Institut für Plasmaforschung Universität Stuttgart Plasma Turbulence at the Transition from Closed to Open Fieldlines Mirko Ramisch 07.07.2009.

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Presentation transcript:

Institut für Plasmaforschung Universität Stuttgart Plasma Turbulence at the Transition from Closed to Open Fieldlines Mirko Ramisch

2CWGM5, Stuttgart, Edge/SOL - transition [J. Horacek et al] Drift- waves Interchange- instabilities

3CWGM5, Stuttgart, Edge/SOL – dynamics in TJ-K Reduced confinement region

4CWGM5, Stuttgart, Probe array in TJ-K 8 tungsten pins Poloidal distance 5mm

5CWGM5, Stuttgart, „Blob“-dynamics [T.Happel et al, PRL 102, 2009]

6CWGM5, Stuttgart, Probability density function (PDF) of Isat [P. Abdul] S=-0.6 S=+0.9

7CWGM5, Stuttgart, Probe array in AUG 14 carbon pins Poloidal distance 3mm

8CWGM5, Stuttgart, Probability density function (PDF) of Isat #22505 AUG: “holes” “blobs” [B. Nold]

9CWGM5, Stuttgart, Phase velocity shear layer

10CWGM5, Stuttgart, Probe arrangement floating potential ion-saturation current [C. Lechte]

11CWGM5, Stuttgart, Radial profiles

12CWGM5, Stuttgart, Distribution of I i,sat fluctuations No indication of density holes Change in number of positive events (blobs) in edge shear region

13CWGM5, Stuttgart, Propagation of blobs U dia,i U ExB

14CWGM5, Stuttgart,  t: time dependence

15CWGM5, Stuttgart, Potential raise at plasma edge

16CWGM5, Stuttgart, Turbulent transport

17CWGM5, Stuttgart, Common: increasing number of intermittent events („blobs“) across separatrix Uncommon: reversal of phase velocity (mechanism?), „holes“ Insights from other experiments needed to work out differences and universalities, role of islands, mechanism of velocity reversal...