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Title: Reducing Plasma Perturbations with Segmented Metal Shielding on Electrostatic Probes

Abstract

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.

Authors:
; ;
Publication Date:
Research Org.:
Princeton Plasma Physics Lab., NJ (US)
Sponsoring Org.:
USDOE Office of Science (US)
OSTI Identifier:
809844
Report Number(s):
PPPL-3752
TRN: US0302628
DOE Contract Number:  
AC02-76CH03073
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 2 Oct 2002
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; CERAMICS; DESIGN; DIELECTRIC MATERIALS; ELECTRIC DISCHARGES; ELECTRON EMISSION; ELECTRON TEMPERATURE; ELECTRONS; ELECTROSTATIC PROBES; PHYSICS; PLASMA; PROBES; SHIELDING; THRUSTERS; GAS DISCHARGES; PLASMA-WALL INTERACTION; PROBES (ELECTRIC, MAGNETIC)

Citation Formats

Staack, D., Raitses, Y., and Fisch N.J. Reducing Plasma Perturbations with Segmented Metal Shielding on Electrostatic Probes. United States: N. p., 2002. Web. doi:10.2172/809844.
Staack, D., Raitses, Y., & Fisch N.J. Reducing Plasma Perturbations with Segmented Metal Shielding on Electrostatic Probes. United States. doi:10.2172/809844.
Staack, D., Raitses, Y., and Fisch N.J. Wed . "Reducing Plasma Perturbations with Segmented Metal Shielding on Electrostatic Probes". United States. doi:10.2172/809844. https://www.osti.gov/servlets/purl/809844.
@article{osti_809844,
title = {Reducing Plasma Perturbations with Segmented Metal Shielding on Electrostatic Probes},
author = {Staack, D. and Raitses, Y. and Fisch N.J.},
abstractNote = {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.},
doi = {10.2172/809844},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2002},
month = {10}
}