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Title: Plasma density perturbation caused by probes at low gas pressure

Abstract

An analysis of plasma parameter perturbations caused by a spherical probe immersed into a spherical plasma is presented in this paper for arbitrary collisionality and arbitrary ratios of probe to plasma dimensions. The plasma was modeled by the fluid plasma equations with ion inertia and nonlinear ion friction force that dominate plasma transport at low gas pressures. Significant depletion of the plasma density around the probe surface has been found. The area of plasma depletion coincides with the sensing area of different kinds of magnetic and microwave probes and will therefore lead to errors in data inferred from measurements with such probes.

Authors:
 [1]; ORCiD logo [2]
  1. Clark Univ., Worcester, MA (United States). Dept. of Mathematics and Computer Science
  2. RF Plasma Consulting and Univ. of Michigan, Brookline, MA (United States(
Publication Date:
Research Org.:
Univ. of Michigan, Ann Arbor, MI (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1535319
Grant/Contract Number:  
SC0001939
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 24; Journal Issue: 9; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
physics

Citation Formats

Sternberg, Natalia, and Godyak, Valery. Plasma density perturbation caused by probes at low gas pressure. United States: N. p., 2017. Web. doi:10.1063/1.4990397.
Sternberg, Natalia, & Godyak, Valery. Plasma density perturbation caused by probes at low gas pressure. United States. doi:10.1063/1.4990397.
Sternberg, Natalia, and Godyak, Valery. Fri . "Plasma density perturbation caused by probes at low gas pressure". United States. doi:10.1063/1.4990397. https://www.osti.gov/servlets/purl/1535319.
@article{osti_1535319,
title = {Plasma density perturbation caused by probes at low gas pressure},
author = {Sternberg, Natalia and Godyak, Valery},
abstractNote = {An analysis of plasma parameter perturbations caused by a spherical probe immersed into a spherical plasma is presented in this paper for arbitrary collisionality and arbitrary ratios of probe to plasma dimensions. The plasma was modeled by the fluid plasma equations with ion inertia and nonlinear ion friction force that dominate plasma transport at low gas pressures. Significant depletion of the plasma density around the probe surface has been found. The area of plasma depletion coincides with the sensing area of different kinds of magnetic and microwave probes and will therefore lead to errors in data inferred from measurements with such probes.},
doi = {10.1063/1.4990397},
journal = {Physics of Plasmas},
number = 9,
volume = 24,
place = {United States},
year = {2017},
month = {8}
}

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