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.

中文翻译：

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多个宽带激光器驱动的绝对两等离激元衰减阈值和受激拉曼散射不稳定性

在与惯性约束融合实验相关的条件下，使用3D模拟评估由多个宽带激光束驱动的绝对受激拉曼散射（SRS）和两等离子体衰减（TPD）不稳定性的阈值。发现多波束TPD和SRS反向散射比相应的单波束不稳定性更容易用带宽缓解。在与正在进行的国家点火设施实验相关的条件下，相对带宽为1％会使绝对SRS反向散射的阈值增加4倍，并且应该足以在类似条件下的实验中将所有绝对不稳定性保持在阈值以下。