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

M. A. Pedrosa, C. Silva, C. Hidalgo, B. A. Carreras, R. O. Orozco, and D. Carralero (TJ-II team)
Phys. Rev. Lett. 100, 215003 – Published 29 May 2008

Abstract

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.

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  • Received 4 February 2008

DOI:https://doi.org/10.1103/PhysRevLett.100.215003

©2008 American Physical Society

Authors & Affiliations

M. A. Pedrosa1, C. Silva2, C. Hidalgo1, B. A. Carreras3, R. O. Orozco1, and D. Carralero1 (TJ-II team)

  • 1Laboratorio Nacional de Fusión, Asociación EURATOM-CIEMAT, 28040-Madrid, Spain
  • 2Centro de Fusão Nuclear, Instituto Superior Técnico, Associaçao EURATOM-IST, 1049-001-Lisbon, Portugal
  • 3BACV Solutions, Inc., Oak Ridge, Tennessee 37830, USA

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Issue

Vol. 100, Iss. 21 — 30 May 2008

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