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Flight Ion and Hall Thrusters 439 Table 9-7. ETS-8 Kaufman thruster performance parameters. Parameter Active grid diameter (cm) Thruster input power (W) Nominal Isp (s) Thrust (mN) Total efficiency (%) Mass utilization efficiency (%) Electrical efficiency (%) Beam voltage (V) Beam current (A) NS-Station Keeping 12 541–611 2402–2665 20.9–23.2 45.6–49.7 66.2–73.5 78.2–79.5 996 0.43–0.48 Ion Thruster Figure 9-8. Photograph of the ETS-8 Kaufman ion thruster (from [23]). producing up to 200-mN thrust for European communications satellite station keeping applications. In Japan, the Institute of Space and Astronautical Science is developing a 20-cm-diameter, 30-mN-class microwave ion thruster [28]. In Germany, Astrium is developing a 200-mN-class rf ion thruster (RIT-22) for station keeping applications [29]. Finally, ring-cusp and rf ion thrusters are being miniaturized for applications that require thrust levels of the order of 1 mN or less. The 3-cm Miniature Xenon Ion thruster (MiXI) [30] uses a DC discharge, ring-cusp geometry with closely spaced ion optics to produce up toPDF Image | Fundamentals of Electric Propulsion: Ion and Hall Thrusters
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