电子回旋共振推力器中和器内磁场与微波电磁场计算分析

Magnetic and high-frequency electromagnetic field analysis in neutralizer of electron cyclotron resonance thruster

电子回旋共振推力器具有寿命长、比冲高、结构简单等特点,用于深空探测主推进具有很大的吸引力。中和器是电子回旋共振推力器的关键部件之一,其主要作用为产生电子,中和离子源发射的离子束流,它对保持电子回旋共振推力器的电位平衡有着重要作用。文中针对10 cm推力器的中和器,采用ANSYS有限元分析软件建立了磁路模型,计算了中和器内磁场分布,得出了方案中电子回旋共振面的位置。针对中和器的工作特点,设计了多种天线方案,利用ANSYS软件计算了其对应的电磁场分布。计算结果表明,设计磁场提供的电子回旋共振面位置合理,L型天线方案可实现放电击穿,产生等离子体。计算结果对电子回旋共振推力器的中和器设计与研制提供了帮助。

Electron cyclotron resonance thruster has the advantages of cathodeless operation, high specific impulse and simple structure which make the thruster very attractive for deep space exploration. Its neutralizer is the key component, which works for producing electrons used to neutralize the ion beams from discharge chamber. The neutralizer are very important for keeping the thruster neutral. It is one of the key influencing factors for thruster＇s stable operation. Hence the numerical simulation and analysis of the fields inside the neutralizer are very important for its study. Three models with different shape antennas of 10 cm thruster＇s neutralizer for high-frequency electromagnetic field calculation and one model for magnetic field calculation were established with finite element analysis software. With the models, the field distribution was calculated and analyzed. The conclusions show that the location of electron cyclotron resonance surface in magnetic field model is rational. The neutralizer with the L shape antenna can produce plasma reliably.