Improved production of N{sup +} ions from a multicusp ion beam apparatus

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Description

This invention is comprised of a method of generating a high purity (at least 98%) N{sup +} ion beam using a multicusp ion source having a chamber formed by a cylindrical chamber wall surrounded by a plurality of magnets, a filament centrally disposed in said chamber, a plasma electrode having an extraction orifice at one end of the chamber, a magnetic filter having two parallel magnets spaced from said plasma electrode and dividing the chamber into arc discharge and extraction regions. The method includes ionizing nitrogen gas in the arc discharge region of the chamber, maintaining the chamber wall at ... continued below

Physical Description

19 p.

Creation Information

Leung, Ka-Ngo; Kunkel, W.B. & Walther, S.R. December 31, 1991.

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This patent 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. More information about this patent can be viewed below.

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Description

This invention is comprised of a method of generating a high purity (at least 98%) N{sup +} ion beam using a multicusp ion source having a chamber formed by a cylindrical chamber wall surrounded by a plurality of magnets, a filament centrally disposed in said chamber, a plasma electrode having an extraction orifice at one end of the chamber, a magnetic filter having two parallel magnets spaced from said plasma electrode and dividing the chamber into arc discharge and extraction regions. The method includes ionizing nitrogen gas in the arc discharge region of the chamber, maintaining the chamber wall at a positive voltage relative to the filament and at a magnitude for an optimum percentage of N{sup +} ions in the extracted ion beam, disposing a hot liner within the chamber and near the chamber wall to limit recombination of N{sup +} ions into the N{sub 2}{sup +} ions, spacing the magnets of the magnetic filter from each other for optimum percentage of N{sup +} ions in the extracted ion beams, and maintaining a relatively low pressure downstream of the extraction orifice and of a magnitude (preferably within the range of 3--8 {times} 10{sup {minus}4} torr) for an optimum percentage of N{sup +} ions in the extracted ion beam.

Physical Description

19 p.

Notes

OSTI as DE94003044

Source

  • Other Information: PBD: 1991

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  • Other: DE94003044
  • Report No.: PATENTS-US--A7774912
  • Grant Number: AC03-76SF00098
  • Office of Scientific & Technical Information Report Number: 140151
  • Archival Resource Key: ark:/67531/metadc625930

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Office of Scientific & Technical Information Technical Reports

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Creation Date

  • December 31, 1991

Added to The UNT Digital Library

  • June 16, 2015, 7:43 a.m.

Description Last Updated

  • April 5, 2016, 10:06 a.m.

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Leung, Ka-Ngo; Kunkel, W.B. & Walther, S.R. Improved production of N{sup +} ions from a multicusp ion beam apparatus, patent, December 31, 1991; California. (digital.library.unt.edu/ark:/67531/metadc625930/: accessed August 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.