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Effect of energetic electrons on near-wall sheath voltage in the cathode region of a cold cathode direct current discharge

Phys. Plasmas 16, 104501 (2009); doi:10.1063/1.3257914

Published 28 October 2009

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J. Blessington,1 S. F. Adams,2 V. I. Demidov,3,1 and J. M. Williamson4
1Department of Physics, West Virginia University, Morgantown, West Virginia 26506, USA
2Air Force Research Laboratory, Wright-Patterson AFB, Ohio 45433, USA
3UES, Inc., 4401 Dayton-Xenia Road, Beavercreek, Ohio 45432, USA
4Innovative Scientific Solutions, Inc., 2766 Indian Ripple Road, Ohio 45440-3638, USA
It is experimentally demonstrated that energetic electrons originating from the cathode or produced in volumetric processes in the cathode region of a cold cathode direct current discharge can create a large potential drop in the near-wall sheath. This voltage drop may be much greater than kTe/e (where k is the Boltzmann constant, Te is the electron temperature, and e is the electron charge). Due to the large near-wall sheath voltage, slow and moderately energetic electrons cannot reach the wall and move toward the anode. Application of additional potentials to the wall can change the amount of energetic electrons reaching the wall. This effect can be used for regulation of the near-cathode plasma and near-wall sheath properties and thus may be useful in technical applications. ©2009 American Institute of Physics
History: Received 31 July 2009; accepted 13 October 2009; published 28 October 2009
Permalink: http://link.aip.org/link/?PHPAEN/16/104501/1
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1070-664X (print)   1089-7674 (online)
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