Producing shock-ignition-like pressures by indirect drive
Producing shock-ignition-like pressures by indirect drive
复制标题
通过间接驱动产生类似冲击点火的压力
DOI：
--
复制
发表时间：
2019
影响因子：
2.2
通讯作者：
J. Pasley
中科院分区：
文献类型：
--
作者：
W. Trickey;J. Pasley
激波点火方案是一种可供选择的惯性约束聚变点火方案，它提供了更高的增益和对流体动力学不稳定性的鲁棒性。冲击点火的一个理想方面是，所需的强度是在现有的设施上可以实现的。传统的冲击点火方法只考虑使用直接激光驱动。这部分是由于担心使用间接驱动方法实现最终压力峰值中所需的驱动压力的快速上升可能不可行。能够利用黑腔驱动器进行冲击点火实验的主要优点是，实验可以在现有的或即将完成的兆焦耳规模的设施中进行。此外，这可以在不需要对设施结构进行任何重大修改的情况下完成，例如直接驱动实验所需的修改。使用代码HYADES和h2 d进行了一维和二维辐射流体动力学模拟。这些模拟研究了能够产生冲击点火刻度压力的X射线通量水平，以及在NIF刻度-1黑腔中产生这些压力所需的激光功率。这项工作的第二个方面是调查X射线通量上升时间，这将是必要的，以创建一个足够大的冲击点火尖峰压力（200- 300毫巴）。发现通过使用峰值功率为400 TW的激光源的间接驱动可以实现230 Mbar的压力。此外，最终压力峰值中的压力增加速率与直接驱动冲击点火的预期要求相似。
The shock ignition scheme is an alternative Inertial Confinement Fusion ignition scheme that offers higher gains and a robustness to hydrodynamic instabilities. A desirable aspect of shock ignition is that the required intensities are achievable on existing facilities. Conventional approaches to shock ignition have only considered the use of direct laser drive. This is in part due to concerns that achieving the rapid rise in drive pressure needed in the final pressure spike may not be feasible using the indirect drive approach. The primary advantage of being able to utilise a hohlraum drive for a shock ignition experiment is that experiments could be carried out at existing, or soon to be completed, Mega-Joule scale facilities. Furthermore, this could be done without the need for any major modification to the facility architecture, such as would be required for direct drive experiments. One and two-dimensional radiation hydrodynamic simulations have been performed using the codes HYADES and h2d. The simulations investigated the level of x-ray fluxes that could produce shock ignition scale pressures as well as the laser powers that would be required to generate those pressures in a NIF scale-1 hohlraum. The second aspect of this work was to investigate the x-ray flux rise times that would be necessary to create a large enough shock ignition spike pressure (200– 300 Mbar ). It was found that pressures of 230 Mbar could be achieved through indirect drive using a laser source with a peak power of 400 TW . In addition, the rate of pressure increase in the final pressure spike is similar to the expected requirements for directly-driven shock ignition.
通过快速电子能量沉积产生强冲击波
影响因子：
2.2
作者：
Fox T
通讯作者：
Fox T