Design and Simulation Investigations of Single Dual Frequency Relativistic Backward Wave Oscillators

Abstract

In recent years, the development of High-power microwave (HPM) sources has been very popular in the microwave community due to its various civilian and military applications. The main purpose of HPM sources is to deliberately disrupt or destroy electronic equipment without harming the infrastructure or harming the humans. The generation of RF power by HPM sources from KW s to GW s in the frequency range from GHz to THz with single and dual-frequency by a single HPM device has drag the attention of researchers and academia around the world for RandD in this domain. There are many HPM sources to generate high power using Relativistic electron beam such as Relativistic Klystron, Relativistic Backward Wave Oscillator (RBWO), Relativistic Magnetron, Magnetically Insulated Line Oscillator (MILO), fast wave devices such as gyro devices and space-charged devices such as Vircator and FEL and these devices are still in active research in many countries. Above all, Relativistic Backward Wave Oscillator (RBWO) is one of the most prominent slow-wave relativistic device used in many applications like E-bomb and Directed Energy Weapons (DEW) applications, and it is more promising HPM source in terms of design, efficiency, repetition rate, and frequency tunability. The only drawback is that it requires a strong external guiding magnetic field. This makes this device cumbersome and can be overcome. Since most applications are used with the help of ground-based stations, I chosen S- and C-bands frequency of operation for my research work. In the present thesis, the author has designed and simulate the S-band RBWO by considering an experimentally demonstrated S-band overmoded RBWO and the Trapezoidal resonant reflector has been replaced with resonant reflector to enhances the pre-modulation during electron beam propagation, thus increasing the generated RF signal overall efficiency and coherency. In addition, the pulse shortening study is analyzed by considering its various mechanisms in MAGIC-PIC simulations. newline