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.
Laboratorio Nacional de Fusión, Asociación EURATOM-CIEMAT, 28040-Madrid, Spain.
M A
MA
Pedrosa
C
C
Silva
C
C
Hidalgo
B A
BA
Carreras
R O
RO
Orozco
D
D
Carralero