Klystrons with Double-gap Bunchers†

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Abstract
The use of double-gap bunching in klystrons is investigated theoretically and it is shown that under suitable conditions the beam coupling coefficient may be 40% higher than for a single gap. Also, the loading of the buncher by the beam under these conditions may be eliminated. It is estimated that the double-gap buncher can improve the overall gain by about 6 dB. The theoretical results have been confirmed in a positive-ion klystron operating at a frequency of 5 Mc/s.

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