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

点击翻译按钮获取中文摘要

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.