The Mpt Microwave Source Development And System Efficiency Analysis

Over the past ten years, with more and more requirements for high performance spacecraft propulsion system, Electric Propulsion (EP) has become highlight of propulsion field because of its unique advantages. Microwave Plasma Thruster (MPT) is a new type of EP, which has high efficiency, moderate Specific Impulse, long life, well compatible with spacecraft and so on. It has wide applying prospect .Microwave Power Supply(MPS) is a main component of MPT which gives MPT energy.At present, MPS has deficiency of large volume, high weight, unstablable output power, especially being unable to be used in vacuum. This paper aimed to develop a new type of MPS which has 200W output microwave and can work in vacuum. In addition, the paper also simply analysed the MPT efficiency on the base ofexperiment.The contents of this paper include:1. Choose the main component element of MPS using related microwave, circuit, heat transfer knowledge,and decide the MPS's forming project. The microwave generator uses magnetron whose power is supplied by switching source, and the instruments' heat elimination is adopted closing water circulation.2. The function of microwave components was detailedly introduced, and the switching supply as well as MPS's heat emission structure was analysed, on the base of which the experimental MPS was made. Some questions were solved which occurred during experiment of MPS, and the sealed box was designed to prevent the high volatge and large microwave power from discharge, as the same time the experimental results were summed up.3.With microwave transmission and electromagnetic field theory, the transferring efficiency of MPT system was analysed, and the results show that MPS and MPT resonant cavity were the main factor influencing MPT whole efficiency.After many examinations, the developed MPS can stably work in atmosphere and vacuum enviroment and has well-behaviour ,which proves it is feasible. The developed MPS together with MPT efficiency gives basis of further improving MPT capability...