Journal
JOURNAL OF NUCLEAR MATERIALS
Volume 337, Issue 1-3, Pages 332-336Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jnucmat.2004.10.010
Keywords
Heliotron J; edge-plasma; fluctuation and turbulence; intermittent transport
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Low frequency and small-scale fluctuations of density and potential near the last closed flux surface are investigated by using Langmuir probes for the second harmonic ECH plasmas in a helical-axis heliotron device, Heliotron J. The existence of a plasma layer with a radial electric field shear was indicated near the last closed flux surface. Near this layer, the reversal of phase velocity and de-correlation of the fluctuations were observed. On the other hand, it is suggested that a considerable fraction of the fluctuation induced particle flux is carried off through the intermittent events. Preliminary analyses to classify the PDFs of the ion-saturation current fluctuation as stable Levy distributions demonstrate that the Levy index decreases from the inner to the outer region of edge plasma, suggesting that the PDFs near the boundary region of Heliotron J are nearly Gaussian, whereas at the outer regions of plasma they become strongly non-Gaussian. (c) 2004 Elsevier B.V. All rights reserved.
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