3D simulations of turbulent mixing in a simplified slab-divertor geometry

被引：7
作者：
Walkden, N. R. [1 ]
Riva, F. [1 ]
Dudson, B. D. [2 ]
Ham, C. [1 ]
Militello, F. [1 ]
Moulton, D. [1 ]
Nicholas, T. [1 ,2 ]
Omotani, J. T. [1 ]
机构：
[1] Culham Sci Ctr, CCFE UKAEA, Abingdon OX14 3DB, Oxon, England
[2] Univ York, York Plasma Inst, York YO10 5DD, N Yorkshire, England
来源：
NUCLEAR MATERIALS AND ENERGY | 2019年 / 18卷
基金：
英国工程与自然科学研究理事会;
关键词：
TRANSPORT;
D O I：
10.1016/j.nme.2018.12.005
中图分类号：
TL [原子能技术]; O571 [原子核物理学];
学科分类号：
0827 ; 082701 ;
摘要：
Three-dimensional simulations of plasma turbulence have been run using the STORM module of BOUT + + in a simple slab geometry aimed at representing a single, isolated tokamak divertor leg. Turbulence is driven primarily by the Kelvin-Helmholtz mechanism due to the sheared ExB flow that forms around the separatrix due to strong radial gradients in the sheath potential which arise from strong radial gradients in the electron temperature. The turbulence forms a mixing layer around the separatrix which spreads heat and particles into the private-flux region. The resulting spread of the electron heat flux is within the experimental range measured on MAST. An effective thermal transport coefficient which is approximately 10% of the Bohm value is measured from the simulations. When a transport coefficient of this magnitude is used in a diffusive axisymmetric simulation, the time-averaged radial profiles share similar features to the full turbulence simulation.
引用
收藏
页码：111 / 117
页数：7
相关论文
共 37 条
  • [1] Modeling of large amplitude plasma blobs in three-dimensions
    Angus, Justin R.
    Umansky, Maxim V.
    [J]. PHYSICS OF PLASMAS, 2014, 21 (01)
  • [2] Braginskii S.I., 1965, Reviews of Plasma Physics, Vvol 1
  • [3] Convective transport by intermittent blob-filaments: Comparison of theory and experiment
    D'Ippolito, D. A.
    Myra, J. R.
    Zweben, S. J.
    [J]. PHYSICS OF PLASMAS, 2011, 18 (06)
  • [4] BOUT plus plus : Recent and current developments
    Dudson, B. D.
    Allen, A.
    Breyiannis, G.
    Brugger, E.
    Buchanan, J.
    Easy, L.
    Farley, S.
    Joseph, I.
    Kim, M.
    McGann, A. D.
    Omotani, J. T.
    Umansky, M. V.
    Walkden, N. R.
    Xia, T.
    Xu, X. Q.
    [J]. JOURNAL OF PLASMA PHYSICS, 2015, 81
  • [5] BOUT++: A framework for parallel plasma fluid simulations
    Dudson, B. D.
    Umansky, M. V.
    Xu, X. Q.
    Snyder, P. B.
    Wilson, H. R.
    [J]. COMPUTER PHYSICS COMMUNICATIONS, 2009, 180 (09) : 1467 - 1480
  • [6] Three dimensional simulations of plasma filaments in the scrape off layer: A comparison with models of reduced dimensionality
    Easy, L.
    Militello, F.
    Omotani, J.
    Dudson, B.
    Havlickova, E.
    Tamain, P.
    Naulin, V.
    Nielsen, A. H.
    [J]. PHYSICS OF PLASMAS, 2014, 21 (12)
  • [7] Scaling of the tokamak near the scrape-off layer H-mode power width and implications for ITER
    Eich, T.
    Leonard, A. W.
    Pitts, R. A.
    Fundamenski, W.
    Goldston, R. J.
    Gray, T. K.
    Herrmann, A.
    Kirk, A.
    Kallenbach, A.
    Kardaun, O.
    Kukushkin, A. S.
    LaBombard, B.
    Maingi, R.
    Makowski, M. A.
    Scarabosio, A.
    Sieglin, B.
    Terry, J.
    Thornton, A.
    [J]. NUCLEAR FUSION, 2013, 53 (09)
  • [8] Inter-ELM Power Decay Length for JET and ASDEX Upgrade: Measurement and Comparison with Heuristic Drift-Based Model
    Eich, T.
    Sieglin, B.
    Scarabosio, A.
    Fundamenski, W.
    Goldston, R. J.
    Herrmann, A.
    [J]. PHYSICAL REVIEW LETTERS, 2011, 107 (21)
  • [9] Elmore S., 2018, P 45 EPS C PLASM PHY
  • [10] Impact of the plasma geometry on divertor power exhaust: experimental evidence from TCV and simulations with SolEdge2D and TOKAM3X
    Gallo, A.
    Fedorczak, N.
    Elmore, S.
    Maurizio, R.
    Reimerdes, H.
    Theiler, C.
    Tsui, C. K.
    Boedo, J. A.
    Faitsch, M.
    Bufferand, H.
    Ciraolo, G.
    Galassi, D.
    Ghendrih, P.
    Valentinuzzi, M.
    Tamain, P.
    [J]. PLASMA PHYSICS AND CONTROLLED FUSION, 2018, 60 (01)
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