The Investigation Of Synchronized High Power Dual-beam Produced With A Single Accelerator

To obtain higher output power is an important development trend of the high power microwave. However, high power microwave sources face the physical barrier of pulse shortening and the technical trouble of impedance matching contradiction of pulse power supply. As a quite optimistic and feasible way, microwave power combination can avoid pulse shortening barrier to some extent, but it cannot overcome the impedance matching contradiction or the synchro-control problem for array elements. In the thesis, a scheme is presented as follows. Firstly, multi-beam electrons are synchronally produced by utilizing one accelerator. Then multi-beam microwave is generated by the multi-beam electrons. At last, the higher power microwave is obtained by means of power combination of the multi-beam microwave. As a primary research, the intensive synchronal dual-beam electrons generated by one accelerator was studied.Firstly, PIC simulation on the dual-cathode diode without confining magnetic field was presented with diode impedance of 10Ωand input voltage of 442.6kV. The results shows that a total beam of 47.6kA, gross power of 20GW, and synchronization precision less than 6ns has been obtained. When dual-beam transmits in a single drift tube, the effects of space electric potential superposition and significant electromagnetic interaction exist between the dual-beam electrons. At the same time, simulation investigation on the transmission characteristics of dual-beam current in dual-drift tube under various control magnetic field modes was presented.Secondly, according to the above simulation results, a control magnetic field mode by using double confining magnetic field solenoides and letting the dual-cathode go deeply into the drift tube where the magnetic field is more symmetrical was adopted. Then, the control magnetic field system for dual-beam was constructed.Finally, the experiment research on dual-beam electrons was presented based on the PIC simulation results. The experimental result of dual-beam electrons bombarding the witness target indicates that, at diode voltage of 442.8kV, total beam of 48.8kA, gross power of 21GW were obtained. The parameters of dual-beam currents were measured with the Faraday cups in the synchronization experiment, and synchronization precision of 4～6 ns was obtained. The experimental result is in a good agreement with the simulation one. Moreover, the experiment of dual-magnetic field solenoids controlling annular dual-beam current was presented. When diode voltage was 380 kV, total beam of 10 kA and effective confining magnetic density of 0.5 Tesla was obtained.