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

Title: Langmuir Probe Measurements in Plasma Shadows

Abstract

When immersing a target into a plasma streaming along magnetic field lines, a distinct shadow region extending over large distances is observed by the naked eye downstream of the target.In this work we present an experimental study of the effect applying Langmuir probes. In contrast to expectations, there are only marginal changes in the profiles of temperature and density behind masks that cut away about 50% of the plasma cross-section. On the other hand, the mean density is drastically reduced by an order of magnitude. First attempts to simulate the observations by solving the classical 2D diffusion equation were not successful.

Authors:
 [1]; ;  [1];  [2]
  1. Max-Planck-Institut fuer Plasmaphysik, TI Greifswald, Wendelsteinstr. 1, 17491 Greifswald, EURATOM Association (Germany)
  2. (Germany)
Publication Date:
OSTI Identifier:
20797955
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 812; Journal Issue: 1; Conference: PLASMA 2005: International conference on research and applications of plasmas; 3. German-Polish conference on plasma diagnostics for fusion and applications; 5. French-Polish seminar on thermal plasma in space and laboratory, Opole-Turawa (Poland), 6-9 Sep 2005; Other Information: DOI: 10.1063/1.2168881; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; DIFFUSION EQUATIONS; DISTANCE; ELECTRON TEMPERATURE; ION TEMPERATURE; LANGMUIR PROBE; MAGNETIC FIELDS; PLASMA; PLASMA DENSITY; PLASMA DIAGNOSTICS; RADIATION TRANSPORT

Citation Formats

Waldmann, O., Koch, B., Fussmann, G., and Humboldt-Universitaet zu Berlin, Institut fuer Physik, PLA, Newtonstr. 15, 12489 Berlin. Langmuir Probe Measurements in Plasma Shadows. United States: N. p., 2006. Web. doi:10.1063/1.2168881.
Waldmann, O., Koch, B., Fussmann, G., & Humboldt-Universitaet zu Berlin, Institut fuer Physik, PLA, Newtonstr. 15, 12489 Berlin. Langmuir Probe Measurements in Plasma Shadows. United States. doi:10.1063/1.2168881.
Waldmann, O., Koch, B., Fussmann, G., and Humboldt-Universitaet zu Berlin, Institut fuer Physik, PLA, Newtonstr. 15, 12489 Berlin. Sun . "Langmuir Probe Measurements in Plasma Shadows". United States. doi:10.1063/1.2168881.
@article{osti_20797955,
title = {Langmuir Probe Measurements in Plasma Shadows},
author = {Waldmann, O. and Koch, B. and Fussmann, G. and Humboldt-Universitaet zu Berlin, Institut fuer Physik, PLA, Newtonstr. 15, 12489 Berlin},
abstractNote = {When immersing a target into a plasma streaming along magnetic field lines, a distinct shadow region extending over large distances is observed by the naked eye downstream of the target.In this work we present an experimental study of the effect applying Langmuir probes. In contrast to expectations, there are only marginal changes in the profiles of temperature and density behind masks that cut away about 50% of the plasma cross-section. On the other hand, the mean density is drastically reduced by an order of magnitude. First attempts to simulate the observations by solving the classical 2D diffusion equation were not successful.},
doi = {10.1063/1.2168881},
journal = {AIP Conference Proceedings},
number = 1,
volume = 812,
place = {United States},
year = {Sun Jan 15 00:00:00 EST 2006},
month = {Sun Jan 15 00:00:00 EST 2006}
}