NDLI: Fast Saturation of Two Plasmon Decay and Stimulated Raman Scattering in Kinetic Simulations for Shock Ignition

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Fast Saturation of Two Plasmon Decay and Stimulated Raman Scattering in Kinetic Simulations for Shock Ignition

Content Provider	Semantic Scholar
Author	Riconda, C. Weber, Stefan Klimo, Ondřej Héron, Anne Tikhonchuk, Vladimir
Copyright Year	2012
Abstract	Two-Plasmon Decay (TPD) and Stimulated Raman Scattering (SRS) are investigated for conditions relevant for the shock ignition (SI) scheme of inertial confinement fusion. Several picosends of the interaction of an intense laser beam at 3w, propagating in a hot, large-scale, non-uniform plasma are studied by two-dimensional particle-in-cell (PIC) simulations [1, 2]. It is found that TPD is developing together with SRS creating a broad spectrum of plasma waves in the region near the quarter-critical density. However, in all cases studied in simulations, TPD and SRS are active only during a few hundred laser cycles. TPD saturation is due to plasma cavitation seeded by the low frequency beating of TPD generated plasmons. The TPD-excited plasma waves extend to small wavelengths, above the standard Landau cut-off and interact strongly with electrons. Although a significant amount of laser energy is converted into collision-less plasma heating, the hot electron spectrum created by SRS and TPD is relatively soft, limited to energies below one hundred keV, which should not be a danger for the fuel core preheat in the SI scenario. The relationship of the simulation results with the High-FrequencyHybrid-Instability [3] are investigated.
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://ocs.ciemat.es/EPSICPP2012ABS/pdf/O4.205.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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