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[Untitled]

Authors :
M. Schubert
H. Thomsen
M. Endler
Source :
Czechoslovak Journal of Physics. 51:1079-1086
Publication Year :
2001
Publisher :
Springer Science and Business Media LLC, 2001.

Abstract

The fluctuations in the edge plasmas of magnetic fusion experiments are thought to play an important role in terms of anomalous energy and particle transport. Experiments on Wendelstein 7-AS were conducted with the primary goal to investigate the performance of influencing and modifying the turbulence in the plasma boundary using electrical probes. Two movable poloidal probe arrays were used for the experiments, one located on the inboard side of the vessel and the other on the outboard side. A subset of probe tips was used for actively driving the plasma by different control signals, the remaining probes collected fluctuation data in the plasma boundary. Poloidally, we find a significant cross-correlation between active and passive probes. From analysis of the coherency and phases of the passive probe tips, it can clearly be seen that the background E×B-rotation of the plasma plays a crucial role for the applied signals. In the case of externally driven waves by several phase-locked active probes, the direction of the wave propagation with respect to the plasma rotation (co- or counter-rotating) is essential for a proper coupling to the turbulence. In toroidal direction we find that the propagation of the signals along the magnetic field lines depends on co- or counter-rotation with respect to the background plasma rotation.

Details

ISSN :
00114626
Volume :
51
Database :
OpenAIRE
Journal :
Czechoslovak Journal of Physics
Accession number :
edsair.doi...........3fdc367f9c6d15ffa81dc41677afe5c1
Full Text :
https://doi.org/10.1023/a:1012850302128