Fundamentals of Electric Propulsion: Ion and Hall Thrusters

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Fundamentals of Electric Propulsion: Ion and Hall Thrusters ( fundamentals-electric-propulsion-ion-and-hall-thrusters )

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278 Chapter 6 An interesting result of this analysis is that significant ionization occurs in the orifice, which provides electrons to the discharge. Figure 6-21 shows the electron current calculated as a function of the distance along the orifice axis. The electron current is about 50% higher exiting the orifice as compared with the amount extracted from the insert plasma. This is because the very high neutral gas density in the neutralizer cathode orifice region causes significant ionization. Discharge cathodes have much lower electron multiplication factors in the orifice because the neutral and plasma densities are typically an order of magnitude lower. 6 x 1022 3 x 1023 3x1023 5 2x1023 4 2x1023 3 1x1023 2 x 1022 x 1022 x 1022 x 1022 Neutral Density Plasma Density 5 x 1022 1 x 1022 00 0.02 0.00 0.02 0.04 0.06 0.08 0.10 0.12 0.14 Distance Along Orifice (cm) Fig. 6-20. Neutral and plasma densities calculated in the NSTAR neutralizer cathode orifice at the TH15 operation point. Fig. 6-21. Electron current as a function of distance along the axis in the NSTAR neutralizer cathode orifice at TH15. Neutral Density (m 3) Plasma Density (m 3)

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