Abstract
We present the results of a study of the stability of a two-gap input cavity used in an experimental broadband multiple-beam klystron (MBK) with 18-beams and 7-cavities, which was designed for projected > 500 kW maximum output power and 13% bandwidth (NRL MBK-3). The device was experimentally observed to be prone to self-excitation at beam voltages below its design operational value of ∼42 kV. Postexperiment examination of the two-gap input cavity revealed traces of breakdown on its face. Subsequent 3D CEM code simulations showed the presence of a high Q higher-order mode (HOM) TM11. To explore this HOM instability in greater detail, we applied the 2D parallel large-signal code TESLA-MB, which represents a parallel extension of the klystron code TESLA suitable for the accurate modeling of multiple-beam devices.
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