Inductively loaded wide-gap designs for relativistic klystrons

Martin Lampe; Richard F. Hubbard; Moshe Friedman; Victor Serlin; S. P. Slinker; R. F. Fernsler; Denis G. Colombant

doi:10.1117/12.175773

13 May 1994 Inductively loaded wide-gap designs for relativistic klystrons

Martin Lampe, Richard F. Hubbard, Moshe Friedman, Victor Serlin, S. P. Slinker, R. F. Fernsler, Denis G. Colombant

Proceedings Volume 2154, Intense Microwave Pulses II; (1994) https://doi.org/10.1117/12.175773
Event: OE/LASE '94, 1994, Los Angeles, CA, United States

Abstract

As the power and the frequency of a relativistic klystron increase, design of both modulation and extraction cavities becomes increasingly difficult. If the gap is narrow, the rf electric field begins to exceed limits for electron emission or breakdown. On the other hand, if the gap width exceeds a small fraction of a wavelength, typical extraction modes do not couple well, and space charge potential energy reduces efficiency and limits the current that can cross the gap. We present theoretical investigations of a novel gap design that incorporates an inductively loaded return-current structure. This structure serves to neutralize the dc space charge of the beam, while sustaining the longitudinal rf field that extracts the microwave energy. With appropriate choice of resonant modes, it appears that gap widths exceeding a half wavelength can be used for modulation of high-current beams, as well as extraction of rf energy with high efficiency.

Citation Download Citation

Martin Lampe, Richard F. Hubbard, Moshe Friedman, Victor Serlin, S. P. Slinker, R. F. Fernsler, and Denis G. Colombant "Inductively loaded wide-gap designs for relativistic klystrons", Proc. SPIE 2154, Intense Microwave Pulses II, (13 May 1994); https://doi.org/10.1117/12.175773

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