Microscale radiography of complex hydrodynamics phenomena in high-density laser plasma

在2022财年，我们在SACLA XFEL（BL3）的高能量密度平台上进行了相位对比成像（PCI）实验。我们的PCI方法进一步升级。现在放射照相方案在多成像采集制度下运作。物体的图像被记录在从物体到探测器的三个不同距离。在每个距离上，PCI效应都针对物体的特定吸收和散射特性进行优化。这一改进提高了射线照相在密度变化范围内的质量和信息量，并提高了密度测量的准确性。通过这种方法，我们研究了在高达几毫巴的压力下形成的高能激光诱导激波的复杂形态，这些激波是用于状态方程（EOS）和天体物理相关任务（阿尔法石英，z切割石英，熔融石英，铝，硅酸镁Mg2SiO4， MgSiO2玻璃陶瓷）的精确测定参数感兴趣的许多晶体和非晶态材料。我们继续研究了金刚石中的冲击诱发现象，特别是滑移破坏机制。在三种不同取向的晶体金刚石中，研究了<100>,<110>和<111>的冲击缺陷对塑性的影响。在理论和仿真方面，利用光滑粒子流体力学代码对金刚石中弹塑性激波劈裂的动力学进行了二维建模，得到了令人印象深刻的匹配。建立了基于衍射的激波上升锋宽度测量模型。

During 2022 FY year we performed phase-contrast imaging (PCI) experiments at High Energy Density platform of SACLA XFEL(BL3) in the frames of 4 accepted proposal. Our the PCI method was further upgraded. Now the radiographic scheme operates in multi-imaging acquisition regime. The images of the object are recorded at three different distances from the object to detectors. At every distance the PCI effect is optimized for the specific absorption and scattering properties of the object. That improvement allowed to advance the quality and informative of radiography in the wide range of density variations and to increase the accuracy of density measurements.By this method, we studied the complicated morphology of the high-energy-laser-induced shocks formed under pressure up to a few Mbar for numerous crystalline and amorphous materials of interest of precise determination parameters for equations of state (EOS) and for astrophysics related tasks (alfa-quartz, z-cut quartz, fused silica, Al, magnesium silicate Mg2SiO4, MgSiO2 glass ceramic).We continued investigation of shock induced phenomena in diamond, in particular, the slip failure mechanism. In crystalline diamonds with three different orientations <100>, <110>, and <111> were examined on the difference in plasticity mediated by shock-induced defects.In theory and simulations, for dynamic of elastic-plastic shock waves splitting in diamond the impressive matching obtained by 2D modeling using Smoothed Particle Hydrodynamics code. Developed the diffraction based model for measuring width of rising front in shock waves.