Accelerator grid 1 Charge Exchange (CEX) ions 1 Charge exchange ion 1 Charge transfer 1 Charge-exchange Electric fields 1 Erosion 1 Exchange ions 1 Grid erosion 1 IFE-PIC-MCC 1 Immersed finite elements 1 Immersed-finite-element particle-in-cell monte-carlo-collision 1 Ion exchange 1 Ion propulsion 1 Ion thruster 1 Ions 1 Monte Carlo collision 1 Monte Carlo methods 1 Morphology 1 Particle in cell 1 Plasma sheaths 1