Input-output Structure Design And The Entire Configuration Optimization Of A Terahertz Extended Interaction Klystron

With the development of modern industry and science, the application of microwave technology is increasingly widespread, so the energy that can be generated and amplified microwave electronic devices has been put a higher demand. Constituting the main types of microwave vacuum electronic devices, klystron applications can meet this demand. While retaining the traditional basis of the klystron, extended interaction klystron is one of the few devices possessed high ability of high power and high frequency output. As a part of the new research at THz radiation, vacuum electronic devices have become a hot spot in recent years.Firstly, base on the traditional klystron theory analysis, we design coupled cavity chain extended interaction klystron with sheet beam to achieve high frequencies. Here, the input and output coupling waveguide are made of the structure, with four-chamber structure in order to improve its overall gain. Based on numerical calculation and simulation software, it has made a deep analysis of its structure and the high-frequency input and output structures.By optimizing the structure size of input and output coupling part, we improve the performance of the klystron exchange energy. On this basis, we use PIC simulation software to optimize the simulation of the whole structure, under the condition of the electron beam current of 105 mA, the cathode voltage of 13 kV, focusing uniform magnetic field 0.5T and the frequency 224.65 GHz with the input average power 30 mW. It is possible to achieve an average output power of 36 W, efficiency about 2.6%, and gain up to 30.8 d B.Results show that the above design simulation, the design of klystron can operate in the terahertz band. It can be used as one source of microwave radiation, which not only paves the way for the next phase of the experiment, but also provides a possibility for the design of THz klystrons.