首页|An integrative mathematical model of microwave ion thruster for mHz-frequency thrust noise analysis
An integrative mathematical model of microwave ion thruster for mHz-frequency thrust noise analysis
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Many high-precision space missions need thrusters to produce thrust with low noise to compensate for disturbances and ensure satellite platform stability.Microwave ion thruster is char-acterized with a wide thrust range and potential for these missions.A cost-effective and accurate mathematical model is crucial for mHz-frequency thrust noise analysis and feedback controller design.The Particle-In-Cell(PIC)and global models are two common simulation tools.The PIC model is characterized with high accuracy but huge computation cost,which is difficult to analyze long-time performance characteristics.Now,the global model is only used for the discharge cham-ber with low accuracy and cannot reflect ion extraction properties.In this paper,an integrative mathematical model is built for a 1-cm microwave ion thruster and can reflect ion beamlet diver-gence and impingement on the Accelerator Grid(AG).Simulation results show good agreement with experiments at 0.06 sccm.However,the model demonstrates worse consistency with experiments when the flux increases to 0.1 sccm,which may be because the influence of neutral gas on the Electron Cyclotron Resonance(ECR)is not considered in the model.A long-time(1000 s)simulation is conducted with this model under 35 μN.It takes 3 hrs,and the thrust noise reaches 1 μN/Hz0.5 at 1 mHz.
Electric propulsionMicrowave ion thrusterIntegrative modelSheath propertyIon beamlet divergenceThrust noisePlasma
Xiang NIU、Hui LIU、Daren YU
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Plasma Propulsion Laboratory,Harbin Institute of Technology,Harbin 150001,China
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