Bulletin of the American Physical Society
64th Annual Meeting of the APS Division of Plasma Physics
Volume 67, Number 15
Monday–Friday, October 17–21, 2022; Spokane, Washington
Session TO03: Fundamental Plasmas: Turbulence, Transport, and Shocks
9:30 AM–12:30 PM,
Thursday, October 20, 2022
Room: Ballroom 100 C
Chair: Forest Doss, LANL
Abstract: TO03.00001 : Fluctuations and Intermittent Transport in Single and Multiple Entangled Magnetized Plasma Pressure Filaments*
9:30 AM–9:42 AM
Presenter:
Richard D Sydora
(Univ of Alberta)
Authors:
Richard D Sydora
(Univ of Alberta)
Scott Karbashewski
(University of California, Berkeley)
Bart G Van Compernolle
(General Atomics - San Diego)
Matthew J Poulos
(Princeton Plasma Physics Laboratory)
Thomas Simala-Grant
(University of Alberta)
The origin of intermittent fluctuations in an experiment involving several interacting electron plasma pressure filaments in close proximity, embedded in a large linear magnetized plasma device, is investigated. The intermittent character of the fluctuating temperature and electric potential is caused by radially and azimuthally propagating turbulent structures that originate from pressure gradient-driven drift-Alfven instabilities near the edges of the filament bundle. The probability density function (PDF) of the fluctuations obtained from the Langmuir probe data is established to be non-Gaussian and the time series contains uncorrelated Lorentzian pulses. This is suggestive of deterministic chaos in the underlying dynamics which is supported by the complexity-entropy (CH-plane) analysis of the time series. Furthermore, application of rescaled adjusted range (R/S) statistics to the time series reveals a double Hurst exponent, one associated with the behaviour of shorter time scale phenomena such as the Lorentzian pulses and intermittency, and the second connected to the longer time scales of density, temperature and vorticity mixing in the interacting filaments. Basic features of this nonlinear dynamical system are captured in a 3D gyrokinetic simulation of the filament-filament interaction.
*This work was supported by NSERC, Canada and was performed at the Basic Plasma Science Facility supported by DOE and NSF, with major facility instrumentation developed via an NSF award AGS-9724366.
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