Statistics of low-frequency plasma fluctuations in a simple magnetized torus
2003 (English)In: Physics of Plasmas, ISSN 1070-664X, Vol. 10, no 7, 2686-2695 p.Article in journal (Refereed) Published
Statistical analysis is performed on time series of plasma potential and electron pressure fluctuations for two particular plasma states in a simple magnetized torus. In spite of the occurrence of cyclic trends in the signals, the analysis demonstrates the existence of long-range dependence on much longer time-scales than the plasma confinement time, and both Gaussian and non-Gaussian self-affinity is demonstrated in the probability distribution functions (PDFs) of increasingly coarse grained time series. Non-Gaussian PDFs for electron pressure fluctuations p are believed to arise from a nonlinear relationship between p and the plasma potential V. Non-Gaussian PDFs for V are well approximated by distributions derived from extreme value statistics.
Place, publisher, year, edition, pages
2003. Vol. 10, no 7, 2686-2695 p.
probe measurements, self-similarity, range, transport, universality, temperature, dependence
IdentifiersURN: urn:nbn:se:kth:diva-22599DOI: 10.1063/1.1577567ISI: 000183585500009OAI: oai:DiVA.org:kth-22599DiVA: diva2:341297
QC 201005252010-08-102010-08-10Bibliographically approved