System size effects on gyrokinetic turbulence
McMillan, B. F., Lapillonne, X., Brunner, S., Villard, L., Jolliet, S., Bottino, A., Görler, T. and Jenko, F.. (2010) System size effects on gyrokinetic turbulence. Physical Review Letters, Vol.105 (No.15). Article no. 155001. ISSN 0031-9007Full text not available from this repository.
Official URL: http://dx.doi.org/10.1103/PhysRevLett.105.155001
The scaling of turbulence-driven heat transport with system size in magnetically confined plasmas is reexamined using first-principles based numerical simulations. Two very different numerical methods are applied to this problem, in order to resolve a long-standing quantitative disagreement, which may have arisen due to inconsistencies in the geometrical approximation. System size effects are further explored by modifying the width of the strong gradient region at fixed system size. The finite width of the strong gradient region in gyroradius units, rather than the finite overall system size, is found to induce the diffusivity reduction seen in global gyrokinetic simulations.
|Item Type:||Journal Article|
|Subjects:||Q Science > QC Physics|
|Divisions:||Faculty of Science > Physics|
|Journal or Publication Title:||Physical Review Letters|
|Publisher:||American Physical Society|
|Date:||4 October 2010|
|Page Range:||Article no. 155001|
|Access rights to Published version:||Restricted or Subscription Access|
|Funder:||Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung (SNF), Swiss National Supercomputing Centre-CSCS, EPFL BlueGene facility|
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