Electrostatic Probe with Shielded Probe Insulator Tube for Low Disturbing Plasma Measurements in Hall Thrusters

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Electrostatic probes are widely used to measure spatial plasma parameters of the quasi-neutral plasma in Hall thrusters and similar ExB electric discharge devices. Significant perturbations of the plasma, induced by such probes, can mask the actual physics involved in operation of these devices. In Hall thrusters, probe-induced perturbations can produce changes in the discharge current and plasma parameters on the order of their steady state values. These perturbations are explored by varying the material, penetration distance, and residence time of various probe designs. A possible cause of these perturbations appears to be the secondary electron emission, induced by energetic plasma ... continued below

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D. Staack, Y. Raitses, and N.J. Fisch July 10, 2003.

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Description

Electrostatic probes are widely used to measure spatial plasma parameters of the quasi-neutral plasma in Hall thrusters and similar ExB electric discharge devices. Significant perturbations of the plasma, induced by such probes, can mask the actual physics involved in operation of these devices. In Hall thrusters, probe-induced perturbations can produce changes in the discharge current and plasma parameters on the order of their steady state values. These perturbations are explored by varying the material, penetration distance, and residence time of various probe designs. A possible cause of these perturbations appears to be the secondary electron emission, induced by energetic plasma electrons, from insulator ceramic tubes in which the probe wire is inserted. A new probe in which a low secondary electron emission material, such as metal, shields the probe ceramic tube, is shown to function without producing such large perturbations. A segmentation of this shield further prevents probe -induced perturbations, by not shortening the plasma through the conductive shield. In a set of experiments with a segmented shield probe, the thruster was operated in the input power range of 500-2.5 kW and discharge voltages of 200-500 V, while the probe-induced perturbations of the discharge current were below 4% of its steady state value in the region in which 90% of the voltage drop takes place.

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1.1 MB pages

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INIS; OSTI as DE00814705

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  • Other Information: PBD: 10 Jul 2003

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  • Report No.: PPPL-3838
  • Grant Number: AC02-76CH03073
  • DOI: 10.2172/814705 | External Link
  • Office of Scientific & Technical Information Report Number: 814705
  • Archival Resource Key: ark:/67531/metadc734237

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • July 10, 2003

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  • Oct. 18, 2015, 6:40 p.m.

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  • April 15, 2016, 9:59 p.m.

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D. Staack, Y. Raitses, and N.J. Fisch. Electrostatic Probe with Shielded Probe Insulator Tube for Low Disturbing Plasma Measurements in Hall Thrusters, report, July 10, 2003; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc734237/: accessed November 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.