Secondary Electron Emission from Dielectric Materials of a Hall Thruster with Segmented Electrodes

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Description

The discharge parameters in Hall thrusters depend strongly on the yield of secondary electron emission from channel walls. Comparative measurements of the yield of secondary electron emission at low energies of primary electrons were performed for several dielectric materials used in Hall thrusters with segmented electrodes. The measurements showed that at low energies of primary electrons the actual energetic dependencies of the total yield of secondary electron emission could differ from fits, which are usually used in theoretical models. The observed differences might be caused by electron backscattering, which is dominant at lower energies and depends strongly on surface properties. ... continued below

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784 Kilobytes pages

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Dunaevsky, A.; Raitses, Y. & Fisch, N.J. February 12, 2003.

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Description

The discharge parameters in Hall thrusters depend strongly on the yield of secondary electron emission from channel walls. Comparative measurements of the yield of secondary electron emission at low energies of primary electrons were performed for several dielectric materials used in Hall thrusters with segmented electrodes. The measurements showed that at low energies of primary electrons the actual energetic dependencies of the total yield of secondary electron emission could differ from fits, which are usually used in theoretical models. The observed differences might be caused by electron backscattering, which is dominant at lower energies and depends strongly on surface properties. Fits based on power or linear laws are relevant at higher energies of primary electrons, where the bulk material properties play a decisive role.

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784 Kilobytes pages

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INIS; OSTI as DE00812024

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  • Other Information: PBD: 12 Feb 2003

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  • Report No.: PPPL-3787
  • Grant Number: AC02-76CH03073
  • DOI: 10.2172/812024 | External Link
  • Office of Scientific & Technical Information Report Number: 812024
  • Archival Resource Key: ark:/67531/metadc738486

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  • February 12, 2003

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  • Oct. 18, 2015, 6:40 p.m.

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  • April 18, 2016, 1:04 p.m.

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Dunaevsky, A.; Raitses, Y. & Fisch, N.J. Secondary Electron Emission from Dielectric Materials of a Hall Thruster with Segmented Electrodes, report, February 12, 2003; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc738486/: accessed December 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.