The Study Of The Key Technologies In 140GHz Gyrotron

Currently, the use of nuclear fusion energy is the primary mean to resolve the future of human energy needs. The international communities carry ITER project to get energy to replace non-renewable energy by generating nuclear fusion reactions. Constraints controlled nuclear fusion devices (Tokamak) are composed by a variety of heating systems. The electron cyclotron resonance heating system (ECRH) is the most important Tokamak auxiliary heating system, and its core is a high power gyrotron. With the development of ITER project, Tokamak needs high-power microwave gyrotron that is able to provide frequencies from 110-170 GHz, the output power of several hundred kilowatts (kW) to several megawatts (MW). Currently, Russia, the United States, Germany (EU), Japan and other countries have conducted years of research on the 110-170 GHz high power gyrotron, and have made some progress. The Research work about gyrotron is to forward to higher power, more efficient, continuous wave and stable work.The main studies in this paper include the four parts:1. The paper introducts ECRH development and composition, and makes analysis of the demand of high power gyrotron for ITER. The theoretical work and the principle of high power gyrotron is also introduced. The development of 110-170 GHz high power gyrotron is described and summarized.2. The 140 GHz gyrotron cavity is designed, including cold cavity calculation and hot cavity calculation. Based on the linear theory of gyrotron, select the work mode, design the resonator and carry out the cold cavity calculation. By making the analysis of coupling coefficient and the start-up current, select the appropriate parameters, in order to reduce mode competition. Based on the nonlinear theory of gyrotron, self-consistent nonlinear equations are derived to calculate the electron beam-wave interaction process, and to solve the output power and efficiency of the gyrotron. After analyzing the impact parameter, select the optimal parameters to obtain 140GHz gyrotron cavity design.3. A particle-in-cell (PIC) method is used to simulate the beam-wave interaction process for obtaining the resonant frequency and output power of the cavity. After the electron beam parameter optimization, make analysis of the electron bunching images and output power of 140 GHz gyrotron to validate the results of the programming.4. The 140 GHz double anode magnetron injection electron gun is designed. Based on the electron optical theory and the electron gun empirical formula, and the request of electron beam parameters for the gyrotron cavity, the electron gun is modeled and make programming to calculate to the electron gun by using particle simulation software. Make analysis of the electron gun structure, electric field which influence the electron beam parameters. After a lot of simulation and optimization, we get 140 GHz double anode magnetron injection gun design.