Abstract
The effect of variations in the key parameter of short-wavelength turbulence—the ion-acoustic Larmor radius ρ s , which determines the position of the maximum of the drift instability growth rate over poloidal wavenumbers—was studied experimentally at the FT-2 tokamak. For this purpose, helium was injected to hydrogen plasma, which resulted in a change in the electron temperature at the plasma edge. The universality of the exponential shape of the turbulence spectra over radial wavenumbers q and a substantial excess of the characteristic turbulence scale L over the ion-acoustic Larmor radius was confirmed with the help of correlative diagnostics of enhanced scattering. This excess at the discharge periphery reaches a value of 3–5 at a low electron temperature, apparently, due to an increase in the dissipation of drift waves upon their cascade transfer toward short scale-lengths.
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Original Russian Text © A.D. Gurchenko, E.Z. Gusakov, S.I. Lashkul, A.B. Altukhov, E.P. Selyunin, L.A. Esipov, M.Yu. Kantor, D.V. Kouprienko, A.Yu. Stepanov, 2013, published in Fizika Plazmy, 2013, Vol. 39, No. 5, pp. 395–403.
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Gurchenko, A.D., Gusakov, E.Z., Lashkul, S.I. et al. Time evolution of the exponential wavenumber spectra of turbulence upon helium injection into a hydrogen discharge at the FT-2 tokamak. Plasma Phys. Rep. 39, 337–344 (2013). https://doi.org/10.1134/S1063780X13050061
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DOI: https://doi.org/10.1134/S1063780X13050061