Self-organized criticality properties of the turbulence-induced particle flux at the plasma edge of the HT-6M tokamak

Citation
Wh. Wang et al., Self-organized criticality properties of the turbulence-induced particle flux at the plasma edge of the HT-6M tokamak, CHIN PHYS L, 18(6), 2001, pp. 793-795
Citations number
18
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
CHINESE PHYSICS LETTERS
ISSN journal
0256-307X → ACNP
Volume
18
Issue
6
Year of publication
2001
Pages
793 - 795
Database
ISI
SICI code
0256-307X(200106)18:6<793:SCPOTT>2.0.ZU;2-Q
Abstract
The power spectrum and the probability distribution function (PDF) of the t urbulence-induced particle flux Gamma in the velocity shear layer of the HT -GM edge region have been measured and analysed. Three regions of frequency dependence (f(0), f(-1), f(-4)) have been observed in the spectrum of the Awe. The PDF of the flux displays a Gamma (-1) scaling over one decade in G amma. Using the rescaled-range statistical technique, we find that the degr ee of the self-similarity (Hurst exponent) of the particle flux in the meas ured region ranges from 0.64 to 0.83. All of these results may mean that th e plasma transport is in a state characterized by self-organized criticalit y.