Abstract
The behavior of turbulent fluxes in the vicinity of a resonant point m/n=q(x res) in a plane wall plasma layer in a tokamak is studied by numerically analyzing the nonlinear MHD equations in a four-field electromagnetic model. Simulations show that, as the electron temperature at the plasma edge increases, the intensity of turbulent particle flux decreases, reaching its minimum value, and then increases. Such behavior is found to be due to the stabilizing effect of the electron drift velocity (V y0∼dT e0/dx) in the equation for the longitudinal component of the magnetic potential. It is shown that, at a strong toroidal magnetic field, turbulent transport processes conform to the gyro-Bohm scaling, which gradually passes over to the Bohm scaling as the field decreases.
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References
B. D. Scott, Plasma Phys. Controlled Fusion 39, 1635 (1997).
R. V. Shurygin, Fiz. Plazmy 27, 19 (2001) [Plasma Phys. Rep. 27, 18 (2001)].
A. Zeiler, J. F. Drake, and B. Rogers, Phys. Plasmas 4, 2134 (1997).
X. N. Su, P. N. Yushmanov, J. Q. Dong, and W. Horton, Phys. Plasmas 1, 1905 (1994).
B. D. Scott, J. F. Drake, and A. B. Hassam, Phys. Rev. Lett. 54, 1027 (1985).
T. M. Antonsen, Phys. Rev. Lett. 41, 33 (1978).
H. Biglari, P. H. Diamond, and P. W. Terry, Phys. Fluids B 2, 1 (1990).
Y. Z. Zhang and S. M. Mahajian, Phys. Fluids 4, 1385 (1992).
S. J. Camargo, D. Biskamp, and B. D. Scott, Phys. Plasmas 2, 48 (1995).
R. V. Shurygin, in Proceedings of the 29th EPS Conference on Plasma Physics and Controlled Fusion, Montreux, 2002, p. 1.108.
M. Ottaviani and G. Manfredi, Phys. Plasmas 6, 3267 (1999).
P. W. Terry, Rev. Mod. Phys. 72, 109 (2000).
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Translated from Fizika Plazmy, Vol. 30, No. 5, 2004, pp. 387–397.
Original Russian Text Copyright ¢ 2004 by Shurygin.
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Shurygin, R.V. Drift-Alfvén turbulence in a tokamak wall plasma. Plasma Phys. Rep. 30, 353–362 (2004). https://doi.org/10.1134/1.1744944
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DOI: https://doi.org/10.1134/1.1744944