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在2.45 GHz同轴型微波等离子体推力器中加入磁场可以提高推力器的性能。这是由于磁场的存在,在推力器启动阶段会形成电子回旋共振区;稳定工作时,等离子体获得的焦尔热比没有磁场时高,这些都增加了等离子体吸收的微波能量。以氩气为工质,对外加磁场微波等离子推力器进行了实验研究,结果表明,推力器可以达到较高的耦合效率。对等离子体羽流的诊断则表明,外加磁场提高了推力器谐振腔内工质气体的电离度。
Adding a magnetic field to a 2.45 GHz coaxial microwave plasma thruster increases thruster performance. This is due to the presence of a magnetic field, which forms an electron cyclotron resonance region during the start-up of the thruster. In stable operation, the Joule heat obtained by the plasma is higher than when no magnetic field is present, and these increase the microwave energy absorbed by the plasma. Argon as the working fluid, an applied magnetic field microwave plasma thruster was studied experimentally, the results show that the thruster can achieve higher coupling efficiency. The diagnosis of plasma plume shows that the applied magnetic field increases the ionization degree of the working gas in the thruster resonator.