Igumenshchev I V, Theobald W, Stoeckl C, Shah R C, Bishel D T, Goncharov V N, Bonino M J, Campbell E M, Ceurvorst L, Chin D A, Collins T J B, Fess S, Harding D R, Sampat S, Shaffer N R, Shvydky A, Smith E A, Trickey W T, Waxer L J, Colaïtis A, Liotard R, Adrian P J, Atzeni S, Barbato F, Savino L, Alfonso N, Haid A, Do Mi
Laboratory for Laser Energetics, 250 East River Road, Rochester, New York 14623-1212, USA.
Centre Lasers Intenses et Applications, UMR 5107, 351 Cours de la libération, 33400 Talence, France.
Phys Rev Lett. 2023 Jul 7;131(1):015102. doi: 10.1103/PhysRevLett.131.015102.
In the dynamic-shell (DS) concept [V. N. Goncharov et al., Novel Hot-Spot Ignition Designs for Inertial Confinement Fusion with Liquid-Deuterium-Tritium Spheres, Phys. Rev. Lett. 125, 065001 (2020).PRLTAO0031-900710.1103/PhysRevLett.125.065001] for laser-driven inertial confinement fusion the deuterium-tritium fuel is initially in the form of a homogeneous liquid inside a wetted-foam spherical shell. This fuel is ignited using a conventional implosion, which is preceded by a initial compression of the fuel followed by its expansion and dynamic formation of a high-density fuel shell with a low-density interior. This Letter reports on a scaled-down, proof-of-principle experiment on the OMEGA laser demonstrating, for the first time, the feasibility of DS formation. A shell is formed by convergent shocks launched by laser pulses at the edge of a plasma sphere, with the plasma itself formed as a result of laser-driven compression and relaxation of a surrogate plastic-foam ball target. Three x-ray diagnostics, namely, 1D spatially resolved self-emission streaked imaging, 2D self-emission framed imaging, and backlighting radiography, have shown good agreement with the predicted evolution of the DS and its stability to low Legendre mode perturbations introduced by laser irradiation and target asymmetries.
在用于激光驱动惯性约束聚变的动态壳层（DS）概念[V. N. 贡恰罗夫等人，《用于含液态氘 - 氚球的惯性约束聚变的新型热点点火设计》，《物理评论快报》125卷，065001（2020年）。PRLTAO0031 - 900710.1103/PhysRevLett.125.065001]中，氘 - 氚燃料最初以均匀液体的形式存在于浸湿泡沫的球壳内部。这种燃料通过传统内爆点火，在此之前先对燃料进行初始压缩，然后使其膨胀，并动态形成一个内部低密度的高密度燃料壳层。本信函报道了在欧米茄激光器上进行的一个按比例缩小的原理验证实验，首次证明了形成DS的可行性。一个壳层由激光脉冲在等离子体球边缘引发的汇聚激波形成，而等离子体本身是由激光驱动对替代塑料泡沫球靶进行压缩和弛豫后形成的。三种X射线诊断方法，即一维空间分辨自发射条纹成像、二维自发射分幅成像和背光照相，已显示出与预测的DS演化及其对激光辐照和靶不对称性引入的低勒让德模式扰动的稳定性有良好的一致性。
