H/sup -/ production in a multicusp microwave plasma

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An experiment was undertaken to examine H/sup -/ production by volume processes in a multicusp microwave discharge, part of the cusp field being enhanced to produce an ECR (electron cyclotron resonance), that would also isolate the hotter plasma formed there. This arrangement is analogous to the ''magnetic filters'' used in some other negative ion sources. This work describes the experiment set up and the results obtained, which are a survey of the behavior of this type of device. Also included is a discussion of the volume processes associated with H/sup -/ production including numerical estimates, based on the experimental measurements, ... continued below

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Pages: 220

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Trow, J.R. March 1, 1985.

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Description

An experiment was undertaken to examine H/sup -/ production by volume processes in a multicusp microwave discharge, part of the cusp field being enhanced to produce an ECR (electron cyclotron resonance), that would also isolate the hotter plasma formed there. This arrangement is analogous to the ''magnetic filters'' used in some other negative ion sources. This work describes the experiment set up and the results obtained, which are a survey of the behavior of this type of device. Also included is a discussion of the volume processes associated with H/sup -/ production including numerical estimates, based on the experimental measurements, which indicate H/sup -/ production is by dissociative attachment of cold electrons to vibrationally excited hydrogen molecules, and loss is by mutual neutralization with positive ions. The experimental observations are consistent with this model. These are also the same mechanisms used in the models of Bacal and Hiskes. Since magnetic fields generated by samarium cobalt permanent magnets were an important part of this experiment a set of field calculations was undertaken and is included.

Physical Description

Pages: 220

Notes

NTIS, PC A10/MF A01.

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  • Other Information: Thesis

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  • Other: DE85011983
  • Report No.: LBL-19136
  • Grant Number: AC03-76SF00098
  • DOI: 10.2172/5638985 | External Link
  • Office of Scientific & Technical Information Report Number: 5638985
  • Archival Resource Key: ark:/67531/metadc1092367

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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Creation Date

  • March 1, 1985

Added to The UNT Digital Library

  • Feb. 10, 2018, 10:06 p.m.

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  • April 24, 2018, 7:16 p.m.

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Trow, J.R. H/sup -/ production in a multicusp microwave plasma, report, March 1, 1985; [Berkeley,] California. (digital.library.unt.edu/ark:/67531/metadc1092367/: accessed October 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.