[Table of Contents]

Plasma and Fusion Research

Volume 5, 013 (2010)

Regular Articles

Formation, Spatiotemporal Dynamics, and Control of Structures in Weakly Developed Drift Wave Turbulence
Olaf GRULKE1,2), Thomas WINDISCH1), Christian BRANDT1), Stefan ULLRICH1) and Thomas KLINGER1,2)
1)
MPI for Plasma Physics, EURATOM Association, 17491 Greifswald, Germany
2)
Ernst-Moritz-Arndt University, 17489 Greifswald, Germany
(Received 2 September 2008 / Accepted 8 December 2009 / Published 12 May 2010)

Abstract

Experimental investigations of the evolution of the dynamics of drift wave turbulence in a linear high-density helicon plasma device are presented. The turbulent density fluctuations in the plasma edge are characterized by large intermittent events caused by radially propagating turbulent structures, which are formed in the radial plasma density region due to increased cross-field transport by a quasi-coherent drift wave mode. Similar to coherent drift wave modes the turbulent structures are correlated with fluctuating parallel currents. The role of fluctuating currents parallel to the ambient magnetic field in the evolution of coherent drift wave modes and drift turbulence is highlighted by investigations of the interaction of drift wave fluctuations with externally driven currents. Frequency pulling of coherent drift wave modes over a frequency range of up to 30% of the natural drift wave frequency is demonstrated. Furthermore, the drive of mode-selective current patterns allow for complete synchronization of drift wave turbulence and consequently leads to a strong reduction of the associated fluctuation-induced transport.

Keywords

laboratory plasma, drift wave turbulence, turbulent structures, turbulence control

DOI: 10.1585/pfr.5.013

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This paper may be cited as follows:

Olaf GRULKE, Thomas WINDISCH, Christian BRANDT, Stefan ULLRICH and Thomas KLINGER, Plasma Fusion Res. 5, 013 (2010).