Effects of Enhanced Eathode Electron Emission on Hall Thruster Operation

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Interesting discharge phenomena are observed that have to do with the interaction between the magnetized Hall thruster plasma and the neutralizing cathode. The steadystate parameters of a highly ionized thruster discharge are strongly influenced by the electron supply from the cathode. The enhancement of the cathode electron emission above its self-sustained level affects the discharge current and leads to a dramatic reduction of the plasma divergence and a suppression of large amplitude, low frequency discharge current oscillations usually related to an ionization instability. These effects correlate strongly with the reduction of the voltage drop in the region with the fringing ... continued below

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171 Kb

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Y. Raitses, A. Smirnov and N. J. Fisch April 24, 2009.

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Interesting discharge phenomena are observed that have to do with the interaction between the magnetized Hall thruster plasma and the neutralizing cathode. The steadystate parameters of a highly ionized thruster discharge are strongly influenced by the electron supply from the cathode. The enhancement of the cathode electron emission above its self-sustained level affects the discharge current and leads to a dramatic reduction of the plasma divergence and a suppression of large amplitude, low frequency discharge current oscillations usually related to an ionization instability. These effects correlate strongly with the reduction of the voltage drop in the region with the fringing magnetic field between the thruster channel and the cathode. The measured changes of the plasma properties suggest that the electron emission affects the electron cross-field transport in the thruster discharge. These trends are generalized for Hall thrusters of various configurations.

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171 Kb

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  • Report No.: PPPL-4405
  • Grant Number: DE=-ACO2-09CH11466
  • DOI: 10.2172/953211 | External Link
  • Office of Scientific & Technical Information Report Number: 953211
  • Archival Resource Key: ark:/67531/metadc930154

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Office of Scientific & Technical Information Technical Reports

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  • April 24, 2009

Added to The UNT Digital Library

  • Nov. 13, 2016, 7:26 p.m.

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  • Dec. 12, 2016, 8:52 p.m.

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Y. Raitses, A. Smirnov and N. J. Fisch. Effects of Enhanced Eathode Electron Emission on Hall Thruster Operation, report, April 24, 2009; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc930154/: accessed October 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.