Journal
PHYSICAL REVIEW LETTERS
Volume 86, Issue 3, Pages 428-431Publisher
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.86.428
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We present the results of the first reduced model simulations of the nonlinear development of the two-plasmon decay instability in an inhomogeneous plasma, including properties of the : harmonic emission. A sharp increase in radiation and Langmuir turbulence fluctuation levels occurs above a threshold laser intensity that depends on initial fluctuation levels. We study the competition between the linear propagation of Langmuir waves in the density gradient and the nonlinear saturation due to the Langmuir decay instability. The secondary decay Langmuir waves can provide the dominant source of the radiation and are essential to explain experiments.
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