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Dust remobilization from rough planar surfaces in tokamak steady-state plasmas
The ability of tungsten (W) dust to be remobilized from rough tokamak plasma-facing surfaces is investigated in this study. Atomic Force Microscopy is used to evaluate the adhesion force distribution between W spheroids of ∼1−10 µm radius and a rough W substrate. Our results confirm that the Rabinovich model describes reasonably well the mean adhesion force in tokamak-relevant surface roughness regimes. The external (electric and ion drag) forces are estimated as well using a simplified sheath model. The results reveal that micron-size dust can be resuspended by attainable electric fields in tokamak conditions.
Dust remobilization from rough planar surfaces in tokamak steady-state plasmas
The ability of tungsten (W) dust to be remobilized from rough tokamak plasma-facing surfaces is investigated in this study. Atomic Force Microscopy is used to evaluate the adhesion force distribution between W spheroids of ∼1−10 µm radius and a rough W substrate. Our results confirm that the Rabinovich model describes reasonably well the mean adhesion force in tokamak-relevant surface roughness regimes. The external (electric and ion drag) forces are estimated as well using a simplified sheath model. The results reveal that micron-size dust can be resuspended by attainable electric fields in tokamak conditions.
Dust remobilization from rough planar surfaces in tokamak steady-state plasmas
A. Autricque (author) / S. Peillon (author) / F. Gensdarmes (author) / M. Sow (author) / N. Fedorczak (author) / H. Roche (author) / O. Pluchery (author) / C. Grisolia (author)
2018
Article (Journal)
Electronic Resource
Unknown
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