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26 Apr 1999

Volume 74, Issue 17, pp. 2405-2555

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High voltage sheath behavior in a drifting plasma

I. G. Brown, O. R. Monteiro, and M. M. M. Bilek

Appl. Phys. Lett. 74, 2426 (1999); http://dx.doi.org/10.1063/1.123869 (3 pages) | Cited 14 times

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We describe a simple experiment in which a high voltage substrate is immersed in a streaming, vacuum-arc-produced, titanium plasma. We show that high substrate voltages that are orders of magnitude greater than the electron temperature can be sustained, effectively on a direct current basis, by a well-rounded substrate (no sharp points or edges) immersed in the plasma stream, for the case of a plasma with density not too low (greater than about 109 cm−3) and with drift velocity that is equal to or greater than the sheath propagation speed, typically of order the ion acoustic speed. This result is significant not only from a basic plasma physics perspective, but also for the technology of carrying out plasma immersion surface processing. © 1999 American Institute of Physics.
Show PACS
52.40.Hf Plasma-material interactions; boundary layer effects
52.25.Fi Transport properties
52.80.Mg Arcs; sparks; lightning; atmospheric electricity
52.80.Vp Discharge in vacuum
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