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Updated: Jun 19, 2026

Magnetically Induced Rotating Rayleigh-Taylor Instability
Published on: March 3, 2017
Interplay between gyrokinetic turbulence, flows, and collisions: perspectives on transport and poloidal rotation
G Dif-Pradalier1, V Grandgirard, Y Sarazin
1Association Euratom-CEA, CEA/IRFM, F-13108 St. Paul-lez-Durance cedex, France.
Abstract:
The impact of ion-ion collisions on confinement is investigated with the full-f and global gyrokinetic Gysela code through a series of nonlinear turbulence simulations for tokamak parameters. A twofold scan in the turbulence drive and in collisionality is performed, highlighting (i) a heat transport expressed in terms of critical quantities-threshold and exponent, (ii) a first evidence of turbulent generation of poloidal momentum, and (iii) the dominance of mean flow shear, mediated through the turbulent corrugation of the mean profiles, with regard to the oft-invoked zonal flow shear.
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