Numerical model of the radio-frequency magnetic presheath including wall impurities

Here, we present a numerical fluid plasma model able to capture the enhanced sputtering yield from the Faraday Screen and the Plasma-Facing Components of an Ion Cyclotron Resonance Heating antenna in a fusion machine. The model is a one-dimensional phase-resolved representation of a rectified radio...

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Bibliographic Details
Published in:Physics of plasmas 2019-09, Vol.26 (9)
Main Authors: Elias, M., Curreli, D., Jenkins, T. G., Myra, J. R., Wright, J.
Format: Article
Language:English
Subjects:
Cyclotron resonance
Erosion rates
Fluxes
Fractal analysis
Impurities
Mathematical models
Numerical models
Plasma physics
Sheaths
Sputtering
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Summary:Here, we present a numerical fluid plasma model able to capture the enhanced sputtering yield from the Faraday Screen and the Plasma-Facing Components of an Ion Cyclotron Resonance Heating antenna in a fusion machine. The model is a one-dimensional phase-resolved representation of a rectified radio frequency sheath in a magnetic field at an angle with respect to the material surface; the momentum transport of both ions and impurities is computed in the model. The sputtering behavior of the impurities coming off from the wall is obtained from the plasma-material interaction code Fractal-Tridyn. This study analyzes a range of magnetic angles and wave frequencies to parametrically investigate their effect on the energy-angle distributions of the impacting ions and sputtered impurities. Finally, an estimate of the impurity fluxes and of the gross-erosion rate is provided and compared with experimental data available in the literature.
ISSN:1070-664X
1089-7674
DOI:10.1063/1.5109256