H− enhancement process in a multicusp ion source operated with a barium insert structure

DOI PDF 2 Citations
  • K. N. Leung
    Lawrence Berkeley Laboratory, University of California, Berkeley, California 94720
  • C. F. A. van Os
    Lawrence Berkeley Laboratory, University of California, Berkeley, California 94720
  • W. B. Kunkel
    Lawrence Berkeley Laboratory, University of California, Berkeley, California 94720

Description

<jats:p>It has been demonstrated that the H− output current from a small multicusp source can be substantially enhanced if the hydrogen plasma is seeded with barium. Operating with a barium washer insert at the extraction aperture, it is found that the extractable H− current is increased by a factor of 3 if the insert bias potential is optimized. By use of a mixture of xenon and hydrogen gas, it is further demonstrated that the positive hydrogen ions are responsible for the observed H− enhancement.</jats:p>

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