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Edge turbulence spectrum alterations driven by resonant fields

Authors :
Z A Brasilio
R. P. da Silva
R M Castro
M. V. A. P. Heller
IberĂȘ L. Caldas
Source :
Nuclear Fusion. 35:59-67
Publication Year :
1995
Publisher :
IOP Publishing, 1995.

Abstract

An ergodic magnetic structure is generated in the TBR-1 Tokamak boundary to handle heat flux and minimize impurity generation. In this work, the effect of this structure on the plasma edge turbulence is investigated. Thus, spectral alterations driven by perturbing magnetic fields created by resonant helical windings are observed in the small Tokamak TBR-1. The investigated oscillations are detected with an array of Langmuir and magnetic probes. Spectral and bispectral analyses revealed significant changes induced by the resonant helical windings, mainly in the MHD frequency band. Thus, whereas the known Mimov oscillation amplitude reduction is observed, the density and potential oscillation spectra are slightly affected. However, the bispectral analysis shows a clear reduction of the wave-wave mode coupling in the MHD frequency range, while the high frequency turbulent coupling is steadily reduced

Details

ISSN :
00295515
Volume :
35
Database :
OpenAIRE
Journal :
Nuclear Fusion
Accession number :
edsair.doi...........58cfb3ee7ad8aa98e41ef50648b76e96
Full Text :
https://doi.org/10.1088/0029-5515/35/1/i04