Investigation of Electron Current Oscillations in the Plasma of a 5 kW-Class Hall Thruster Running on Xenon and Krypton
Résumé
This contribution presents the examination of electron current time-series acquired in the plasma of the 5 kW-class PPS ® Dual Hall thruster fired with xenon and krypton. The thruster was fired with xenon and krypton as propellant over a broad range of discharge voltages [250-600 V] and input powers [2.5-6 kW] in the PIVOINE-2G vacuum chamber. Time-resolved electron current measurements have been performed in the far-field plume with a cylindrical Langmuir probe polarized above the plasma potential to capture the whole electron population. A high-sensitivity calibrated current probe was used to directly measure the electron current with a 100 MHz sampling rate. Analysis of the electron current time-series and associated discharge current traces has been carried out with various tools: the Fourier transform, the wavelet transform and the Huang-Hilbert transform. The study reveals the impact of the applied voltage, the power and the propellant on different oscillation modes, namely the breathing mode, the ion transit-time mode and the high-frequency modes. It also shows similarities and discrepancies between the electron current dynamics and the discharge current dynamics. Finally, correlations between the various modes are explored.
Domaines
Plasmas
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SciTech AIAA 2025-0065 Investigation-of-electron-current-oscillations-in-a-5-kw-HT NoFormat.pdf (86)
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