title: Fast saturation of the two-plasmon-decay instability for shock-ignition conditions.
abstract: Two-plasmon-decay (TPD) instability is investigated for conditions relevant for the shock-ignition (SI) scheme of inertial confinement fusion. Two-dimensional particle-in-cell simulations show that in a hot, large-scale plasma, TPD develops in concomitance with stimulated Raman scattering (SRS). It is active only during the first picosecond of interaction, and then it is rapidly saturated due to plasma cavitation. TPD-excited plasma waves extend to small wavelengths, above the standard Landau cutoff. The hot electron spectrum created by SRS and TPD is relatively soft, limited to energies below 100 keV, which should not be a danger for the fuel core preheat in the SI scenario.
authors.affiliation: LULI, Université Pierre et Marie Curie, Ecole Polytechnique, CNRS, CEA, F-75252 Paris, France.
authors.forename: S
authors.initials: S
authors.lastname: Weber
authors.forename: C
authors.initials: C
authors.lastname: Riconda
authors.forename: O
authors.initials: O
authors.lastname: Klimo
authors.forename: A
authors.initials: A
authors.lastname: Héron
authors.forename: V T
authors.initials: VT
authors.lastname: Tikhonchuk