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Title: Magnetized sheath near positively biased wall between two permanent magnetic plates

Abstract

The characteristics of magnetized electron sheath near a positively biased conducting wall parallel to magnetic field formed between two permanent magnetic plates were experimentally investigated in a double plasma device. The magnetic field strength between the magnetic plates is about 1200 G which is sufficient to magnetize the plasma such that the ion gyroradius is comparable to the electron Debye length. A virtual cathode (or potential dip) structure was found between the electron-rich sheath and bulk plasma. For a given neutral gas pressure, the potential minimum (dip position) remains almost the same for different positive biases on the wall. For a given bias on the wall, however, the electron sheath thickness and the potential drop from the bulk plasma to the dip decrease with the increase of the neutral gas pressure. In addition, the electron sheath and potential dip appear to be wider and deeper in the downstream side of the wall.

Authors:
; ; ; ;  [1];  [2]
  1. Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026 (China)
  2. (China)
Publication Date:
OSTI Identifier:
22490950
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 6; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; CATHODES; DEBYE LENGTH; ELECTRONS; MAGNETIC FIELDS; PERMANENT MAGNETS; PLASMA; PLASMA SHEATH; PLATES; WALLS

Citation Formats

Sun, Yan, Wei, Zi-an, Ma, J. X., E-mail: jxma@ustc.edu.cn, Jiang, Zheng-qi, Wu, Fei, and CAS Key Laboratory of Geospace Environment, University of Science and Technology of China, Hefei, Anhui 230026. Magnetized sheath near positively biased wall between two permanent magnetic plates. United States: N. p., 2015. Web. doi:10.1063/1.4922756.
Sun, Yan, Wei, Zi-an, Ma, J. X., E-mail: jxma@ustc.edu.cn, Jiang, Zheng-qi, Wu, Fei, & CAS Key Laboratory of Geospace Environment, University of Science and Technology of China, Hefei, Anhui 230026. Magnetized sheath near positively biased wall between two permanent magnetic plates. United States. doi:10.1063/1.4922756.
Sun, Yan, Wei, Zi-an, Ma, J. X., E-mail: jxma@ustc.edu.cn, Jiang, Zheng-qi, Wu, Fei, and CAS Key Laboratory of Geospace Environment, University of Science and Technology of China, Hefei, Anhui 230026. Mon . "Magnetized sheath near positively biased wall between two permanent magnetic plates". United States. doi:10.1063/1.4922756.
@article{osti_22490950,
title = {Magnetized sheath near positively biased wall between two permanent magnetic plates},
author = {Sun, Yan and Wei, Zi-an and Ma, J. X., E-mail: jxma@ustc.edu.cn and Jiang, Zheng-qi and Wu, Fei and CAS Key Laboratory of Geospace Environment, University of Science and Technology of China, Hefei, Anhui 230026},
abstractNote = {The characteristics of magnetized electron sheath near a positively biased conducting wall parallel to magnetic field formed between two permanent magnetic plates were experimentally investigated in a double plasma device. The magnetic field strength between the magnetic plates is about 1200 G which is sufficient to magnetize the plasma such that the ion gyroradius is comparable to the electron Debye length. A virtual cathode (or potential dip) structure was found between the electron-rich sheath and bulk plasma. For a given neutral gas pressure, the potential minimum (dip position) remains almost the same for different positive biases on the wall. For a given bias on the wall, however, the electron sheath thickness and the potential drop from the bulk plasma to the dip decrease with the increase of the neutral gas pressure. In addition, the electron sheath and potential dip appear to be wider and deeper in the downstream side of the wall.},
doi = {10.1063/1.4922756},
journal = {Physics of Plasmas},
number = 6,
volume = 22,
place = {United States},
year = {Mon Jun 15 00:00:00 EDT 2015},
month = {Mon Jun 15 00:00:00 EDT 2015}
}