Saturation of the two-plasmon decay instability in long-scale-length plasmas relevant to direct-drive inertial confinement fusion

D. H. Froula, B. Yaakobi, S. X. Hu, P. Y. Chang, R. S. Craxton, D. H. Edgell, R. Follett, D. T. Michel, J. F. Myatt, W. Seka, R. W. Short, A. Solodov, C. Stoeckl

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43 Citations (Scopus)

Abstract

Measurements of the hot-electron generation by the two-plasmon-decay instability are made in plasmas relevant to direct-drive inertial confinement fusion. Density-scale lengths of 400μm at n cr/4 in planar CH targets allowed the two-plasmon-decay instability to be driven to saturation for vacuum intensities above ∼3.5×1014Wcm -2. In the saturated regime, ∼1% of the laser energy is converted to hot electrons. The hot-electron temperature is measured to increase rapidly from 25 to 90keV as the laser beam intensity is increased from 2 to 7×1014Wcm -2. This increase in the hot-electron temperature is compared with predictions from nonlinear Zakharov models.

Original languageEnglish
Article number165003
JournalPhysical review letters
Volume108
Issue number16
DOIs
Publication statusPublished - 2012 Apr 18

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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