The Inner Coaxial Mode Relativistic Bwo Characteristics

This dissertation focus mainly on an Inner Coaxial X band Overmoded Relativistic Backward-Wave Oscillators with rectangular corrugation slow wave structure (SWS) .Several achievements are listed as the followings:1. The dispersion relation of the SWS is deduced in detail according to the Maxwell's Equation and the Floquet Theory. The dispersion characteristic expression of TM 0n electromagnetic mode is programmed and the dispersion curve is calculated. For the structure period and amplitude of the disk-loaded corrugation numerical analysis is carried out and the dispersion curves are gotten.2. The expression of the coupling impedance is obtained according to the field matching method. The effects of the structure parameter on coupling impedance are discussed with numerical calculations.3. The beam-wave interaction of the device is simulated and optimized by PIC method. Some important parameters of effecting the output power and efficiency are discussed in detail.4. The partial inner coaxial and partial electron beam are simulated and optimized by PIC method also. Some important effects on the output power and microwave radiation frequency are obtained.The results of the study show that RBWO has unique advantages: overmoded slow wave structure allows the system power capacity increasing largely. This will heavily decrease the space charge effects compared to the smaller radius beam with the same current. Hence the RBWO can work well with a lower axial guide magnetic field. The electromagnetic field distribution has great advantage of effective electron beam and the electromagnetic wave interaction. It is a kind of promising high power microwave device.