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Ion Thruster Accelerator Grids 227 (a) (b) Fig. 5-22. NSTAR thruster accelerator grid at (a) 125 hours and (b) 30,352 hours. Fig. 5-23. SEM photograph shows that sputtering in the webbing between the holes had almost destroyed the structural integrity of the NSTAR grids. 5.6.1 Grid Models As discussed above, the primary erosion mechanism of the accelerator grid is caused by sputtering from charge exchange ions. At the simplest level, all that is needed to predict erosion rates is to calculate the number of ions generated in the beamlets, find where they hit the grids, and then to determine the amount of material that they sputter. The total calculated charge exchange ion current accounts for nearly all of the measured accelerator grid current in a properly designed ion thruster (i.e., no direct interception of the beam current). The measured accelerator grid current in NASA’s NSTAR thruster [30] ranged fromPDF Image | Fundamentals of Electric Propulsion: Ion and Hall Thrusters
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