Development of wide-band, high power, cross-field amplifiers at X and Ku band

Two programs to develop stable, wide-band, high gain, high power crossed-field amplifiers of linear format were recently completed. These amplifiers operate in x and Ku band with 23 db gain and a CW power output of up to 2 kw and 600 watts respectively. 20% bandwidth has been achieved on both tubes. Both tubes utilized severed circuits. The tubes have been packaged in permanent magnets featuring a high degree of magnetic shielding through the use of a soft iron return circuit surrounding the high-coercive force magnetic material that is used. This paper details the electrical design procedure and points out the salient features of the tube design. It also summarizes the results of the testing of the tubes and the correlation of the results with the design approaches used.