Emi-varian Limited

John P Randall

Dudley Perring

Michael J Smith

A linear beam tube has an input section, a buffer or buncher section, and an output section. The buffer or buncher section comprises two circuits in series, each of which (FIG. 5) comprises two resonant cavities C51 and C52 through which the electron beam passes and a third resonant cavity C53 coupled to cavity C51 by a slot 53 and to cavity C52 by a slot 54. The output section (FIG. 2a) comprises two resonant cavities C1 and C2 through which the beam passes and which are coupled by a slot 5. A third resonant cavity C3 is coupled to cavity C2 by an iris 13, and to an output waveguide 14 by a further iris 15. The input section may comprise a travelling wavetube section, or the series arrangement of a standard klystron cavity and two buffer sections as shown in FIG. 5. Slot or iris couplings may be replaced by a loop coupling as known in the art. The resulting amplifier has an improved bandwidth/efficiency product.

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Hillingdon, United Kingdom

John P Randall