Interplay between confinement, turbulence and magnetic topology Nils P. Basse, S. Zoletnik 1, W. L. Rowan 2 et al. MIT Plasma Science and Fusion Center.

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Interplay between confinement, turbulence and magnetic topology Nils P. Basse, S. Zoletnik 1, W. L. Rowan 2 et al. MIT Plasma Science and Fusion Center 1 KFKI-RMKI, Euratom Association, Budapest, Hungary 2 Fusion Research Center, University of Texas at Austin This idea originates from density fluctuation studies of Wendelstein 7-AS plasmas with a small-angle scattering diagnostic. C-Mod Monday Meeting, 22nd of March 2004

W7-AS density fluctuations Wavenumber is 15 cm-1 Dotted line is good confinement (q_a = 2.9) Solid line is bad confinement (q_a = 2.75)

EFIT equilibrium

Waveforms shot Scorecard: 9 full length plasmas, 6 early disruptions, 1 fizzle. We had 7 no power shots (cycle and engineering tests, computer and CAMAC problems). We also had breaker faults and transmitter D was lost in shot 7.

PCI fluctuations, central channel

Reflectometry fluctuations, 132 GHz

Preliminary conclusions Always takes some shots to obtain density control for these inner wall limited L-mode discharges. Initial analysis of density fluctuation autopower spectra shows that no discernable change is observed as q_a is lowered from 2.9 to Correlations between various turbulent fields, e.g. magnetic and density fluctuations, may display some differences. Analysis to be done. Temperature profiles still need to be checked; so far no clear development has been found. If additional experiments are made, I suggest to make a density scan in Ohmic plasmas. The transition was quite sensitive to density in W7-AS: High density lead to a large transition.