Journal ArticleDOI
Edge turbulence measurements in toroidal fusion devices
S. J. Zweben,Jose Boedo,Olaf Grulke,C. Hidalgo,Brian LaBombard,R. J. Maqueda,P. Scarin,J. L. Terry +7 more
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TLDR
In this article, the authors reviewed measurements of edge plasma turbulence in toroidal magnetic fusion devices with an emphasis on recent results in tokamaks, showing that the dominant feature of edge turbulence is a high level of broadband density fluctuations with a relative amplitude δn/n ~ 5-100%.Abstract:
This paper reviews measurements of edge plasma turbulence in toroidal magnetic fusion devices with an emphasis on recent results in tokamaks. The dominant feature of edge turbulence is a high level of broadband density fluctuations with a relative amplitude δn/n ~ 5–100%, accompanied by large potential and electron temperature fluctuations. The frequency range of this turbulence is ~10 kHz–1 MHz, and the size scale is typically ~0.1–10 cm perpendicular to the magnetic field but many metres along the magnetic field, i.e. the structure is nearly that of 2D 'filaments'. Large intermittent bursts or 'blobs' are usually observed in the scrape-off layer. Diagnostic and data analysis techniques are reviewed and the main experimental results are summarized. Recent comparisons of experimental results with edge turbulence theory are discussed, and some directions for future experiments are suggested.read more
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Convective transport by intermittent blob-filaments: Comparison of theory and experiment
TL;DR: In this article, the relationship between the experimental and theoretical results on blob formation is discussed, and the authors present a detailed review of the experimental results and theoretical analysis of blob formation in toroidal plasmas.
Journal ArticleDOI
Heuristic drift-based model of the power scrape-off width in low-gas-puff H-mode tokamaks
TL;DR: In this article, a heuristic model for the plasma scrape-off width in low-gas-puff tokamak H-mode plasmas is introduced, which is a modification for open field lines of Pfirsch- Schl¨ uter flows to include order-unity sinks to the divertors.
Journal ArticleDOI
Recent theoretical progress in understanding coherent structures in edge and SOL turbulence
TL;DR: In this paper, the authors review some theoretical aspects of the dynamics of the mesoscale filaments extending along the magnetic field lines in the edge plasma, which are often called ‘blobs’.
Transport by intermittency in the boundary of the diii-d tokamak
Jose Boedo,Dmitry Rudakov,R.A. Moyer,G. R. McKee,R.J. Colchin,M.J. Schaffer,P. G. Stangeby,W. P. West,S.L. Allen,Todd Evans,R. J. Fonck,E. M. Hollmann,Sergei Krasheninnikov,Anthony Leonard,W. M. Nevins,M.A. Mahdavi,G.D. Porter,George Tynan,Dennis Whyte,Xueqiao Xu +19 more
TL;DR: A271 TRANSPORT by INTERMITTENCY in the BOUNDARY of the DIII-D TOKAMAK in L- and H-mode discharges is described in this article.
Journal ArticleDOI
Plasma-surface interaction, scrape-off layer and divertor physics:Implications for ITER
Bruce Lipschultz,Xavier Bonnin,G. F. Counsell,A. Kallenbach,A. Kukushkin,K. Krieger,Anthony Leonard,A. Loarte,Rudolf Neu,R.A. Pitts,T.D. Rognlien,J. Roth,C.H. Skinner,J.L. Terry,E. Tsitrone,D.G. Whyte,S. J. Zweben,Nobuyuki Asakura,D. P. Coster,R.P. Doerner,R. Dux,G. Federici,M.E. Fenstermacher,Wojciech Fundamenski,Philippe Ghendrih,A. Herrmann,Jiansheng Hu,Sergei Krasheninnikov,G. Kirnev,Arkadi Kreter,V. A. Kurnaev,Brian LaBombard,S. Lisgo,T. Nakano,Noriyasu Ohno,H. D. Pacher,J.I. Paley,Y. Pan,G. Pautasso,V. Philipps,V. Rohde,Dmitry Rudakov,P.C. Stangeby,Shuichi Takamura,Tetsuo Tanabe,Y. Yang,S. Zhu +46 more
TL;DR: In this article, a review of recent work in scrape-off layer (SOL) and divertor physics is presented, where new and existing data from a variety of experiments have been used to make cross-experiment comparisons with implications for further research and ITER.
References
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Wavelet Transforms and their Applications to Turbulence
TL;DR: Wavelet transforms are recent mathematical techniques, based on group theory and square integrable representations, which allows one to unfold a signal, or a field, into both space and scale, and possibly directions.
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Andrew Guthrie,R. K. Wakerling +1 more
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Drift waves and transport
TL;DR: In this paper, a wealth of information obtained from quasistationary laboratory experiments for plasma confinement is reviewed for drift waves driven unstable by density gradients, temperature gradients and trapped particle effects.