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Title: Non-linear Alfvén wave interaction leading to resonant excitation of an acoustic mode in the laboratory

Abstract

The nonlinear three-wave interaction process at the heart of the parametric decay process is studied by launching counter-propagating Alfvén waves from antennas placed at either end of the Large Plasma Device [W. Gekelman et al., Rev. Sci. Instrum. 62, 2875 (1991)]. A resonance in the beat wave response produced by the two launched Alfvén waves is observed and is identified as a damped ion acoustic mode based on the measured dispersion relation. Other properties of the interaction including the spatial profile of the beat mode and response amplitude are also consistent with theoretical predictions for a three-wave interaction driven by a nonlinear ponderomotive force. A simple damped, driven oscillator model making use of the MHD equations well-predicts most of the observations, but the width of the resonance curve is still under investigation.

Authors:
;  [1]
  1. Department of Physics and Astronomy, University of California Los Angeles, Los Angeles, California 90095 (United States)
Publication Date:
OSTI Identifier:
22410375
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 22; Journal Issue: 5; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1070-664X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ALFVEN WAVES; AMPLITUDES; ANTENNAS; DISPERSION RELATIONS; EXCITATION; INTERACTIONS; MAGNETOHYDRODYNAMICS; NONLINEAR PROBLEMS; OSCILLATORS; PONDEROMOTIVE FORCE; RESONANCE

Citation Formats

Dorfman, S., and Carter, T. A. Non-linear Alfvén wave interaction leading to resonant excitation of an acoustic mode in the laboratory. United States: N. p., 2015. Web. doi:10.1063/1.4919275.
Dorfman, S., & Carter, T. A. Non-linear Alfvén wave interaction leading to resonant excitation of an acoustic mode in the laboratory. United States. doi:10.1063/1.4919275.
Dorfman, S., and Carter, T. A. Fri . "Non-linear Alfvén wave interaction leading to resonant excitation of an acoustic mode in the laboratory". United States. doi:10.1063/1.4919275.
@article{osti_22410375,
title = {Non-linear Alfvén wave interaction leading to resonant excitation of an acoustic mode in the laboratory},
author = {Dorfman, S. and Carter, T. A.},
abstractNote = {The nonlinear three-wave interaction process at the heart of the parametric decay process is studied by launching counter-propagating Alfvén waves from antennas placed at either end of the Large Plasma Device [W. Gekelman et al., Rev. Sci. Instrum. 62, 2875 (1991)]. A resonance in the beat wave response produced by the two launched Alfvén waves is observed and is identified as a damped ion acoustic mode based on the measured dispersion relation. Other properties of the interaction including the spatial profile of the beat mode and response amplitude are also consistent with theoretical predictions for a three-wave interaction driven by a nonlinear ponderomotive force. A simple damped, driven oscillator model making use of the MHD equations well-predicts most of the observations, but the width of the resonance curve is still under investigation.},
doi = {10.1063/1.4919275},
journal = {Physics of Plasmas},
issn = {1070-664X},
number = 5,
volume = 22,
place = {United States},
year = {2015},
month = {5}
}