Shock-Augmented Ignition Approach to Laser Inertial Fusion.
Shock-Augmented Ignition Approach to Laser Inertial Fusion.
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激光惯性聚变的冲击增强点火方法。
DOI：
10.1103/physrevlett.129.195001
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发表时间：
2022
影响因子：
8.6
通讯作者：
Scott RHH
中科院分区：
文献类型：
--
作者：
Scott RHH
激波点火能够在低内爆速度下实现高增益，减少烧蚀瑞利-泰勒不稳定性的增长，这会降低传统的直接驱动。使用这种方法，驱动强冲击需要高激光功率和强度，导致驱动效率低下，并产生可以预热燃料的热电子。一个新的“冲击增强点火”脉冲形状的描述，通过预处理的烧蚀等离子体发射强冲击之前，使热核燃料的冲击点火，但重要的是，大大降低了激光功率和强度的要求。相对于冲击点火的降低的强度要求限制了激光-等离子体不稳定性，例如受激拉曼和布里渊散射，降低了热电子预热的风险并恢复了常规直接驱动的激光耦合优势。模拟表明，由于功率要求降低，在国家点火设施等现有设施的功率和能量限制范围内，大规模直接驱动内爆（外径、氘氚冰厚度）的高增益（）点火是可能的。此外，这一概念延伸到间接驱动内爆，表现出显着的产量增加，在降低内爆速度。激波增强点火扩展了激光惯性聚变的可行设计空间。
Shock ignition enables high gain at low implosion velocity, reducing ablative Rayleigh-Taylor instability growth, which can degrade conventional direct drive. With this method, driving a strong shock requires high laser power and intensity, resulting in inefficiencies in the drive and the generation of hot electrons that can preheat the fuel. A new “shock-augmented ignition” pulse shape is described that, by preconditioning the ablation plasma before launching a strong shock, enables the shock ignition of thermonuclear fuel, but importantly, with substantially reduced laser power and intensity requirements. The reduced intensity requirement with respect to shock ignition limits laser-plasma instabilities, such as stimulated Raman and Brillouin scatter, reducing the risk of hot-electron preheat and restoring the laser coupling advantages of conventional direct drive. Simulations indicate that, due to the reduced power requirements, high gain () ignition of large-scale direct drive implosions (outer radius, deuterium-tritium ice thickness) may be possible within the power and energy limits of existing facilities such as the National Ignition Facility. Moreover, this concept extends to indirect drive implosions, which exhibit substantial yield increases at reduced implosion velocity. Shock-augmented ignition expands the viable design space of laser inertial fusion.
影响因子：
2.2
作者：
R. Nora;R. Betti;K. Anderson;A. Shvydky;A. Bose;K. Woo;A. Christopherson;J. Marozas;T. Collins;P. Radha;S. X. Hu;R. Epstein;F. Marshall;R. Mccrory;T. Sangster;D. Meyerhofer
通讯作者：
R. Nora;R. Betti;K. Anderson;A. Shvydky;A. Bose;K. Woo;A. Christopherson;J. Marozas;T. Collins;P. Radha;S. X. Hu;R. Epstein;F. Marshall;R. Mccrory;T. Sangster;D. Meyerhofer
影响因子：
2.2
作者：
Montgomery, David S.
通讯作者：
Montgomery, David S.
通过间接驱动产生类似冲击点火的压力
影响因子：
2.2
作者：
W. Trickey;J. Pasley
通讯作者：
J. Pasley