Pedestal and edge turbulence characteristics from an XGC1 gyrokinetic simulation
作者： S. Ku , R.M. Churchill , C.S. Chang
关键词:
摘要: Understanding the multi-scale neoclassical and turbulence physics in edge region (pedestal + scrape-off layer) is required order to reliably predict performance future fusion devices. We explore turbulent characteristics from a multiscale XGC1 gyrokinetic simulation DIII-D like tokamak geometry, here excluding neutrals collisions. For an H-mode type plasma with steep pedestal, it found that electron density fluctuations increase towards separatrix, stay high well into SOL, reaching maximum value of $\delta n_e / \bar{n}_e \sim 0.18$. Blobs are observed, born around magnetic separatrix surface propagate radially outward velocities generally less than 1 km/s. Strong poloidal motion blobs also present, near 20 km/s, consistent $E \times B$ rotation. The show negative skewness closed field line pedestal regions, presence "holes", followed by transition strong positive across SOL. These simulations indicate not only phenomena, but turbulence, including blob-generation mechanism, can remain important Qualitative comparisons will be made experimental observations.
arxiv.org
sci-hub.st 参考文章(44)
J. Dominski, S. Brunner, T. Görler, F. Jenko, D. Told, L. Villard, How non-adiabatic passing electron layers of linear microinstabilities affect turbulent transport Physics of Plasmas. ,vol. 22, pp. 062303- ,(2015) , 10.1063/1.4922659
Bruce D Scott, Tokamak edge turbulence: background theory and computation Plasma Physics and Controlled Fusion. ,vol. 49, ,(2007) , 10.1088/0741-3335/49/7/S02
F. Jenko, W. Dorland, M. Kotschenreuther, B. N. Rogers, Electron temperature gradient driven turbulence Physics of Plasmas. ,vol. 7, pp. 1904- 1910 ,(2000) , 10.1063/1.874014
Ch. P. Ritz, Roger D. Bengtson, S. J. Levinson, E. J. Powers, Turbulent structure in the edge plasma of the TEXT tokamak Physics of Fluids. ,vol. 27, pp. 2956- 2959 ,(1984) , 10.1063/1.864611
C. S. Chang, Seunghoe Kue, H. Weitzner, X-transport: A baseline nonambipolar transport in a diverted tokamak plasma edge Physics of Plasmas. ,vol. 9, pp. 3884- 3892 ,(2002) , 10.1063/1.1490348
D. A. D’Ippolito, J. R. Myra, S. J. Zweben, Convective transport by intermittent blob-filaments: Comparison of theory and experiment Physics of Plasmas. ,vol. 18, pp. 060501- ,(2011) , 10.1063/1.3594609
E.J. Doyle (Chair Transport Physics), W.A. Houlberg (Chair Confinement Da Modelling), Y. Kamada (Chair Pedestal and Edge), V. Mukhovatov (co-Chair Transport Physics), T.H. Osborne (co-Chair Pedestal and Edge), A. Polevoi (co-Chair Confinement Da Modelling), G Bateman, J.W Connor, J.G. Cordey (retired), T Fujita, X Garbet, T.S Hahm, L.D Horton, A.E Hubbard, F Imbeaux, F Jenko, J.E Kinsey, Y Kishimoto, J Li, T.C Luce, Y Martin, M Ossipenko, V Parail, A Peeters, T.L Rhodes, J.E Rice, C.M Roach, V Rozhansky, F Ryter, G Saibene, R Sartori, A.C.C Sips, J.A Snipes, M Sugihara, E.J Synakowski, H Takenaga, T Takizuka, K Thomsen, M.R Wade, H.R Wilson, ITPA Transport Physics Topical Group, ITPA Confinement Database and Model Group, ITPA Pedestal and Edge Topical Group, Chapter 2: Plasma confinement and transport Nuclear Fusion. ,vol. 47, ,(2007) , 10.1088/0029-5515/47/6/S02
T. S. Hahm, K. H. Burrell, Flow shear induced fluctuation suppression in finite aspect ratio shaped tokamak plasma Physics of Plasmas. ,vol. 2, pp. 1648- 1651 ,(1995) , 10.1063/1.871313
C. S. Chang, Seunghoe Ku, H. Weitzner, Numerical study of neoclassical plasma pedestal in a tokamak geometry Physics of Plasmas. ,vol. 11, pp. 2649- 2667 ,(2004) , 10.1063/1.1707024
J.R. Myra, W.M. Davis, D.A. D'Ippolito, B. LaBombard, D.A. Russell, J.L. Terry, S.J. Zweben, Edge sheared flows and the dynamics of blob-filaments Nuclear Fusion. ,vol. 53, pp. 073013- ,(2013) , 10.1088/0029-5515/53/7/073013