Physics of intrinsic rotation in flux-driven ITG turbulence

Ku, S.; Abiteboul, J.; Diamond, P. H.; Dif-Pradalier, G.; Kwon, J. M.; Sarazin, Y.; Hahm, T. S.; Garbet, X.; Chang, C. S.; Latu, G.; Yoon, E. S.; Ghendrih, Ph.; Yi, S.; Strugarek, A.; Solomon, W.; Grandgirard, V.

doi:10.1088/0029-5515/52/6/063013

Physics of intrinsic rotation in flux-driven ITG turbulence

Journal Article · Fri Apr 27 04:00:00 EDT 2012 · Nuclear Fusion

DOI:https://doi.org/10.1088/0029-5515/52/6/063013· OSTI ID:1564876

Ku, S.; Abiteboul, J.; Diamond, P. H.; Dif-Pradalier, G.; Kwon, J. M.; Sarazin, Y.; Hahm, T. S.; Garbet, X.; Chang, C. S.; Latu, G.; Yoon, E. S.; Ghendrih, Ph.; Yi, S.; Strugarek, A.; Solomon, W.; Grandgirard, V.

Global, heat flux-driven ITG gyrokinetic simulations which manifest the formation of macroscopic, mean toroidal flow profiles with peak thermal Mach number 0.05, are reported. Both a particle-in-cell (XGC1p) and a semi-Lagrangian (GYSELA) approach are utilized without a priori assumptions of scale separation between turbulence and mean fields. Flux-driven ITG simulations with different edge flow boundary conditions show in both approaches the development of net unidirectional intrinsic rotation in the co-current direction. Intrinsic torque is shown to scale approximately linearly with the inverse scale length of the ion temperature gradient. External momentum input is shown to effectively cancel the intrinsic rotation profile, thus confirming the existence of a local residual stress and intrinsic torque. Fluctuation intensity, intrinsic torque and mean flow are demonstrated to develop inwards from the boundary. The measured correlations between residual stress and two fluctuation spectrum symmetry breakers, namely E × B shear and intensity gradient, are similar. Avalanches of (positive) heat flux, which propagate either outwards or inwards, are correlated with avalanches of (negative) parallel momentum flux, so that outward transport of heat and inward transport of parallel momentum are correlated and mediated by avalanches. The probability distribution functions of the outward heat flux and the inward momentum flux show strong structural similarity.

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); New York Univ. (NYU), NY (United States); Univ. of California, Oakland, CA (United States); UT-Battelle LLC/ORNL, Oak Ridge, TN (Unted States); Univ. of California, San Diego, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

DOE Contract Number:: FC02-06ER54845; AC02-05CH11231; AC05-00OR22725; FC02-08ER54959

OSTI ID:: 1564876

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 6 Vol. 52; ISSN 0029-5515

Publisher:: IOP Science

Country of Publication:: United States

Language:: English

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