Artículos de revistas
Recurrence quantification analysis of electrostatic fluctuations in fusion plasmas
Fecha
2008Registro en:
PHYSICS LETTERS A, v.372, n.7, p.1088-1095, 2008
0375-9601
10.1016/j.physleta.2007.07.088
Autor
Guimarães Filho, Zwinglio de Oliveira
Caldas, Ibere Luiz
Viana, Ricardo Luiz
Kurths, Jurgen
Nascimento, Ivan Cunha
Kuznetsov, Yurii
Institución
Resumen
We have investigated plasma turbulence at the edge of a tokamak plasma using data from electrostatic potential fluctuations measured in the Brazilian tokamak TCABR. Recurrence quantification analysis has been used to provide diagnostics of the deterministic content of the series. We have focused our analysis on the radial dependence of potential fluctuations and their characterization by recurrence-based diagnostics. Our main result is that the deterministic content of the experimental signals is most pronounced at the external part of the plasma column just before the plasma radius. Since the chaoticity of the signals follows the same trend, we have concluded that the electrostatic plasma turbulence at the tokamak plasma edge can be partially explained by means of a deterministic nonlinear system. (C) 2007 Elsevier B.V. All rights reserved.