.0.1 The Thz Extend The Theory And Design Of The Interaction Cavity

Terahertz wave is an electromagnetic wave which is in region from 0.1THz to 10THz, and it has attracted more and more attention while people found that it has some unique properties other waves band does not have. The research of THz technology is in the initial stage, it is difficult to design the devices of radiation sources which can produce the THz wave and it has been a problem by now, so the research and design of Terahertz wave source have become one of the focuses in region of THz technology recently. In the past, it was hard to achieve the frequency of THz wave as the size of the sources structure could not be manufactured smaller and the processing technology was not advanced for the traditional Vacuum Electron Devices (VED). However, many new types of Micro-Vacuum Electron Devices (μVED) have been created and developed fast and achieved the frequency of THz wave as far as possible, because the processing technology of THz wave such as LIGA, EDM, DRIM developing rapidly in recent years.Extended Interaction Oscillator (EIO) is millimeter-wave radiation source which can produce high-power and high efficiency in the millimeter-wave band. It had been accepted widely in international community, because it has many advantages of application in many areas such as high-power millimeter-wave radar, electronic countermeasures, directed energy weapons, material treatment, and amplifier. The main work of the dissertation was to research and design 0.1THz EIO.First, the characteristics of slow-wave system were analyzed for designing the role of structure of EIO. Second, I studied the role of a structure to EIO model and analyzed the dispersion characteristics of the system. Third, I reformed the structure to simplify the system. Fourth, Using Computer-aided design software CST and MAGIC that a usable role of EIO was designed and simulated. Finally, the geometrical and electrical parameters were optimized to improve the capabilities of EIO. The results showed that the EIO worked well and it could excite the mode of TM110 electromagnetic wave which had electric field strength of 18.1GV/m and frequency of 110.675GHz when the operation electron beam voltage would be 15kV and the operation electron beam current would be 240mA as the operation electron beam current density would be 100A/cm2. The mode of TE01 electromagnetic wave could be detected at the output window, then its output average power could be 392W and energy conversion efficiency could be 10.89%, the goal of designing a high-power terahertz radiation source was achieved.