 |
|
 |
|
 |
|
 |
|
 |
Return To: Session THP2 - Theory 2 (Transport) (Friday, 23
Prev Page: (THP2/06) Nonlinear Full Torus Calculations of Resistive Pressure-Gradient-Driven
Next Page: (THP2/09) Resistive edge modes, a scenario for the
|
|
|
B. van Milligen , B. A. Carreras 1,
M. A. Pedrosa , R. Balbín , C. Hidalgo ,
D. E. Newman 1, E. Sánchez ,
I. García-Cortés , J. Bleuel 2,
M. Endler 2, C. Riccardi 4, S. Davies 3,
G. F. Matthews *, E. Martines 5, V. Antoni 5,
A. Latten 6 and T. Klinger 6
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.
IAEA 1999