Patel D, Knauer J P, Cao D, Betti R, Nora R, Shvydky A, Gopalaswamy V, Lees A, Sampat S, Donaldson W R, Regan S P, Stoeckl C, Forrest C J, Glebov V Yu, Harding D R, Bonino M J, Janezic R T, Wasilewski D, Fella C, Shuldberg C, Murray J, Guzman D, Serrato B
Laboratory for Laser Energetics, University of Rochester, New York 14623, USA.
Department of Mechanical Engineering, University of Rochester, New York 14623, USA.
Phys Rev Lett. 2023 Sep 8;131(10):105101. doi: 10.1103/PhysRevLett.131.105101.
In direct-drive inertial confinement fusion, the laser bandwidth reduces the laser imprinting seed of hydrodynamic instabilities. The impact of varying bandwidth on the performance of direct-drive DT-layered implosions was studied in targets with different hydrodynamic stability properties. The stability was controlled by changing the shell adiabat from (α_{F}≃5) (more stable) to (α_{F}≃3.5) (less stable). These experiments show that the performance of lower adiabat implosions improves considerably as the bandwidth is raised indicating that further bandwidth increases, beyond the current capabilities of OMEGA, would be greatly beneficial. These results suggest that the future generation of ultra-broadband lasers could enable achieving high convergence and possibly high gains in direct drive ICF.
在直接驱动惯性约束聚变中，激光带宽可降低流体动力学不稳定性的激光印记种子。在具有不同流体动力学稳定性特性的靶中，研究了变化带宽对直接驱动氘 - 氚层状内爆性能的影响。通过将壳绝热线从（α_F≃5）（更稳定）改变为（α_F≃3.5）（较不稳定）来控制稳定性。这些实验表明，随着带宽增加，较低绝热线内爆的性能显著改善，这表明超出当前欧米伽（OMEGA）能力的进一步带宽增加将非常有益。这些结果表明，下一代超宽带激光器能够在直接驱动惯性约束聚变中实现高压缩比并可能实现高增益。
