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Electrostatic turbulence driven by high magnetohydrodynamic activity in Tokamak Chauffage Alfven Bresilien

Authors
Journal
Physics of Plasmas
1070-664X
Publisher
American Institute of Physics
Publication Date
Keywords
  • Plasma Edge Turbulence
  • Drift-Wave Turbulence
  • Scrape-Off Layer
  • Magnetic Perturbations
  • Phase Synchronization
  • Ergodic Divertor
  • Resonant Fields
  • Castor Tokamak
  • Tcabr Tokamak
  • Tore-Supra
  • Physics
  • Fluids & Plasmas

Abstract

In Tokamak Chauffage Alfven Bresilien [R. M. O. Galvao , Plasma Phys. Controlled Fusion 43, 1181 (2001)], high magnetohydrodynamic (MHD) activity may appear spontaneously or during discharges with a voltage biased electrode inserted at the plasma edge. The turbulent electrostatic fluctuations, measured by Langmuir probes, are modulated by Mirnov oscillations presenting a dominant peak with a common frequency around 10 kHz. We report the occurrence of phase locking of the turbulent potential fluctuations driven by MHD activity at this frequency. Using wavelet cross-spectral analysis, we characterized the phase and frequency synchronization in the plasma edge region. We introduced an order parameter to characterize the radial dependence of the phase-locking intensity. (c) 2008 American Institute of Physics.

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