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430 Chapter 9 for the 13-cm XIPS thruster are shown in Table 9-1. The thrusters produce nominally 18 mN of thrust at an Isp of 2500 s and a total efficiency of about 50%. A schematic of the 13-cm XIPS thruster is shown in Fig. 9-1, and a photograph of the thruster, which is manufactured by L-3 Communications, Electron Technologies, Inc., is shown in Fig. 9-2. Over 60 of these thrusters were launched into orbit and successfully used for North-South station keeping on Hughes and Boeing satellites. The next ion thruster to fly was NASA’s NSTAR ion engine [5,6], which is a ring-cusp, DC electron-bombardment discharge thruster with an active grid Table 9-1. 13-cm XIPS performance. Parameter Active grid diameter (cm) Thruster input power (W) Average Isp (s) Thrust (mN) Total efficiency (%) Mass utilization efficiency (%) Electrical efficiency (%) Beam voltage (V) Beam current (A) Station Keeping 13 421 2507 17.2 50.0 77.7 71.3 750 0.4 Neutralizer Subassembly Electrode Apertures (~11,000) Mask Ion-Extraction Electrodes (3) Permanent Magnets Propellant Electrical Isolator Propellant Plenum Permanent Magnets Electrical Insulator Ground Screen Cathode/Keeper Subassembly Magnertic Return Path Fig. 9-1. Schematic of the 13-cm XIPS thruster (from [4,10]).PDF Image | Fundamentals of Electric Propulsion: Ion and Hall Thrusters
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