Electrostatic drift wave eigenmodes in tokamaks

C. Z. Cheng, K. T. Tsang

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)


The eigenmode equation governing both the toroidicity-induced and the ion-temperature- gradient-driven modes of arbitrary wavelengths in tokamaks is derived by employing the ballooning-mode formalism. For the toroidicity-induced mode (electron driftwave), the ion magnetic drift resonances are de-stabilizing and can have a significant effect when the temperature ratio, Te/Ti, is of order unity. The ion-temperature-gradient-driven mode (ion drift wave), which is unstable in a sheared slab geometry, is found to be further de-stabilized by the ion magnetic drifts, resulting in a lower critical ion temperature gradient (Ƞi).

Original languageEnglish
Pages (from-to)643-650
Number of pages8
JournalNuclear Fusion
Issue number6
Publication statusPublished - 1981 Jun

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics


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