This title appears in the Scientific Report :
2005
Please use the identifier:
http://dx.doi.org/10.1007/s10582-005-0042-x in citations.
Turbulence investigations during ergodic divertor operation with induced 2/1 tearing mode
Turbulence investigations during ergodic divertor operation with induced 2/1 tearing mode
Within the last year of TEXTOR operation a major part of the experiments were dedicated to the interaction of the ergodized plasma edge, induced by the dynamic ergodic divertor (DED), with the core plasma. Systematic experiments are performed in the 3/1 configuration of the DED. Depending on , the D...
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Personal Name(s): | Krämer-Flecken, A. |
---|---|
Koslowski, H. R. / Liang, Y. / Zimmermann, O. / Biel, W. / Finken, K. H. / Loozen, X. / Schmitz, O. / Tokar, M. / Wolf, R. | |
Contributing Institute: |
Institut für Plasmaphysik; IPP |
Published in: | Czechoslovak journal of physics, 55 (2005) S. 295 - 306 |
Imprint: |
Praha
Academy of Sciences of the Czech Republic
2005
|
Physical Description: |
295 - 306 |
DOI: |
10.1007/s10582-005-0042-x |
Document Type: |
Journal Article |
Research Program: |
Kernfusion und Plasmaforschung |
Series Title: |
Czechoslovak Journal of Physics
55 |
Subject (ZB): | |
Publikationsportal JuSER |
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520 | |a Within the last year of TEXTOR operation a major part of the experiments were dedicated to the interaction of the ergodized plasma edge, induced by the dynamic ergodic divertor (DED), with the core plasma. Systematic experiments are performed in the 3/1 configuration of the DED. Depending on , the DED generates a locked 2/1 mode in the plasma at a critical current in the DED coils. Different diagnostics were used to measure the plasma response in the core and edge. The investigations in this paper are focused on the measurement of density fluctuation and the analysis of the coherent-mode structure outside the q = 2 surface using O-mode poloidal correlation reflectometry. A reduction of the quasi-coherent mode amplitude and frequency is observed, caused by the 2/1 mode together with a decrease of the density scale length. Moreover, the deduced poloidal rotation velocity at the q = 3 surface changes from the electron to the ion diamagnetic drift direction with the onset of the 2/1 island. Also a reduction of the density fluctuations is observed as well as a decrease in the poloidal correlation length. From Ar-injection a delayed inward propagation of the emission maximum is observed for different Ar ionization stages when the 2/1 mode is generated.Similar experiments with a slowly rotating DED show that the steepened density gradients are spatially localized and confirm the hypothesis that the 2/1 mode is responsible for the observations. | ||
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653 | 2 | 0 | |2 Author |a turbulence |
653 | 2 | 0 | |2 Author |a density fluctuations |
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