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微波输入技术是电子回旋共振离子推力器的关键技术之一,输入微波在推力器放电室内产生谐振的时候,微波功率才能高效地被吸收,从而电离气体,提高电子的能量,增加等离子体的电离度。电子回旋共振离子推力器放电室是一个不规则的微波谐振腔,很难从理论上确定其谐振状态下的结构。本文利用网络分析仪,采用微波无源器件回波损耗的测试方法对放电室进行精确调谐,分析微波谐振频率及带宽,目的在于详细研究放电室的结构尺寸、微波耦合探针形状和尺寸在谐振状态下的匹配性。调试结果表明放电室增加14 mm圆柱段,选择圆柱段长度22 mm和球形直径9 mm的组合探针,可以得到较好的谐振状态,此时腔体的回波损耗为-23 dB,谐振频率4.195 GHz,谐振带宽为0.025 0 GHz,品质因素为167.848。
Microwave input technology is one of the key technologies of the electron cyclotron resonance ion thruster. When the input microwave resonates in the thruster discharge chamber, the microwave power can be efficiently absorbed, thereby ionizing the gas, increasing the energy of the electron and increasing the ionization of the plasma degree. Electron cyclotron ion thruster discharge chamber is an irregular microwave resonator, it is difficult to theoretically determine the structure of the resonant state. The purpose of this paper is to study the structure size of the discharge chamber in detail, the shape and size of the microwave coupling probe in the resonance Matching state. The results of the commissioning showed that adding a 14 mm cylindrical section to the discharge chamber and selecting a combination probe with a cylindrical section length of 22 mm and a spherical diameter of 9 mm achieved a good resonance state with a cavity return loss of -23 dB and a resonant frequency 4.195 GHz with a resonant bandwidth of 0.025 0 GHz and a quality factor of 167.848.