Plasma diagnostic tools for optimizing negative hydrogen ion sources

DOI PDF 被引用文献7件
  • U. Fantz
    Max-Planck-Institut fuer Plasmaphysik , EURATOM Association, Boltzmannstrasse 2, 85748 Garching, Germany
  • H. D. Falter
    Max-Planck-Institut fuer Plasmaphysik , EURATOM Association, Boltzmannstrasse 2, 85748 Garching, Germany
  • P. Franzen
    Max-Planck-Institut fuer Plasmaphysik , EURATOM Association, Boltzmannstrasse 2, 85748 Garching, Germany
  • E. Speth
    Max-Planck-Institut fuer Plasmaphysik , EURATOM Association, Boltzmannstrasse 2, 85748 Garching, Germany
  • R. Hemsworth
    CEA-Cadarache , EURATOM Association, F-13108 St. Paul-lez-Durance, France
  • D. Boilson
    Association EURATOM-DCU , PRL/NCST, Glasnevin, Dublin 13, Ireland
  • A. Krylov
    RRC Kurchatov Institute , 1 Kurchatov Square, Moscow 123182, Russia

抄録

<jats:p>The powerful diagnostic tool of optical emission spectroscopy is used to measure the plasma parameters in negative hydrogen ion sources based on the surface mechanism. Results for electron temperature, electron density, atomic-to-molecular hydrogen density ratio, and gas temperature are presented for two types of sources, a rf source and an arc source, which are currently under development for a neutral beam heating system of ITER. The amount of cesium in the plasma volume is obtained from cesium radiation: the Cs neutral density is five to ten orders of magnitude lower than the hydrogen density and the Cs ion density is two to three orders of magnitude lower than the electron density in front of the grid. It is shown that monitoring of cesium lines is very useful for monitoring the cesium balance in the source. From a line-ratio method negative ion densities are determined. In a well-conditioned source the negative ion density is of the same order of magnitude as the electron density and correlates with extracted current densities.</jats:p>

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