Long-time tails do not necessarily imply self-organized criticality or the breakdown of the standard transport paradigm

Krommes, J.A. ; Ottaviani, M.

Princeton University. Plasma Physics Laboratory.

关键词: Stochastic Processes;    70 Plasma Physics And Fusion;    Plasma Simulation;    Plasma Confinement;    Fluctuations;   

DOI  :  10.2172/750264
RP-ID  :  PPPL--3421
RP-ID  :  AC02-76CH03073
RP-ID  :  750264

美国|英语

来源: UNT Digital Library

【 摘 要 】

Numerical measurements and analytical studies are performed on a stochastic model with features relevant to plasma confinement. Although the model lacks crucial features of self-organized criticality (SOC) and its transport can be computed by standard techniques, it nevertheless exhibits intermittency and algebraic time correlations. This suggests that SOC need not be the explanation for observed long-time tails in experimental fluctuation data. Arguments based on the renormalized spectral balance equation, and simulation of a standard nonlinear paradigm, predict a range of Hurst exponents in reasonable agreement with the observations without invoking submarginal dynamics.