Determining plasma-fueling sources with an end-loss ion spectrometer

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To help identify the major sources of fueling gas in Tandem Mirror Experiment-Upgrade (TMX-U), we mounted a mass-sensitive, E parallel to B, end-loss ion spectrometer (ELIS) near the machine's centerline. We set the electric field in the ELIS to simultaneously measure the axial loss currents of both hydrogen and deuterium. We then initiated plasma discharges, where we injected either hydrogen or deuterium gas into the central cell. We also selected and deselected the central-cell neutral beams that were fueled with hydrogen gas. The end-cell neutral beams were always selected and fueled with deuterium. By taking the ratio of the hydrogen ... continued below

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Pages: 14

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Grubb, D.P. & Foote, J.H. March 4, 1986.

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Description

To help identify the major sources of fueling gas in Tandem Mirror Experiment-Upgrade (TMX-U), we mounted a mass-sensitive, E parallel to B, end-loss ion spectrometer (ELIS) near the machine's centerline. We set the electric field in the ELIS to simultaneously measure the axial loss currents of both hydrogen and deuterium. We then initiated plasma discharges, where we injected either hydrogen or deuterium gas into the central cell. We also selected and deselected the central-cell neutral beams that were fueled with hydrogen gas. The end-cell neutral beams were always selected and fueled with deuterium. By taking the ratio of the hydrogen end-loss current to the deuterium end-loss current (with a known deuterium-gas feed rate), we were able to infer the effective fueling rates that were due to wall reflux, central-cell beams, and end-cell beams. The results were the following: wall reflux, 6 Torr.l/s; central-cell beams, 15 Torr.l/s; and end-cell beams 1 Torr.l/s. 3 refs., 3 figs., 1 tab.

Physical Description

Pages: 14

Notes

NTIS, PC A02/MF A01.

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  • 6. topical conference on high temperature plasma diagnostics, Hilton Head Island, SC, USA, 9 Mar 1986

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  • Other: DE86008026
  • Report No.: UCRL-93834
  • Report No.: CONF-860324-2
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 5920982
  • Archival Resource Key: ark:/67531/metadc1095995

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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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  • March 4, 1986

Added to The UNT Digital Library

  • Feb. 18, 2018, 3:59 p.m.

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  • April 26, 2018, 2:22 p.m.

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Grubb, D.P. & Foote, J.H. Determining plasma-fueling sources with an end-loss ion spectrometer, article, March 4, 1986; [Livermore,] California. (digital.library.unt.edu/ark:/67531/metadc1095995/: accessed May 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.