Casey D T, Milovich J L, Smalyuk V A, Clark D S, Robey H F, Pak A, MacPhee A G, Baker K L, Weber C R, Ma T, Park H-S, Döppner T, Callahan D A, Haan S W, Patel P K, Peterson J L, Hoover D, Nikroo A, Yeamans C B, Merrill F E, Volegov P L, Fittinghoff D N, Grim G P, Edwards M J, Landen O L, Lafortune K N, MacGowan B J, Widmayer C C, Sayre D B, Hatarik R, Bond E J, Nagel S R, Benedetti L R, Izumi N, Khan S, Bachmann B, Spears B K, Cerjan C J, Gatu Johnson M, Frenje J A
Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
General Atomics, San Diego, California 92121, USA.
Phys Rev Lett. 2015 Sep 4;115(10):105001. doi: 10.1103/PhysRevLett.115.105001. Epub 2015 Sep 1.
Hydrodynamic instabilities can cause capsule defects and other perturbations to grow and degrade implosion performance in ignition experiments at the National Ignition Facility (NIF). Here, we show the first experimental demonstration that a strong unsupported first shock in indirect drive implosions at the NIF reduces ablation front instability growth leading to a 3 to 10 times higher yield with fuel ρR>1 g/cm(2). This work shows the importance of ablation front instability growth during the National Ignition Campaign and may provide a path to improved performance at the high compression necessary for ignition.
流体动力学不稳定性会导致胶囊缺陷以及其他扰动的增长，并降低国家点火装置（NIF）点火实验中的内爆性能。在此，我们首次通过实验证明，NIF间接驱动内爆中强烈的无支撑首次激波会减少烧蚀前沿不稳定性的增长，从而使燃料ρR>1 g/cm²时的产额提高3至10倍。这项工作表明了国家点火行动期间烧蚀前沿不稳定性增长的重要性，并可能为在点火所需的高压缩条件下提高性能提供一条途径。
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