Abstract
Some of the factors which must be considered in the design of a multi-cavity klystron are examined. The electron beam and cavities should be designed so as to maximize a figure of merit—the product of the voltage gain and the bandwidth of one stage of the amplifier. The limitations on the low-level bandwidth obtainable imposed by the effects of the couplings between non-adjacent cavities can be minimized by the appropriate choice of the number and separation of the cavities. In terms of the simple space-charge-wave theory the cavities should be separated by a quarter of a plasma wavelength, but consideration of the higher-order space-charge modes shows that the optimum spacing depends on the exact beam configuration. The high-level bandwidth can be maximized by the correct design of the output cavity and external circuit, but the results which can be obtained depend on the behaviour of the electron beam at high signal levels. The theory of this, and of the debunching behaviour of the beam at long drift lengths, is not well established, and an experimental approach is required.
Published Version
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