Critically balanced ion temperature gradient turbulence in fusion plasmas

Details Critically balanced ion temperature gradient turbulence in fusion plasmas Critically balanced ion temperature gradient turbulence in fusion plasmas

2011-04-22

arxiv.org/abs/1104.4514v2

Physical Review Letters 107, 115003 (2011)

Physics

Plasma Physics

4 pages, 5 figures

Scientific paper

Scaling laws for ion temperature gradient driven turbulence in magnetized toroidal plasmas are derived and compared with direct numerical simulations. Predicted dependences of turbulence fluctuation amplitudes, spatial scales, and resulting heat fluxes on temperature gradient and magnetic field line pitch are found to agree with numerical results in both the driving and inertial ranges. Evidence is provided to support the critical balance conjecture that parallel streaming and nonlinear perpendicular decorrelation times are comparable at all spatial scales, leading to a scaling relationship between parallel and perpendicular spatial scales. This indicates that even strongly magnetized plasma turbulence is intrinsically three-dimensional.

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