Sheath over a rough surface in a tilted magnetic field
- Lawrence Livermore National Laboratory, Livermore, California94550 (United States)
In this paper a sheath near the wall whose surface is {open_quotes}rough,{close_quotes} containing random bumps with a height comparable to the distance between them is considered. The magnetic field is assumed to form a shallow angle with the wall (as in a tokamak divertor) and the scale of nonuniformities is assumed greater than the ion gyroradius. The following new effects caused by surface roughness are identified: (1) The fraction of the surface {open_quotes}wetted{close_quotes} by the plasma becomes much smaller than for a flat wall. (2) The ion subsheath is broadened and the diamagnetic current in it acquires a complex three-dimensional structure. (3) Cross-field nonuniformities of the plasma potential appear in the bulk plasma. {copyright} {ital 1998 American Institute of Physics.}
- OSTI ID:
- 624854
- Journal Information:
- Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 6 Vol. 5; ISSN 1070-664X; ISSN PHPAEN
- Country of Publication:
- United States
- Language:
- English
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