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(THP2/07) Long-Range Correlations and Universality in Plasma Edge Turbulence

B. van Milligen, B. A. Carreras¹, M. A. Pedrosa, R. Balbín, C. Hidalgo, D. E. Newman¹, E. Sánchez, I. García-Cortés, J. Bleuel², M. Endler², C. Riccardi⁴, S. Davies³, G. F. Matthews^*, E. Martines⁵, V. Antoni⁵, A. Latten⁶ and T. Klinger⁶

Asociación Euratom-Ciemat, Avda. Complutense 22, 28040 Madrid, Spain
¹ Oak Ridge National Laboratory, Oak Ridge, Tennessee , U.S.A.
² EURATOM-IPP, Garching, Germany
³ JET Joint Undertaking, Abingdon, U.K.
⁴ Dipartimento di Fisica, Universita di Milano, Italy
⁵ Consorzio RFX, Padova, Italy
⁶ Institut für Experimentalphysik, Kiel, Germany

Abstract.  Long-range correlations in turbulence, associated with self-similarity of the fluctuations, are a signature of transport by avalanches as occurs in Self-Organized Critical systems. We have investigated long-range correlations in plasma edge fluctuations in a variety of fusion devices, using the Rescaled-Range and similar techniques. We find that the degree of self-similarity in confining devices is high and similar between devices, and much different from non-confining devices where it is low. Likewise, we find that turbulent spectra show a high degree of similarity between devices. These findings strongly indicate the existence of universality in plasma edge (ohmic) turbulence, and demonstrate its non-Gaussian character.

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