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<p>Hollow cathodes are widely used as electron sources in electric propulsion systems owing to their high electron generation efficiency. Research findings allude to the significant impact of the temperature and plasma characteristics of the emitter region of a hollow cathode, which supplies thermionic electrons, on its operation. However, these characteristics are not yet fully understood. The objective of this study is to investigate these characteristics under different orifice diameters and operating conditions. The emitter temperature increased with the discharge current for both orifice diameters. The electron density was higher downstream for larger orifice diameters. The emitter temperature was compared with the orifice temperature and was found to be lower than the latter for smaller orifices.</p>

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Measurement of LaB6 hollow cathode emitter region temperature and plasma characteristics

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年3月7日

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  • Yuya Oshio,
  • Shogo Masuyama,
  • Hiroki Watanabe,
  • Ikkoh Funaki

摘要

Hollow cathodes are widely used as electron sources in electric propulsion systems owing to their high electron generation efficiency. Research findings allude to the significant impact of the temperature and plasma characteristics of the emitter region of a hollow cathode, which supplies thermionic electrons, on its operation. However, these characteristics are not yet fully understood. The objective of this study is to investigate these characteristics under different orifice diameters and operating conditions. The emitter temperature increased with the discharge current for both orifice diameters. The electron density was higher downstream for larger orifice diameters. The emitter temperature was compared with the orifice temperature and was found to be lower than the latter for smaller orifices.