Tangential neutral-beam-driven instabilities in the princeton beta experiment

  • W. W. Heidbrink
  • , K. Bol
  • , D. Buchenauer
  • , R. Fonck
  • , G. Gammel
  • , K. Ida
  • , R. Kaita
  • , S. Kaye
  • , H. Kugel
  • , B. LeBlanc
  • , W. Morris
  • , M. Okabayashi
  • , E. Powell
  • , S. Sesnic
  • , H. Takahashi

Research output: Contribution to journalArticlepeer-review

Abstract

During tangential neutral-beam injection into the PBX tokamak, bursts of two types of instabilities are observed. One instability occurs in the frequency range 120-210 kHz and the other oscillates predominantly near the frequency of bulk plasma rotation (20-30 kHz). Both instabilities correlate with drops in neutron emission and bursts in charge-exchange neutral flux, indicating that beam ions are removed from the center of the plasma by the instabilities. The central losses are comparable to the losses induced by the fishbone instability during perpendicular injection.

Original languageEnglish (US)
Pages (from-to)835-838
Number of pages4
JournalPhysical review letters
Volume57
Issue number7
DOIs
StatePublished - 1986

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy

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