Thresholds of absolute two-plasmon-decay and stimulated Raman scattering instabilities driven by multiple broadband lasers
R. K. Follett, J. G. Shaw, J. F. Myatt, Han Wen, D. H. Froula, J. P. Palastro
Abstract
Thresholds for the absolute stimulated Raman scattering (SRS) and two-plasma decay (TPD) instabilities driven by multiple broadband laser beams are evaluated using 3D simulations at conditions relevant to inertial confinement fusion experiments. Multibeam TPD and SRS backscatter are found to be easier to mitigate with bandwidth than the corresponding single-beam instabilities. A relative bandwidth of 1% increases the threshold for absolute SRS backscatter by a factor of 4 at conditions relevant to ongoing National Ignition Facility experiments and should be sufficient to keep all of the absolute instabilities below threshold in experiments with similar conditions.
Topics & Concepts
PhysicsNational Ignition FacilityInertial confinement fusionBackscatter (email)LaserBandwidth (computing)OpticsPlasmaRaman scatteringScatteringAtomic physicsBroadbandRaman spectroscopyComputational physicsNuclear physicsTelecommunicationsComputer scienceComputer networkWirelessLaser-Plasma Interactions and DiagnosticsLaser-induced spectroscopy and plasmaLaser-Matter Interactions and Applications