Impurities, temperature, and density in a miniature electrostatic plasma and current source

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Description

We have spectroscopically investigated the Sterling Scientific miniature electrostatic plasma source-a plasma gun. This gun is a clean source of high density (10{sup 19} - 10{sup 20} m{sup -3}), low temperature (5 - 15 eV) plasma. A key result of our investigation is that molybdenum from the gun electrodes is largely trapped in the internal gun discharge; only a small amount escapes in the plasma flowing out of the gun. In addition, the gun plasma parameters actually improve (even lower impurity contamination and higher ion temperature) when up to 1 kA of electron current is extracted from the gun via ... continued below

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Medium: P; Size: 23 p.

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Den Hartog, D.J.; Craig, D.J.; Fiksel, G. & Sarff, J.S. October 1, 1996.

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Description

We have spectroscopically investigated the Sterling Scientific miniature electrostatic plasma source-a plasma gun. This gun is a clean source of high density (10{sup 19} - 10{sup 20} m{sup -3}), low temperature (5 - 15 eV) plasma. A key result of our investigation is that molybdenum from the gun electrodes is largely trapped in the internal gun discharge; only a small amount escapes in the plasma flowing out of the gun. In addition, the gun plasma parameters actually improve (even lower impurity contamination and higher ion temperature) when up to 1 kA of electron current is extracted from the gun via the application of an external bias. This improvement occurs because the internal gun anode no longer acts as the current return for the internal gun discharge. The gun plasma is a virtual plasma electrode capable of sourcing an electron emission current density of 1 kA/cm{sup 2}. The high emission current, small size (3 - 4 cm diameter), and low impurity generation make this gun attractive for a variety of fusion and plasma technology applications.

Physical Description

Medium: P; Size: 23 p.

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INIS; OSTI as DE97000611

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  • Other Information: PBD: Oct 1996

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  • Other: DE97000611
  • Report No.: DOE/ER/54345--284
  • Grant Number: FG02-96ER54345
  • DOI: 10.2172/399676 | External Link
  • Office of Scientific & Technical Information Report Number: 399676
  • Archival Resource Key: ark:/67531/metadc677249

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  • October 1, 1996

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  • July 25, 2015, 2:20 a.m.

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  • Feb. 1, 2016, 12:55 p.m.

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Den Hartog, D.J.; Craig, D.J.; Fiksel, G. & Sarff, J.S. Impurities, temperature, and density in a miniature electrostatic plasma and current source, report, October 1, 1996; United States. (digital.library.unt.edu/ark:/67531/metadc677249/: accessed September 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.