO develops under zero drive conditions; its occurrence may generally be avoided by increasing the beam voltage and/or reducing the beam current.
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