Interplay between Gyrokinetic Turbulence, Flows, and Collisions: Perspectives on Transport and Poloidal Rotation

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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Guilhem Dif-Pradalier, Virginie Grandgirard, Yanick Sarazin, Xavier Garbet, Philippe Ghendrih. Interplay between Gyrokinetic Turbulence, Flows, and Collisions: Perspectives on Transport and Poloidal Rotation. Physical Review Letters, American Physical Society, 2009, 103, pp.065002. ⟨10.1103/PhysRevLett.103.065002⟩. ⟨cea-01468365⟩

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