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.
van Milligen, B., Carreras, B., Pedrosa, M., Balbín, R., Hidalgo, C., Newman, D., et al. (1999). Long range correlations and universality in plasma edge turbulence. In Fusion Energy, Proceedings of the 17th International Conference on Plasma Physics and Controlled Nuclear Fusion Research (pp.1533-1536).
Long range correlations and universality in plasma edge turbulence
Riccardi C;Martines E;
1999
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.File | Dimensione | Formato | |
---|---|---|---|
023 - IAEA 98 van Milligen.pdf
Solo gestori archivio
Descrizione: Proceedings
Tipologia di allegato:
Publisher’s Version (Version of Record, VoR)
Dimensione
66.61 kB
Formato
Adobe PDF
|
66.61 kB | Adobe PDF | Visualizza/Apri Richiedi una copia |
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.