关键词: 电子回旋共振离子推力器;微波;谐振;信号调试

Abstract: The microwave input technology is one of key technologies of electron cyclotron resonance ion thruster. When the input microwave resonates in the discharge chamber, the microwave power can be absorbed efficiently. Thus gas is ionized to produce high degree plasma. The discharge chamber of electron cyclotron resonance ion thruster is an irregular microwave resonant cavity. It is difficult to determine its resonant condition and the optimum structure theoretically. Here the network analyzer and the microwave passive component return loss test method are used to tune the discharge chamber harmoniously and analyze the matching between microwave resonant state, frequency and its band width and the discharge chamber structure as well as microwave coupling probe shape. The experiment results indicate that at resonance frequency of 4.195 GHz discharge chamber with a cylinder section in 14mm length and with a combined probe of 9 mm in spheric diameter and 22 m in cylindric length the thruster discharge chamber resonant condition is at optimum state, where the return loss is lowest, -23 dB,and the band width is 0.025 0 GHz.The quality factor Q is 167.848.

Key words: Electron cyclotron resonance ion thruster; Microwaue;Resonance; Regulation