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(EX/P5-10) Experimental/Theoretical Comparisons of the Turbulence in the Scrape-Off-Layers of Alacator C-Mod, DIII-D, and NSTX

J.L. Terry¹⁾, S.J. Zweben²⁾, D.L. Rudakov³⁾, J.A. Boedo³⁾, K. Hallatschek⁴⁾, R.J. Maqueda⁵⁾, R.A. Moyer³⁾, B. Bai¹⁾, C.J. Boswell¹⁾, M. Greenwald¹⁾, S. Krasheninnikov³⁾, B. LaBombard¹⁾, D. Kopon¹⁾, A.W. Leonard⁶⁾, M.A. Mahdavi⁶⁾, G.R. McKee⁷⁾, W.M. Nevins⁸⁾, B.N. Rogers⁹⁾, P.C. Stangeby¹⁰⁾, D. Stotler²⁾, J.G. Watkins¹¹⁾, W.P. West⁶⁾, D.G. Whyte³⁾, X.Q. Xu⁸⁾

¹⁾ Massachusetts Institute of Technology, Cambridge, USA
²⁾ Princeton Plasma Physics Laboratory, Princeton, NJ, USA
³⁾ University of California, San Diego, CA, USA
⁴⁾ Max Planck Institute of Plasma Physics, Garching, Germany
⁵⁾ Los Alamos National Laboratories, Los Alamos, NM, USA
⁶⁾ General Atomics, San Diego, CA, USA
⁷⁾ University of Wisconsin, Madison, WI, USA
⁸⁾ Lawrence Livermore Laboratory, Livermore, CA, USA
⁹⁾ Dartmouth University, Hanover, NH, USA
¹⁰⁾ University of Toronto, Institute for Aerospace Studies, Toronto, Canada
¹¹⁾ Sandia National Laboratories, Albuquerque, NM, USA

Abstract. The intermittent turbulent transport in the Scrape-Off Layers of Alcator C-Mod, DIII-D, and NSTX is studied experimentally. In C-Mod and NSTX the turbulence is imaged with a very high density of spatial measurements. The 2D structure and dynamics of emission from a localized gas puff are observed, and intermittent features (also sometimes called ``blobs'') are typically seen. The intermittent features are often born near the separatrix and propagate predominately outward and poloidally. Qualitatively similar features (but with a larger size-scale) are also seen in the NSTX SOL. On DIII-D the edge turbulence is imaged using BES, and similar intermittent features are seen. Also the fluctuating components of density, temperature and poloidal electric field are simultaneously measured using a reciprocating Langmuir probe array. The density and temperature fluctuations have strongly non-Gaussian statistics, and events with amplitudes above 10 times the mean level are responsible for large fractions of the net particle and heat transport. The experimental observations from C-Mod are compared with numerical simulations of electromagnetic turbulence in a 3D flux tube at the plasma edge.

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IAEA 2003