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152 Chapter 4 Neutralizer Gas Inlet With Isolator RF Coil Discharge Vessel Acceleration Grid Package Grid-Spacing Isolators Sunshade Fig. 4-31. rf ion thruster design showing the alumina body, exterior rf coil, accelerator grid assembly and neutralizer cathode. The antenna system is enclosed in a metal “plasma shield” to eliminate electron collection from the space plasma (from [50]). between the plasma and the wall. The power out of the plasma equals the power absorbed, which is given by P = I U++I*U*+(I +I +I ) TeV + +I (2T + ), (4.5-6) abs p s w b 2 a eV where the electron and ion energy loss terms are shown explicitly. Equating the input power to the output power, the discharge loss is then d = Pabs Ib (4.5-7) The ionization and excitation is now only due to the plasma electrons, so the first current fraction in Eq. (4.5-7), using Eq. (4.3-50) and assuming quasi- neutrality ( ni ne ), is Ip = 2no ive V , (4.5-8) Ib kTe AsTs M Ip I* I I T I = U + + U * + s + w + 1 e V + + a ( 2 T e V + ) . Ib Ib Ib Ib 2 IbPDF Image | Fundamentals of Electric Propulsion: Ion and Hall Thrusters
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