Brown Shaughnessy Brennan, Hashim Akel, Gleason Arianna, Galtier Eric, Nam Inhyuk, Xing Zhou, Fry Alan, MacKinnon Andy, Nagler Bob, Granados Eduardo, Lee Hae Ja
Department of Mechanical Engineering, Stanford University, Stanford, California 94305, USA.
SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA.
Rev Sci Instrum. 2017 Oct;88(10):105113. doi: 10.1063/1.4997756.
We measure the shock drive capabilities of a 30 J, nanosecond, 527 nm laser system at the matter in extreme conditions hutch of the Linac Coherent Light Source. Using a velocity interferometer system for any reflector, we ascertain the maximum instantaneous ablation pressure and characterize its dependence on a drive laser spot size, spatial profile, and temporal profile. We also examine the effects of these parameters on shock spatial and temporal uniformity. Our analysis shows the drive laser capable of generating instantaneous ablation pressures exceeding 160 GPa while maintaining a 1D shock profile. We find that slope pulses provide higher instantaneous ablation pressures than plateau pulses. Our results show instantaneous ablation pressures comparable to those measured at the Omega Laser Facility in Rochester, NY under similar optical drive parameters. Finally, we analyze how optical laser ablation pressures are compare with known scaling relations, accounting for variable laser wavelengths.
我们在直线加速器相干光源的极端条件实验室内，测量了一台30焦耳、纳秒级、527纳米激光系统的冲击驱动能力。使用用于任意反射器的速度干涉仪系统，我们确定了最大瞬时烧蚀压力，并表征了其对驱动激光光斑尺寸、空间分布和时间分布的依赖性。我们还研究了这些参数对冲击空间和时间均匀性的影响。我们的分析表明，该驱动激光能够产生超过160吉帕的瞬时烧蚀压力，同时保持一维冲击分布。我们发现斜坡脉冲比平台脉冲提供更高的瞬时烧蚀压力。我们的结果表明，在类似的光学驱动参数下，瞬时烧蚀压力与在纽约罗切斯特的欧米茄激光装置上测得的压力相当。最后，我们分析了光学激光烧蚀压力与已知比例关系的比较情况，同时考虑了可变的激光波长。
