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234 Chapter 5 Screen Grid (1.1 kV) Ion Beamlet Screen Grid (1.2 kV) Ion Beamlet Accel Grid (–200 V) Impact at >200 V NSTAR CEX Ions Source of Barrel Erosion (25 V) Impact at only ~25 V (25 V) Accel Grid (–300 V) Decel Grid (0 V) XIPS CEX Ions Source of Pits-and-Grooves Erosion Source of Barrel Erosion Fig. 5-27. Grid cross section comparing charge exchange generation in NSTAR, a two-grid system, with XIPS, a three-grid system. CEX Ions from this Region Recombine on Decel Grid millimeters the length of the region where charge exchange ions that can hit the accelerator grid are generated. This causes a dramatic reduction in the pits-and- grooves erosion between the two thrusters, shown in Fig. 5-28 as calculated using CEX-3D. Although the three-dimensional code CEX-3D is used to predict erosion of the accelerator grid downstream surface, the simpler, two-dimensional CEX-2D code is typically used for accelerator grid aperture barrel erosion calculations because the apertures are cylindrical and the CEX2D code can produce these Plasma Discharge Plasma DischargePDF Image | Fundamentals of Electric Propulsion: Ion and Hall Thrusters
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