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Title: Saturation of radiation-induced parametric instabilities by excitation of Langmuir turbulence

Abstract

Progress made in the last few years in the calculation of the saturation spectra of parametric instabilities which involve Langmuir daughter waves will be reviewed. These instabilities include the ion acoustic decay instability, the two plasmon decay instability (TPDI), and stimulated Raman scattering (SRS). In particular I will emphasize spectral signatures which can be directly compared with experiment. The calculations are based on reduced models of driven Laugmuir turbulence. Thomson scattering from hf-induced Langmuir turbulence in the unpreconditioned ionosphere has resulted in detailed agreement between theory and experiment at early times. Strong turbulence signatures dominate in this regime where the weak turbulence approximation fails completely. Recent experimental studies of the TPDI have measured the Fourier spectra of Langmuir waves as well as the angular and frequency, spectra of light emitted near 3/2 of the pump frequency again permitting some detailed comparisons with theory. The experiments on SRS are less detailed but by Thomson scattering the secondary decay of the daughter Langmuir wave has been observed. Scaling laws derived from a local model of SRS saturation are compared with full simulations and recent Nova experiments.

Authors:
;  [1];  [2]
  1. Los Alamos National Lab., NM (United States)
  2. Lodestar Research Inc., Boulder, CO (United States)
Publication Date:
Research Org.:
Los Alamos National Lab., NM (United States)
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
148687
Report Number(s):
LA-UR-95-3516; CONF-9510253-1
ON: DE96002596
DOE Contract Number:  
W-7405-ENG-36
Resource Type:
Conference
Resource Relation:
Conference: Plasma physics workshop, Trieste (Italy), 16-20 Oct 1995; Other Information: PBD: [1995]
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION; PLASMA WAVES; PARAMETRIC INSTABILITIES; SATURATION; ION ACOUSTIC WAVES; PLASMONS; RAMAN EFFECT; INERTIAL CONFINEMENT

Citation Formats

Dubois, D.F., Rose, H.A., and Russell, D. Saturation of radiation-induced parametric instabilities by excitation of Langmuir turbulence. United States: N. p., 1995. Web.
Dubois, D.F., Rose, H.A., & Russell, D. Saturation of radiation-induced parametric instabilities by excitation of Langmuir turbulence. United States.
Dubois, D.F., Rose, H.A., and Russell, D. Fri . "Saturation of radiation-induced parametric instabilities by excitation of Langmuir turbulence". United States. https://www.osti.gov/servlets/purl/148687.
@article{osti_148687,
title = {Saturation of radiation-induced parametric instabilities by excitation of Langmuir turbulence},
author = {Dubois, D.F. and Rose, H.A. and Russell, D.},
abstractNote = {Progress made in the last few years in the calculation of the saturation spectra of parametric instabilities which involve Langmuir daughter waves will be reviewed. These instabilities include the ion acoustic decay instability, the two plasmon decay instability (TPDI), and stimulated Raman scattering (SRS). In particular I will emphasize spectral signatures which can be directly compared with experiment. The calculations are based on reduced models of driven Laugmuir turbulence. Thomson scattering from hf-induced Langmuir turbulence in the unpreconditioned ionosphere has resulted in detailed agreement between theory and experiment at early times. Strong turbulence signatures dominate in this regime where the weak turbulence approximation fails completely. Recent experimental studies of the TPDI have measured the Fourier spectra of Langmuir waves as well as the angular and frequency, spectra of light emitted near 3/2 of the pump frequency again permitting some detailed comparisons with theory. The experiments on SRS are less detailed but by Thomson scattering the secondary decay of the daughter Langmuir wave has been observed. Scaling laws derived from a local model of SRS saturation are compared with full simulations and recent Nova experiments.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Dec 01 00:00:00 EST 1995},
month = {Fri Dec 01 00:00:00 EST 1995}
}

Conference:
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