A new class of ignition designs is proposed for inertial confinement fusion experiments. These designs are based on the hot-spot ignition approach, but instead of a conventional target that is comprised of a spherical shell with a thin frozen deuterium-tritium (DT) layer, a liquid DT sphere inside a wetted-foam shell is used, and the lower-density central region and higher-density shell are created dynamically by appropriately shaping the laser pulse. These offer several advantages, including simplicity in target production (suitable for mass production for inertial fusion energy), absence of the fill tube (leading to a more-symmetric implosion), and lower sensitivity to both laser imprint and physics uncertainty in shock interaction with the ice-vapor interface. The design evolution starts by launching an $\sim 1$-Mbar shock into a DT sphere. After bouncing from the center, the reflected shock reaches the outer surface of the sphere and the shocked material starts to expand outward. Supporting ablation pressure ultimately stops such expansion and subsequently launches a shock toward the target center, compressing the ablator and fuel, and forming a shell. The shell is then accelerated and fuel is compressed by appropriately shaping the drive laser pulse, forming a hot spot using the conventional or shock ignition approaches. This Letter demonstrates the feasibility of the new concept using hydrodynamic simulations and discusses the advantages and disadvantages of the concept compared with more-traditional inertial confinement fusion designs.

中文翻译：

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液-氘-rit球惯性约束融合的新型热点点火设计。

提出了一种新型的点火设计，用于惯性约束融合实验。这些设计基于热点点火方法，但是代替了传统的目标，即由带有薄层冷冻氘-（DT）层的球形外壳组成，而是在湿泡沫外壳内部使用了液体DT球形，通过适当地整形激光脉冲来动态地创建低密度中心区域和高密度壳。这些具有许多优点，包括目标生产的简单性（适合于惯性聚变能量的批量生产），没有填充管（导致更对称的内爆）以及在与激光打交道时对激光压印和物理不确定性的敏感性较低。冰汽界面。设计的演变始于启动$〜\mathrm{1个}$-Mbar冲击进入DT球体。从中心弹起后，反射的震动到达球体的外表面，并且震动的材料开始向外扩展。支撑消融压力最终会停止这种膨胀，并随后向目标中心发出冲击，压缩消融器和燃料，并形成壳体。然后，通过适当成形驱动激光脉冲来加速外壳并压缩燃料，从而使用常规点火方法或冲击点火方法形成热点。这封信通过流体动力学仿真论证了新概念的可行性，并讨论了与更传统的惯性约束聚变设计相比，该概念的优缺点。