Hybrid simulations of flow bursts in magnetically confined plasmas

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Gingell, Peter W.;
  • Subject: QC
    arxiv: Physics::Plasma Physics

Strongly localised concentrations or depressions of plasma density and magnetic\ud field strength (\blobs") are ubiquitous in the edge region of tokamak fusion\ud experiments. They contribute significantly to heating and transport in that region,\ud and therefore to ove... View more
  • References (103)
    103 references, page 1 of 11

    Chapter 1 Introduction 1 1.1 Fusion Energy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.2 Plasma Physics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.2.1 Single Particle Dynamics . . . . . . . . . . . . . . . . . . . . 4 1.2.2 The Vlasov Equation . . . . . . . . . . . . . . . . . . . . . . . 8 1.2.3 Fluid Approximation . . . . . . . . . . . . . . . . . . . . . . . 10 1.2.4 Plasma Instabilities . . . . . . . . . . . . . . . . . . . . . . . 13 1.2.5 Microinstabilities . . . . . . . . . . . . . . . . . . . . . . . . . 13 1.3 Tokamaks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 1.3.1 Turbulent Transport . . . . . . . . . . . . . . . . . . . . . . . 24 1.3.2 Blobs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

    Chapter 4 Heating by Multi-species Ion Gyro-scale Blobs 90 4.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90 4.2 Simulations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92 4.3 Ion Energisation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97 4.4 Momentum Transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . 102 4.5 Conclusions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105

    Chapter 5 Creation of Ion Gyro-scale Blobs by Kinetic Interchange and Kelvin-Helmholtz Instabilities 107 5.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107 5.2 Simulation Geometry . . . . . . . . . . . . . . . . . . . . . . . . . . . 108 5.3 Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110 5.3.1 Morphology . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110 5.3.2 Structure Statistics . . . . . . . . . . . . . . . . . . . . . . . . 113 5.3.3 Particle Di usion . . . . . . . . . . . . . . . . . . . . . . . . . 121 5.4 Conclusions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126 M. Agostini, S. J. Zweben, R. Cavazzana, P. Scarin, G. Serianni, R. J. Maqueda, and D. P. Stotler. Study of statistical properties of edge turbulence in the National Spherical Torus Experiment with the gas pu imaging diagnostic. Physics of Plasmas, 14(10):102305, October 2007. doi: 10.1063/1.2776912.

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    P. L. Auer, R. W. Kilb, and W. F. Crevier. Thermalization in the earth's bow shock. J. Geophys. Res., 76:2927{2939, 1971. doi: 10.1029/JA076i013p02927.

    A. Y. Aydemir. Convective transport in the scrape-o layer of tokamaks. Physics of Plasmas, 12(6):062503{+, June 2005. doi: 10.1063/1.1927539.

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