Evidence of Long-Distance Correlation of Fluctuations during Edge Transitions to Improved-Confinement Regimes in the TJ-II Stellarator

Journal Article · Fri May 30 04:00:00 EDT 2008 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.100.215003· OSTI ID:21132469

Pedrosa, M A; Hidalgo, C; Orozco, R O; Carralero, D ^[1]; Silva, C ^[2]; Carreras, B A ^[3]

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1. Laboratorio Nacional de Fusion, Asociacion EURATOM-CIEMAT, 28040-Madrid (Spain)
2. Centro de Fusao Nuclear, Instituto Superior Tecnico, Associacao EURATOM-IST, 1049-001-Lisbon (Portugal)
3. BACV Solutions, Inc., Oak Ridge, Tennessee 37830 (United States)

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 th0008.

• OSTI ID: 21132469
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 21 Vol. 100; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
CORRELATIONS
ELECTRIC FIELDS
PLASMA
PLASMA CONFINEMENT
SIGNALS
TJ-II HELIAC