Experimental Validation of a Filament Transport Model in Turbulent Magnetized Plasmas.

In a wide variety of natural and laboratory magnetized plasmas, filaments appear as a result of interchange instability. These convective structures substantially enhance transport in the direction perpendicular to the magnetic field. According to filament models, their propagation may follow different regimes depending on the parallel closure of charge conservation. This is of paramount importance in magnetic fusion plasmas, as high collisionality in the scrape-off layer may trigger a regime transition leading to strongly enhanced perpendicular particle fluxes. This work reports for the first time on an experimental verification of this process, linking enhanced transport with a regime transition as predicted by models. Based on these results, a novel scaling for global perpendicular particle transport in reactor relevant tokamaks such as ASDEX-Upgrade and JET is found, leading to important implications for next generation fusion devices.

[1]  E. Wolfrum,et al.  Magnetic field dependence of the blob dynamics in the edge of ASDEX upgrade L-mode plasmas , 2014 .

[2]  E. Wolfrum,et al.  The influence of finite ion temperature on plasma blob dynamics , 2014 .

[3]  A. Fasoli,et al.  Cross-field motion of plasma blobs in an open magnetic field line configuration. , 2009, Physical review letters.

[4]  プラズマ・核融合学会.  Plasma and Fusion Research , 2006 .

[5]  U. Stroth,et al.  Influence of temperature fluctuations on plasma turbulence investigations with Langmuir probes , 2011, 1111.4091.

[6]  J. Madsen,et al.  Radial convection of finite ion temperature, high amplitude plasma blobs , 2014, 1404.0546.

[7]  J. Dungey.  Journal of plasma physics , 1967 .

[8]  D. Russell,et al.  Collisionality and magnetic geometry effects on tokamak edge turbulent transport. II. Many-blob turbulence in the two-region model , 2007 .

[9]  D. A. D’Ippolito,et al.  Recent theoretical progress in understanding coherent structures in edge and SOL turbulence , 2008, Journal of Plasma Physics.

[10]  Ericka Stricklin-Parker,et al.  Ann , 2005 .

[11]  Shuichi Takamura,et al.  Chapter 4: Power and particle control , 2007 .

[12]  James Myra,et al.  Collisionality and magnetic geometry effects on tokamak edge turbulent transport. I. A two-region model with application to blobs , 2006 .

[13]  H. Maring,et al.  Journal of Geophysical Research , 1949, Nature.

[14]  M. Greenwald,et al.  Particle transport in the scrape-off layer and its relationship to discharge density limit in Alcator C-Mod , 2001 .

[15]  B. Leblanc,et al.  Blob birth and transport in the tokamak edge plasma: analysis of imaging data , 2006 .

[16]  D. Carralero,et al.  An experimental investigation of the high density transition of the scrape-off layer transport in ASDEX Upgrade , 2014, 1407.3618.

[17]  M. Kivelson,et al.  Galileo evidence for rapid interchange transport in the Io torus , 1997 .

[18]  M. Dougherty,et al.  Cassini evidence for rapid interchange transport at Saturn , 2009 .

[19]  S. Zweben,et al.  Edge turbulence measurements in toroidal fusion devices , 2007 .

[20]  G. G. Stokes.  "J." , 1890, The New Yale Book of Quotations.

[21]  L. C. Woods.  Physics of plasmas , 2003 .

[22]  W. Fundamenski,et al.  Radial interchange motions of plasma filaments , 2006 .

[23]  Zensho Yoshida,et al.  MHD Stability in Flowing Plasmas: Connection between Fusion Plasma and Astrophysics Research , 2007 .

[24]  D. G. Whyte,et al.  Comparison of particle transport in the scrape-off layer plasmas of Alcator C-Mod and DIII-D , 2005 .

[25]  G. Birkenmeier,et al.  The influence of plasma edge dynamics on blob properties in the stellarator TJ-K , 2013 .

[26]  U. Stroth,et al.  Filament velocity scaling laws for warm ions , 2013 .

[27]  Remo Guidieri.  Res , 1995, RES: Anthropology and Aesthetics.

[28]  Physics Letters , 1962, Nature.

[29]  Travis W. Hill,et al.  Corotating magnetospheric convection , 1981 .

[30]  Sergei Krasheninnikov,et al.  On scrape off layer plasma transport , 2001 .

[31]  K. Khurana,et al.  Observations of thermal plasmas in Jupiter's magnetotail , 2002 .

[32]  Francis F. Chen,et al.  Resistive Overstabilities and Anomalous ``Diffusion'' , 1965 .

[33]  M. Kivelson,et al.  Magnetospheric Interchange Motions , 1989 .

[34]  L. Giannone,et al.  Measurements and modelling of electrostatic fluctuations in the scrape-off layer of ASDEX , 1995 .

[35]  W. Fundamenski,et al.  Turbulent transport in the TCV SOL , 2007 .

[36]  S. Cowley,et al.  Interchange instability of the plasma disk in Jupiter's middle magnetosphere and its relation to the radial plasma density distribution , 2006 .

[37]  T. Evans,et al.  Transport by intermittent convection in the boundary of the DIII-D tokamak , 2001 .

[38]  T. Evans,et al.  Far SOL transport and main wall plasma interaction in DIII-D , 2004 .

[39]  R. Kube,et al.  Velocity scaling for filament motion in scrape-off layer plasmas , 2011 .