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Ion optics is a critical component of ion thrusters.A two-dimensional axisymmetricmodel is developed to study the characteristics of three-grid electron cyclotron resonance ionthruster optics.The code is based on a particle-in-cell combined with the Monte Carlo collisionmethod to simulate ion dynamics and charge-exchange processes in the grid region.The simulationresults show that the mode can give a reasonable estimate of the physics characteristics of the ionoptics.The design of the ion optics satisfies the requirement of preventing electron backstreaming.Charge-exchange ions can cause damage to the grids,especially to the accelerator grid.’Barrel’erosion can increase the accelerator grid aperture radius at a rate of 1.91×10~(-11)m/s,while thedecelerator grid plays an important role in reducing ’pits-and-grooves’ erosion.
Ion optics is a critical component of ion thrusters. A two-dimensional axisymmetric model is developed to study the characteristics of three-grid electron cyclotron resonance ionthrus optics. The code is based on a particle-in-cell combined with the Monte Carlo collision method to simulate ion dynamics and charge-exchange processes in the grid region. The simulation results show that the mode can give a reasonable estimate of the physics characteristics of the ionoptics. The design of the ion optics is the requirement of preventing electron backstreaming. Charge-exchange ions can cause damage to the grids, especially to the accelerator grid. ’Barrel’ erosion can increase the accelerator grid aperture radius at a rate of 1.91 × 10 ~ (-11) m / s, while thedecelerator grid plays an important role in reducing ’pits -and-grooves’ erosion.