Bulletin of the American Physical Society
60th Annual Meeting of the APS Division of Plasma Physics
Volume 63, Number 11
Monday–Friday, November 5–9, 2018; Portland, Oregon
Session TP11: Poster Session VII: Basic Plasma Physics: Pure Electron Plasma, Strongly Coupled Plasmas, Self-Organization, Elementary Processes, Dusty Plasmas, Sheaths, Shocks, and Sources; Mini-conference on Nonlinear Waves and Processes in Space Plasmas - Posters; MHD and Stability, Transients (2), Runaway Electrons; NSTX-U; Spherical Tokamaks; Analytical and Computational Techniques; Diagnostics (9:30am-12:30pm)
Thursday, November 8, 2018
OCC
Room: Exhibit Hall A1&A
Abstract ID: BAPS.2018.DPP.TP11.60
Abstract: TP11.00060 : Interpretation of bi-coherence in space and lab plasma-wave dynamics*
Presenter:
G Riggs
(West Virginia Univ)
Authors:
G Riggs
(West Virginia Univ)
S Nogami
(West Virginia Univ)
M Koepke
(West Virginia Univ)
N Crocker
(UCLA)
G Howes
(Univ Iowa)
S Savin
(Space Research Inst, Russia)
V Budaev
(Space Research Inst, Russia, Kurchatov Institute, Russia)
L Zelenyi
(Space Research Inst, Russia)
Responsible bi-coherence analysis and hypothesis-testing requires adequate sampling and resolution. This investigation focuses on the assessment of temporal dynamics associated with the bispectrum cross-phase and amplitude. We detect, document and interpret wave-wave coupling evidenced in time series from interacting toroidal Alfven eigenmodes arising in DIII-D tokamak plasma, from super-low-frequency (0.02 - 10 millihertz) resonances near magnetospheric boundaries as measured by the Cluster satellite instruments, from a forced van der Pol oscillator, and from various audio signals, both recorded and contrived. We monitor the adjustable plasma parameters in the tokamak, natural time-varying conditions in the solar wind, driving-force frequency and amplitude in the van der Pol oscillator, and spectral content in the audio synthesizer. Examples of wave-wave interaction, daughter-wave generation, driven-oscillator phenomena, sideband production, and beat-wave coupling will be presented. The generality of the method is an advantage for interpreting nonlinear waves and processes across a variety of experimental platforms.
*Partial support from DOE grant DE-SC0018036 is gratefully acknowledged. This work is a subproject of the DIII-D Frontier Science Experiments campaign.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DPP.TP11.60
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