Bicoherence in electrostatic turbulence driven by high magnetohydrodynamic activity in Tokamak Chauffage Alfven Bresilien

Journal Article · Wed Apr 15 00:00:00 EDT 2009 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.3099701· OSTI ID:21277006

Guimaraes-Filho, Z O; Caldas, I L; Nascimento, I C; Kuznetsov, Yu K ^[1]; Batista, A M ^[2]; Lopes, S R; Viana, R L ^[3]

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1. Instituto de Fisica, Universidade de Sao Paulo, Caixa Postal 66316, 05315-970 Sao Paulo (Brazil)
2. Departamento de Matematica e Estatistica, Universidade Estadual de Ponta Grossa, 84032-900 Ponta Grossa, Parana (Brazil)
3. Departamento de Fisica, Universidade Federal do Parana, Caixa Postal 19044, 81531-990 Curitiba, Parana (Brazil)

During some discharges in Tokamak Chauffage Alfven Bresilien [R. M. O. Galvao et al., Plasma Phys. Controlled Fusion 43, 1181 (2001)] high magnetohydrodynamic activity may appear with a peaked frequency spectrum. Whenever this peak occurs, the ambient broadband electrostatic turbulence is remarkably modified, synchronizing into the dominant magnetic fluctuation frequency and presenting high bicoherence in the whole plasma edge with a maximum bicoherence inside the plasma. A phenomenological model is introduced to investigate this driven turbulence bicoherence, consisting of nonlinearly coupled phase-randomized drift modes with time-periodic external driving at the dominant magnetic fluctuation frequency. The bicoherence spectrum of this model can mimic features of the experimental results.

• OSTI ID: 21277006
• Journal Information: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 4 Vol. 16; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
DRIFT INSTABILITY
ELECTRIC DISCHARGES
FLUCTUATIONS
MAGNETOHYDRODYNAMICS
PLASMA
TOKAMAK DEVICES
TURBULENCE