Applications of noise theory to plasma fluctuations
by Li, Bo, Ph.D., THE UNIVERSITY OF TEXAS AT AUSTIN, 2007, 75 pages; 3277561

Abstract:

Fluctuation phenomena are important to many physical systems, such as the fusion plasma. Noise theory is used to study the time and space correlations of stationary Markovian fluctuations that are statistically homogeneous and isotropic. The relaxation of the fluctuations is modeled by the diffusion equation. The spatial correlations are modeled by the exponential decay. Based on these models, the correlation function and the power spectral density of random fluctuations are calculated. We find that the diffusion process can give rise to the decay of the correlation function and a broad frequency spectrum of random fluctuations. We also find that the fluctuation-induced transport coefficients may be estimated by the correlation length and the correlation time. The theoretical results are compared with the observed plasma density fluctuations from tokamak and helimak experiments.

 
AdviserRichard D. Hazeltine
SchoolTHE UNIVERSITY OF TEXAS AT AUSTIN
SourceDAI/B 68-08, p. , Dec 2007
Source TypeDissertation
SubjectsTheoretical physics; Plasma physics
Publication Number3277561
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