Evidence of long-distance correlation of fluctuations during edge transitions to improved-confinement regimes in the TJ-II stellarator.
Long-distance coupling between edge parameters' fluctuations has been investigated in the TJ-II stellarator. Results show long-range correlations in potential fluctuations, which are amplified by the development of radial electric fields during transitions to improved-confinement regimes, whereas there is no correlation between ion saturation current signals. These experimental findings suggest the importance of long-range correlations as a new fingerprint of the plasma behavior during the development of edge shear flows and the key role of electric fields to amplify them.
Pedrosa
M A
MA
Laboratorio Nacional de Fusión, Asociación EURATOM-CIEMAT, 28040-Madrid, Spain.
Silva
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C
Hidalgo
C
C
Carreras
B A
BA
Orozco
R O
RO
Carralero
D
D