Enhancement and suppression of velocity-shear-driven drift instability due to negative ions

R. Ichiki, K. Hayashi, T. Kaneko, R. Hatakeyama

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


The collisionless electron drift wave instability in a plasma involving sheared magnetic-field-aligned positive-ion flow and negative ion species has been experimentally investigated. Surveying wide ranges of the shear strength and of the negative ion exchange fraction, which was first made possible by our new apparatus mounted in a Q machine, reveals detailed characteristics of the instability. The kinetic dispersion relation suggests that the wave observed for positive shear is the current-driven shearmodified drift wave. However, for negative shear the wave exhibits peculiar behavior which cannot be directly interpreted by the linear local theory. We also found that negative ions tend to stabilize the instability.

Original languageEnglish
Pages (from-to)241-243
Number of pages3
JournalFusion Science and Technology
Issue number2 T.
Publication statusPublished - 2007 Feb

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering
  • Materials Science(all)
  • Mechanical Engineering


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