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Electrostatic particle-in-cell simulation of heat flux mitigation using magnetic fields

Part of: Solved and Unsolved problems in Plasma Physics

Published online by Cambridge University Press:  26 September 2016

Karl Felix Lüskow ,
S. Kemnitz ,
G. Bandelow ,
J. Duras ,
D. Kahnfeld ,
P. Matthias ,
R. Schneider  and
D. Konigorski
Karl Felix Lüskow*
Affiliation:
Institute for Physics, Ernst-Moritz-Arndt University of Greifswald, Felix-Hausdorff-Str. 6, D-17489 Greifswald, Germany
S. Kemnitz
Affiliation:
Institute for Physics, Ernst-Moritz-Arndt University of Greifswald, Felix-Hausdorff-Str. 6, D-17489 Greifswald, Germany Institute of Computer Science, University of Rostock, Albert-Einstein-Str. 22, D-18059 Rostock, Germany
G. Bandelow
Affiliation:
Institute for Physics, Ernst-Moritz-Arndt University of Greifswald, Felix-Hausdorff-Str. 6, D-17489 Greifswald, Germany
J. Duras
Affiliation:
Institute for Physics, Ernst-Moritz-Arndt University of Greifswald, Felix-Hausdorff-Str. 6, D-17489 Greifswald, Germany Department of Applied Mathematics, Physics and Humanities, Nürnberger Institute of Technology, Keßlerplatz 12, D-90489 Nürnberg, Germany
D. Kahnfeld
Affiliation:
Institute for Physics, Ernst-Moritz-Arndt University of Greifswald, Felix-Hausdorff-Str. 6, D-17489 Greifswald, Germany
P. Matthias
Affiliation:
Institute for Physics, Ernst-Moritz-Arndt University of Greifswald, Felix-Hausdorff-Str. 6, D-17489 Greifswald, Germany
R. Schneider
Affiliation:
Institute for Physics, Ernst-Moritz-Arndt University of Greifswald, Felix-Hausdorff-Str. 6, D-17489 Greifswald, Germany
D. Konigorski
Affiliation:
Airbus Operations GmbH, Emerging Technologies and Concepts, Kreetslag 10, D-21129 Hamburg, Germany
*
†Email address for correspondence: lueskow@physik.uni-greifswald.de
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Abstract

The particle-in-cell (PIC) method was used to simulate heat flux mitigation experiments with partially ionised argon. The experiments demonstrate the possibility of reducing heat flux towards a target using magnetic fields. Modelling using the PIC method is able to reproduce the heat flux mitigation qualitatively. This is driven by modified electron transport. Electrons are magnetised and react directly to the external magnetic field. In addition, an increase of radial turbulent transport is also needed to explain the experimental observations in the model. Close to the target an increase of electron density is created. Due to quasi-neutrality, ions follow the electrons. Charge exchange collisions couple the dynamics of the neutrals to the ions and reduce the flow velocity of neutrals by radial momentum transport and subsequent losses. By this, the dominant heat-transport channel by neutrals gets reduced and a reduction of the heat deposition, similar to the experiment, is observed. Using the simulation a diagnostic module for optical emission is developed and its results are compared with spectroscopic measurements and photos from the experiment. The results of this study are in good agreement with the experiment. Experimental observations such as a shrank bright emission region close to the nozzle exit, an additional emission in front of the target and an overall change in colour to red are reproduced by the simulation.

Keywords

magnetized plasmasplasma dynamicsplasma simulation
Type
Research Article
Information
Journal of Plasma Physics , Volume 82 , Issue 5 , October 2016 , 595820502
Copyright
© Cambridge University Press 2016 

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