The double-cone ignition (DCI) scheme has been proposed as one of the alternative approaches to inertial confinement fusion, based on direct-drive and fast-ignition, in order to reduce the requirement for the driver energy. To evaluate the conical implosion energetics from the laser beams to the plasma flows, a series of experiments have been systematically conducted. The results indicate that $89\%–96\%$ of the laser energy was absorbed by the target, with moderate stimulated Raman scatterings. Here $2\%–6\%$ of the laser energy was coupled into the plasma jets ejected from the cone tips, which was mainly restricted by the mass reductions during the implosions inside the cones. The supersonic dense jets with a Mach number of 4 were obtained, which is favorable for forming a high-density, nondegenerated plasma core after the head-on collisions. These findings show encouraging results in terms of energy transport of the conical implosions in the DCI scheme.

中文翻译：

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圆锥形内爆过程中的高效能量传输

双锥点火（DCI）方案已被提出作为惯性约束聚变的替代方法之一，基于直接驱动和快速点火，以减少对驱动器能量的需求。为了评估从激光束到等离子体流的锥形内爆能量，系统地进行了一系列实验。结果表明$89\%–96\%$的激光能量被目标吸收，并产生适度的受激拉曼散射。这里$2\%–6\%$激光能量耦合到从锥体尖端喷射的等离子体射流中，这主要受到锥体内内爆过程中质量减少的限制。获得了马赫数为4的超音速致密射流，有利于正面碰撞后形成高密度、非简并等离子体核心。这些发现显示了 DCI 方案中圆锥内爆能量传输方面令人鼓舞的结果。