Conference on Perspectives in Nonlinear Dynamics (2019)
About the Event
The Conference on Perspectives in Nonlinear Dynamics PNLD 2019 was held between 16 and 19 July 2019 at ICTP-SAIFR, São Paulo, Brazil.
PNLD 2019 was a satellite to STATPHYS 27 which had been held from 8-12 July 2019 in Buenos Aires, Argentina in the preceding week. The PNLD series of meetings have been held as satellites to the STATPHYS conferences since 2004, and thus this is the fifth in the series.
The main aim in having this meeting in São Paulo was to focus on the open issues in Nonlinear science and to identify the directions in which the field is evolving. A second aim of the meeting was to bring together physicists working in the region and across the developing world.
Presentation Information
Type
Poster presentation.
Title
Dynamical nature of plasma density fluctuations in tokamak TCABR
Authors
C. Crepaldi & Z. O. Guimarães-Filho
Abstract
One of the factors that compromise the quality of the confinement of magnetically confined plasma is the anomalous transport of particles attributed to the electrostatic turbulence observed at the edge region of the plasma. There is no consensus yet about the dynamical nature of these fluctuations, and it is possible to find in the literature models that treat it as chaotic or stochastic.
One of the methods that proposes to distinguish the dynamical nature of fluctuations in time series is the Complexity-Entropy Diagram, a method that has recently been used in several areas, among them Plasma Physics.
In this work I shall present the results obtained using this method applied in the ion saturation current signal measured by Langmuir probes in the tokamak TCABR and compare it to published results of similar studies done in other machines.
References
- BANDT, C. and POMPE, B. Permutation Entropy: A Natural Complexity Measure for Time Series. Physical Review Letters 88 (2002) 174102.
- ROSSO, O. et al. Distinguishing noise from chaos. Physical Review Letters 99 (2007) 154102.
- MAGGS, J. E. et al. Chaotic density fluctuations in L-mode plasmas of the DIII-D tokamak. Plasma Physics and Controlled Fusion 57 (2015) 045004.
- ZHU, Z. et al. Chaotic edge density fluctuations in the Alcator C-Mod tokamak. Physics of Plasmas 24 (2017) 042301.