Plasma Physics Reports

, Volume 37, Issue 12, pp 1001–1005 | Cite as

Experimental study of toroidal Alfvén modes in the Globus-M spherical tokamak

  • Yu. V. Petrov
  • M. I. Patrov
  • V. K. Gusev
  • A. E. Ivanov
  • V. B. Minaev
  • N. V. Sakharov
  • S. Yu. Tolstyakov
  • G. S. Kurskiev
Tokamaks

Abstract

In the experiments carried out on the Globus-M tokamak in regimes with injection of 26-keV neutral beams with a power of 0.75–0.85 MW, two branches of instabilities excited by fast ions were observed in the early stage of a discharge: a low-frequency energetic particle mode (EPM) in the frequency range of 5–30 kHz and a high-frequency mode in the range of 50–200 kHz, identified as a toroidal Alfvén eigenmode (TAE). The TAE developed in the initial phase of the discharge at q(0) > 1 and terminated when sawtooth oscillations were excited at q(0) < 1. The spectrum and spatial localization of the mode agree with predictions of the linear theory. The modes observed in the Globus-M tokamak possess both properties common to other tokamaks and their own specific features.

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Copyright information

© Pleiades Publishing, Ltd. 2011

Authors and Affiliations

  • Yu. V. Petrov
    • 1
  • M. I. Patrov
    • 1
  • V. K. Gusev
    • 1
  • A. E. Ivanov
    • 1
  • V. B. Minaev
    • 1
  • N. V. Sakharov
    • 1
  • S. Yu. Tolstyakov
    • 1
  • G. S. Kurskiev
    • 1
  1. 1.Ioffe Physical Technical InstituteRussian Academy of SciencesSt. PetersburgRussia

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