Dif-Pradalier G, Grandgirard V, Sarazin Y, Garbet X, Ghendrih Ph
Association Euratom-CEA, CEA/IRFM, F-13108 St. Paul-lez-Durance cedex, France.
Phys Rev Lett. 2009 Aug 7;103(6):065002. doi: 10.1103/PhysRevLett.103.065002. Epub 2009 Aug 4.
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.
通过使用全f和全局回旋动理学Gysela程序，针对托卡马克参数进行了一系列非线性湍流模拟，研究了离子-离子碰撞对约束的影响。在湍流驱动和碰撞率方面进行了双重扫描，突出了：(i) 以临界量——阈值和指数表示的热输运；(ii) 极向动量湍流产生的首个证据；(iii) 相对于经常提及的带状流剪切，通过平均轮廓的湍流波纹介导的平均流剪切的主导地位。
