During some discharges in Tokamak Chauffage Alfvén Brésilien [R. M. O. Galvão 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.
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April 2009
Research Article|
April 16 2009
Bicoherence in electrostatic turbulence driven by high magnetohydrodynamic activity in Tokamak Chauffage Alfvén Brésilien Available to Purchase
G. Z. dos Santos Lima;
G. Z. dos Santos Lima
1Instituto de Física,
Universidade de São Paulo
, Caixa Postal 66316, 05315-970 São Paulo, Brazil
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Z. O. Guimarães-Filho;
Z. O. Guimarães-Filho
1Instituto de Física,
Universidade de São Paulo
, Caixa Postal 66316, 05315-970 São Paulo, Brazil
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A. M. Batista;
A. M. Batista
2Departamento de Matemática e Estatística,
Universidade Estadual de Ponta Grossa
, 84032-900 Ponta Grossa, Paraná, Brazil
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I. L. Caldas;
I. L. Caldas
1Instituto de Física,
Universidade de São Paulo
, Caixa Postal 66316, 05315-970 São Paulo, Brazil
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S. R. Lopes;
S. R. Lopes
3Departamento de Física,
Universidade Federal do Paraná
, Caixa Postal 19044, 81531-990 Curitiba, Paraná, Brazil
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R. L. Viana;
R. L. Viana
a)
3Departamento de Física,
Universidade Federal do Paraná
, Caixa Postal 19044, 81531-990 Curitiba, Paraná, Brazil
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I. C. Nascimento;
I. C. Nascimento
1Instituto de Física,
Universidade de São Paulo
, Caixa Postal 66316, 05315-970 São Paulo, Brazil
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Yu. K. Kuznetsov
Yu. K. Kuznetsov
1Instituto de Física,
Universidade de São Paulo
, Caixa Postal 66316, 05315-970 São Paulo, Brazil
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G. Z. dos Santos Lima
1
Z. O. Guimarães-Filho
1
A. M. Batista
2
I. L. Caldas
1
S. R. Lopes
3
R. L. Viana
3,a)
I. C. Nascimento
1
Yu. K. Kuznetsov
1
1Instituto de Física,
Universidade de São Paulo
, Caixa Postal 66316, 05315-970 São Paulo, Brazil
2Departamento de Matemática e Estatística,
Universidade Estadual de Ponta Grossa
, 84032-900 Ponta Grossa, Paraná, Brazil
3Departamento de Física,
Universidade Federal do Paraná
, Caixa Postal 19044, 81531-990 Curitiba, Paraná, Brazil
a)
Author to whom correspondence should be addressed. Electronic mail: [email protected].
Phys. Plasmas 16, 042508 (2009)
Article history
Received:
November 25 2008
Accepted:
February 25 2009
Citation
G. Z. dos Santos Lima, Z. O. Guimarães-Filho, A. M. Batista, I. L. Caldas, S. R. Lopes, R. L. Viana, I. C. Nascimento, Yu. K. Kuznetsov; Bicoherence in electrostatic turbulence driven by high magnetohydrodynamic activity in Tokamak Chauffage Alfvén Brésilien. Phys. Plasmas 1 April 2009; 16 (4): 042508. https://doi.org/10.1063/1.3099701
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