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<p>The following paper reports about a non-intrusive diagnostic system able to measure the frequency of azimuthal instabilities inside the discharge channel of Hall Effect Thrusters (HETs) up to several hundreds of kHz in a real-time fashion. The innovative optical assembly, formed by an optimized sensor array, can help to drastically reduce the amount of processed data and the size of the opto-electronic front-end. The performances of the diagnostic system have been tested successfully during several tests on a HET in different regimes, showing an accuracy and reliability comparable with the state-of-the-art video recording methods. In order to test the real-time fashion of the diagnostic, we have monitor the time-evolution of the azimuthal mode spectra during the startup transient of the thruster, highlighting a redistribution of the oscillation energy among the different mode to an asymptotic stationary regime. The high compactness of the developed sensor array opens new possibilities to perform simultaneously multi-channel or species-selective real-time measurements, while the reduced electronics and power consumption pave the way to miniaturized tools for on-flight diagnostics.</p>

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Real-time plasma diagnostic tool for the investigation of azimuthal rotating instabilities in Hall Effect thrusters

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年1月7日

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  • L. Masi,
  • M. Presi,
  • A. Matteo,
  • Y. Dancheva,
  • F. Scortecci,
  • G. Coduti,
  • A. Piragino,
  • V. Vial

摘要

The following paper reports about a non-intrusive diagnostic system able to measure the frequency of azimuthal instabilities inside the discharge channel of Hall Effect Thrusters (HETs) up to several hundreds of kHz in a real-time fashion. The innovative optical assembly, formed by an optimized sensor array, can help to drastically reduce the amount of processed data and the size of the opto-electronic front-end. The performances of the diagnostic system have been tested successfully during several tests on a HET in different regimes, showing an accuracy and reliability comparable with the state-of-the-art video recording methods. In order to test the real-time fashion of the diagnostic, we have monitor the time-evolution of the azimuthal mode spectra during the startup transient of the thruster, highlighting a redistribution of the oscillation energy among the different mode to an asymptotic stationary regime. The high compactness of the developed sensor array opens new possibilities to perform simultaneously multi-channel or species-selective real-time measurements, while the reduced electronics and power consumption pave the way to miniaturized tools for on-flight diagnostics.