An experimental wide-band klystron, employing a high perveance hollow beam

A pulsed high power L-band klystron has been designed around a perveance10 \times 10^{-6}hollow beam, operating at 50 kv with a current of 112 amps. Beam convergence is achieved by means of an electron gun having magnetron geometry. This gun has been found to produce a well formed beam with satisfactory r-f properties. The experimental klystron consists of a five cavity driver and a multiple-tuned output circuit. The high beam perveance results in heavy electronic loading of the resonant cavities so that, with stagger tuning, bandwidths of the order of 15% can be attained with output power at megawatt levels.