Self-similarity of the plasma edge fluctuations
- Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-8070 (United States)
- Asociacion Euratom-Ciemat, 28040 Madrid (Spain)
- Max-Planck-Institut fuer Plasmaphysik, Euratom Association, 85740 Garching (Germany)
- Dipartamento di Fisica, Universita di Milano (Italy)
- JET Joint Undertaking, Abingdon Oxon, OX14 3EA (United Kingdom)
- Consorzio RFX, Padova (Italy)
- Institut fuer Experimentelle und Angewandte Physik, Kiel (Germany)
The rescaled range analysis techniques are used to investigate long-range dependence in plasma edge fluctuations [Mandelbrot and Wallis, Water Resources Res. {bold 4}, 909 (1969)]. This technology has been applied to data from several confinement devices such as tokamaks, stellarators, and reversed-field pinch. The results reveal the self-similar character of the electrostatic fluctuations at the plasma edge with self-similarity parameters ranging from 0.62 to 0.72. These results show that the tail of the autocorrelation function decays as a power law for time lags longer than the decorrelation time and as long as times of the order of the confinement time. In cold plasma devices (T{sub e}{lt}1thinspeV at the core), there is no evidence of algebraic tails in the autocorrelation function. Some other characteristic features of the autocorrelation function and power spectrum have been investigated. All of these features are consistent with plasma transport as characterized by self-organized criticality. {copyright} {ital 1998 American Institute of Physics.}
- OSTI ID:
- 658484
- Journal Information:
- Physics of Plasmas, Vol. 5, Issue 10; Other Information: PBD: Oct 1998
- Country of Publication:
- United States
- Language:
- English
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