Reducing Plasma Perturbations with Segmented Metal Shielding on Electrostatic Probes

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Description

Electrostatic probes are widely used to measure spatial plasma parameters in the quasi-neutral plasma created in Hall thrusters and similar E x B electric discharge devices. Significant perturbations of the plasma, induced by such probes, can mask the actual physics involved in operation of these devices. In an attempt to reduce these perturbations in Hall thrusters, the perturbations were examined by varying the component material, penetration distance, and residence time of various probe designs. This study leads us to a conclusion that secondary electron emission from insulator ceramic tubes of the probe can affect local changes of the plasma parameters ... continued below

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1019 Kilobytes pages

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Staack, D.; Raitses, Y. & N.J., Fisch October 2, 2002.

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Description

Electrostatic probes are widely used to measure spatial plasma parameters in the quasi-neutral plasma created in Hall thrusters and similar E x B electric discharge devices. Significant perturbations of the plasma, induced by such probes, can mask the actual physics involved in operation of these devices. In an attempt to reduce these perturbations in Hall thrusters, the perturbations were examined by varying the component material, penetration distance, and residence time of various probe designs. This study leads us to a conclusion that secondary electron emission from insulator ceramic tubes of the probe can affect local changes of the plasma parameters causing plasma perturbations. A probe design, which consists of a segmented metal shielding of the probe insulator, is suggested to reduce these perturbations. This new probe design can be useful for plasma applications in which the electron temperature is sufficient to produce secondary electron emission by interaction of plasma electrons with dielectric materials.

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1019 Kilobytes pages

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INIS; OSTI as DE00809844

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  • Other Information: PBD: 2 Oct 2002

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  • Report No.: PPPL-3752
  • Grant Number: AC02-76CH03073
  • DOI: 10.2172/809844 | External Link
  • Office of Scientific & Technical Information Report Number: 809844
  • Archival Resource Key: ark:/67531/metadc739173

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  • October 2, 2002

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  • Oct. 18, 2015, 6:40 p.m.

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  • April 15, 2016, 9:52 p.m.

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Staack, D.; Raitses, Y. & N.J., Fisch. Reducing Plasma Perturbations with Segmented Metal Shielding on Electrostatic Probes, report, October 2, 2002; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc739173/: accessed September 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.