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378 Chapter 7 [53] predictions for the total current, electron current, and ion current at the thruster exit for the SPT-100 are shown in Fig. 7-19. In this case, a frequency of 16 kHz is predicted, in good agreement with the experimental data. Similar predictions about the low-frequency oscillation behavior of Hall thrusters from the 2-D HPHall code are shown in Fig. 7-20, where the anode current and beam current are plotted versus time. The predicted frequency in this case is 11 kHz, which is less than the value shown in the example of Fig. 7-18. This is likely due to an under-prediction of the electron temperature in the ionization region of the channel [30] by this version of the code. 15 10 5 0 0.0 0.1 0.2 17 kHz 8 7 6 5 4 3 2 1 0 0.3 0.4 0.5 Fig. 7-18. Measured evolution of the discharge current for the SPT-100 (from [55]). Time (ms) Total Electron Ion 0 100 200 Time (μs) Fig. 7-19. Oscillating current predictions from the 1-D code for the SPT-100 (from [53]). Current (A) Discharge Current (A)PDF Image | Fundamentals of Electric Propulsion: Ion and Hall Thrusters
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