Experimental evidence of long-range correlations and self-similarity in plasma fluctuations
To better understand log time transport dynamics, techniques to investigate long-range dependences in plasma fluctuations have been applied to data from several confinement devices including tokamaks, stellarators, and reversed field pinch. The results reveal the self-similar character of the edge plasma fluctuations. This implies that the tail of the autocorreslation function decays as a power law and suggests that there is a superdiffusive component of the anomalous transport. Rescaled fluctuation and turbulent flux spectra from different devices also show a strong similarity. For a range of parameters corresponding to the tokamak ohmic regime and equivalent power for other devices, the spectral decay index may show a universal character.
Bibliographic Reference: Article: Physics of Plasmas, 6 (1999) 5, 1885-1892
Record Number: 199910808 / Last updated on: 1999-06-07
Original language: en
Available languages: en