Large-signal analysis of klystrons: Comparison between experiments and predictions

The paper describes results obtained from calculation of output efficiencies of multicavity klystrons. The theoretical predictions are compared with experimental results. The large-signal computer program used in the analysis is based on a program developed at Cornell University. The input parameters to the program were modified to account for the effect of the drift tube on the r.f. space-charge forces. A test ot the validity of the results from the computer program is obtained by comparing the predicted efficiency as a function of tuning of the penultimate resonator with the experimental results obtained from a 4-cavity C-band klystron. The close agreement obtained shows that the program gives a good description of the r.f. performance for a large variety of large signal conditions.