Compact Ka-Band Generator of Microwave Superradiative Pulses

Summary form only given. Investigation results of highly effective energy exchange between electron beam and electromagnetic wave in nonstationary, superradiative Ka-band BWO (SR BWO) under conditions of beam transportation in decreased (less than the cyclotron-resonance value) magnetic field of ~ 2 T are presented. In our previous studies with such conditions the conversion of e-beam power into SR pulse did not exceed value of 0.5 and only under strong magnetization of particles with the field of ~ 6.5 T conversion attained 1.4. In the course of present investigations a detailed numerical PIC-simulation of SR BWO with decreased guiding magnetic field (~1.7 T) was performed. We optimized the parameters of accelerating voltage pulse and e-beam current as well as the distribution of beam-to-wave coupling along the BWO interaction space due to a variation in the geometry of slow-wave svstem corrugation and shaping of the field lines of magnetic guiding system. It was shown that conversion of beam power into 0.3-ns width electromagnetic pulse could be close to unity. In this case, SR power of 450 MW, equal to the power of driving beam was predicted. Experiments with the use of compact stabilized electron accelerator RADAN-303BP demonstrated that BWO operates in the mode, which is very close to that obtained in the numerical simulation and the measured SR peak power was as high as 380-480 MW. The decreased guiding magnetic field makes it possible to use the pulse-repetitive solenoid with relatively low energy consumption of ~ 150 J per pulse. In the report, we intend to present the characteristics of a commercial version of microwave device that allows the operating mode with pulse repetition rate of up to 10 pps.