Predicting ion charge state distributions of vacuum arc plasmas

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Multiply charged ions are present in vacuum arc plasmas. The ions are produced at cathode spots, and their charge state distributions (CSDs) depend on the cathode material but only little on the arc current or other parameters as long as the current is relatively low and the anode is not actively involved in the plasma production. There are experimental data of ion CSDs available in the literature for 50 different cathode materials. The CSDs can be calculated based on the assumption that thermodynamic equilibrium is valid in the vicinity of the cathode spot, and the equilibrium CSDs `freeze` at a ... continued below

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8 p.

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Anders, A. & Schulke, T. April 1, 1996.

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This article is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 46 times . More information about this article can be viewed below.

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  • Anders, A. Lawrence Berkeley Lab., CA (United States)
  • Schulke, T. Fraunhofer-Einrichtung fuer Werkstoffphysik und Schichttechnologie (IWS), Dresden (Germany)

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Description

Multiply charged ions are present in vacuum arc plasmas. The ions are produced at cathode spots, and their charge state distributions (CSDs) depend on the cathode material but only little on the arc current or other parameters as long as the current is relatively low and the anode is not actively involved in the plasma production. There are experimental data of ion CSDs available in the literature for 50 different cathode materials. The CSDs can be calculated based on the assumption that thermodynamic equilibrium is valid in the vicinity of the cathode spot, and the equilibrium CSDs `freeze` at a certain distance from the cathode spot (transition to a non-equilibrium plasma). Plasma temperatures and densities at the `freezing points` have been calculated, and, based on the existence of characteristic groups of elements in the Periodic Table, predictions of CSDs can be made for metallic elements which have not yet been used as cathode materials.

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8 p.

Notes

OSTI as DE96013220

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  • 17. international symposium on discharges and electrical insulation in vacuum, Berkeley, CA (United States), 21-26 Jul 1996

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  • Other: DE96013220
  • Report No.: LBL--37921
  • Report No.: CONF-960723--5
  • Grant Number: AC03-76SF00098
  • Office of Scientific & Technical Information Report Number: 273727
  • Archival Resource Key: ark:/67531/metadc667304

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Office of Scientific & Technical Information Technical Reports

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  • April 1, 1996

Added to The UNT Digital Library

  • June 29, 2015, 9:42 p.m.

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  • April 5, 2016, 12:02 p.m.

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Anders, A. & Schulke, T. Predicting ion charge state distributions of vacuum arc plasmas, article, April 1, 1996; California. (digital.library.unt.edu/ark:/67531/metadc667304/: accessed September 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.