Journal
PHYSICS OF PLASMAS
Volume 16, Issue 5, Pages -Publisher
AIP Publishing
DOI: 10.1063/1.3125242
Keywords
fusion reactors; plasma electromagnetic wave propagation; plasma inertial confinement; plasma instability; plasma nonlinear processes; plasma oscillations; plasmons
Categories
Funding
- U. S. Department of Energy [DE-FC52-08NA28302]
- University of Rochester
- New York State Energy Research and Development Authority
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The two-plasmon-decay (TPD) instability in direct-drive irradiation OMEGA [J. M. Soures, R. L. McCrory, C. P. Verdon, , Phys. Plasmas 3, 2108 (1996)] experiments is seen in the half-integer harmonic emission. Experimental time-resolved omega/2 and 3 omega/2 spectra indicate that the linear theory for the absolute TPD instability reasonably predicts TPD thresholds. The plasma wave spectra do not, however, agree at all with the predictions of the linear theory. This is most likely a consequence of the nonlinear evolution of this instability once it is above threshold. This is demonstrated with spectral data obtained from spherical implosion experiments as well as planar target experiments. In the latter, Thomson scattering shows the importance of the Landau cutoff. For the TPD instability, the Landau cutoff is found to be respected in all spherical and planar target experiments. In addition, the maximum plasma wave amplitudes appear to occur near the Landau cutoff.
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