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首页> 外文会议>High-Power Laser Ablation VI pt.1 >Gold wall ablation and hohlraum filling measurements of vacuum and gas-filled hohlraums
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Gold wall ablation and hohlraum filling measurements of vacuum and gas-filled hohlraums

机译：真空和充气式金刚砂的金壁消融和金刚砂填充测量

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An understanding of the timing and dynamics of hohlraum filling by laser-induced gold wall ablation is critical to the performance of indirectly-driven fusion ignition designs for the National Ignition Facility [E. Moses and C. Wuest, Fusion Science and Technology, 43, 420 (2003)]. Hohlraum wall ablation negatively affects ignition hohlraum performance by (1) reducing laser coupling by increasing backscatter by laser plasma instabilities, e.g., stimulated Brillouin scattering, (2) altering where lasers couple by moving the critical surface away from the walls and changing the refractive index, and (3), in the case of vacuum hohlraums, ablating directly into contact with the ablation layer of the fuel capsule. We report on measurements of gold-filling of hohlraums from a series of OMEGA laser [T.R. Boehly, R.L. McCrory, C.P. Verdon et al., Fusion Engineering and Design, 44, 35 (1999)] experiments involving vacuum and gas-filled hohlraums. On-axis x-ray imaging of gold self-emission shows delayed filling for gas-filled hohlraums, as expected. In addition, we present data on the hohlraum temperature penalty incurred with the use of a 1-atmosphere methane-fill. We discuss data and simulation predictions for 1-atmosphere neopentane filled hohlraums driven with a modified laser pulse.
机译：激光诱导的金壁烧蚀对大孔填充时间和动力学的理解对于国家点火设施的间接驱动聚变点火设计的性能至关重要[E. Moses和C. Wuest，《融合科学与技术》，43，420（2003）。孔壁烧蚀通过（1）通过激光等离子不稳定性（例如，受激的布里渊散射）增加反向散射来减少激光耦合，从而对点火孔的性能产生负面影响；（2）通过将关键表面移离壁并改变折射率来改变激光的耦合位置（3）在真空打气筒的情况下，直接烧蚀以与燃料盒的烧蚀层接触。我们报告了一系列OMEGA激光[T.R. Boehly，R.L. McCrory，C.P. Verdon et al。，Fusion Engineering and Design，44，35（1999）]涉及真空和气体充填法的实验。如预期的那样，金自发射的X射线轴心成像显示充气透孔的填充延迟。此外，我们还提供了使用1-大气压甲烷填充物引起的高温温度损失的数据。我们讨论了用修改后的激光脉冲驱动的1-大气新戊烷填充的液体的数据和模拟预测。

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