skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Cross-field electron transport induced by a rotating spoke in a cylindrical Hall thruster

Abstract

Rotating spoke phenomena have been observed in a variety of Hall thruster and other E x B devices. It has been suggested that the spoke may be associated with the enhancement of the electron cross-field transport. In this paper, the current conducted across the magnetic field via a rotating spoke has been directly measured for the first time in the E x B discharge of a cylindrical Hall thruster. The spoke current was measured using a segmented anode. Synchronized measurements with a high speed camera and a four-segment anode allow observation of the current as a function of time and azimuthal position. Upwards of 50% of the total current is conducted through the spoke, which occupies a quarter of the Hall thruster channel area. To determine the transport mechanism, emissive and Langmuir probes were installed to measure fluctuating plasma potential, electron density, and temperature. A perturbed, azimuthal electric field and density are observed to oscillate in-phase with the rotating spoke. The resulting drift current is found to enhance electron transport with a magnitude equal to the spoke current to within margins of error.

Authors:
; ;  [1]
  1. Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543 (United States)
Publication Date:
OSTI Identifier:
22043611
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 19; Journal Issue: 1; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1070-664X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; CYLINDRICAL CONFIGURATION; DENSITY; ELECTRIC CURRENTS; ELECTRIC DISCHARGES; ELECTRIC FIELDS; ELECTRON DENSITY; ELECTRON TEMPERATURE; FLUCTUATIONS; ION TEMPERATURE; LANGMUIR PROBE; MAGNETIC FIELDS; MAGNETOHYDRODYNAMICS; PLASMA; PLASMA DENSITY; PLASMA POTENTIAL; PLASMA WAVES; THRUSTERS; TIME DEPENDENCE

Citation Formats

Ellison, C L, Raitses, Y, and Fisch, N J. Cross-field electron transport induced by a rotating spoke in a cylindrical Hall thruster. United States: N. p., 2012. Web. doi:10.1063/1.3671920.
Ellison, C L, Raitses, Y, & Fisch, N J. Cross-field electron transport induced by a rotating spoke in a cylindrical Hall thruster. United States. doi:10.1063/1.3671920.
Ellison, C L, Raitses, Y, and Fisch, N J. Sun . "Cross-field electron transport induced by a rotating spoke in a cylindrical Hall thruster". United States. doi:10.1063/1.3671920.
@article{osti_22043611,
title = {Cross-field electron transport induced by a rotating spoke in a cylindrical Hall thruster},
author = {Ellison, C L and Raitses, Y and Fisch, N J},
abstractNote = {Rotating spoke phenomena have been observed in a variety of Hall thruster and other E x B devices. It has been suggested that the spoke may be associated with the enhancement of the electron cross-field transport. In this paper, the current conducted across the magnetic field via a rotating spoke has been directly measured for the first time in the E x B discharge of a cylindrical Hall thruster. The spoke current was measured using a segmented anode. Synchronized measurements with a high speed camera and a four-segment anode allow observation of the current as a function of time and azimuthal position. Upwards of 50% of the total current is conducted through the spoke, which occupies a quarter of the Hall thruster channel area. To determine the transport mechanism, emissive and Langmuir probes were installed to measure fluctuating plasma potential, electron density, and temperature. A perturbed, azimuthal electric field and density are observed to oscillate in-phase with the rotating spoke. The resulting drift current is found to enhance electron transport with a magnitude equal to the spoke current to within margins of error.},
doi = {10.1063/1.3671920},
journal = {Physics of Plasmas},
issn = {1070-664X},
number = 1,
volume = 19,
place = {United States},
year = {2012},
month = {1}
}