Marozas J A, Hohenberger M, Rosenberg M J, Turnbull D, Collins T J B, Radha P B, McKenty P W, Zuegel J D, Marshall F J, Regan S P, Sangster T C, Seka W, Campbell E M, Goncharov V N, Bowers M W, Di Nicola J-M G, Erbert G, MacGowan B J, Pelz L J, Yang S T
Laboratory for Laser Energetics, University of Rochester, 250 East River Road, Rochester, New York 14623-1299, USA.
Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550-9698, USA.
Phys Rev Lett. 2018 Feb 23;120(8):085001. doi: 10.1103/PhysRevLett.120.085001.
Cross-beam energy transfer (CBET) results from two-beam energy exchange via seeded stimulated Brillouin scattering, which detrimentally reduces ablation pressure and implosion velocity in direct-drive inertial confinement fusion. Mitigating CBET is demonstrated for the first time in inertial-confinement implosions at the National Ignition Facility by detuning the laser-source wavelengths (±2.3 Å UV) of the interacting beams. We show that, in polar direct-drive, wavelength detuning increases the equatorial region velocity experimentally by 16% and alters the in-flight shell morphology. These experimental observations are consistent with design predictions of radiation-hydrodynamic simulations that indicate a 10% increase in the average ablation pressure.
交叉束能量转移（CBET）是由种子受激布里渊散射引起的两束光能量交换导致的，这会不利地降低直接驱动惯性约束聚变中的烧蚀压力和内爆速度。在美国国家点火装置的惯性约束内爆中，首次通过使相互作用光束的激光源波长失谐（±2.3 Å紫外线）来减轻CBET。我们表明，在极向直接驱动中，波长失谐使赤道区域速度在实验上提高了16%，并改变了飞行中的壳层形态。这些实验观测结果与辐射流体动力学模拟的设计预测一致，该模拟表明平均烧蚀压力提高了10%。
