We present in situ measurements of spectrally resolved X-ray scattering and X-ray diffraction from monocrystalline diamond samples heatedwith an intense pulse of heavy ions.In this way,we determine the samples’heatin...We present in situ measurements of spectrally resolved X-ray scattering and X-ray diffraction from monocrystalline diamond samples heatedwith an intense pulse of heavy ions.In this way,we determine the samples’heating dynamics and their microscopic and macroscopic structuralintegrity over a timespan of several microseconds.Connecting the ratio of elastic to inelastic scattering with state-of-the-art density functionaltheory molecular dynamics simulations allows the inference of average temperatures around 1300 K,in agreement with predictions fromstopping power calculations.The simultaneous diffraction measurements show no hints of any volumetric graphitization of the material,butdo indicate the onset of fracture in the diamond sample.Our experiments pave the way for future studies at the Facility for Antiproton andIon Research,where a substantially increased intensity of the heavy ion beam will be available.展开更多
Small-angle X-ray scattering(SAXS)has been widely used as a microstructure characterization technology.In this work,a fully connected dense forward network is applied to inversely retrieve the mean particle size and p...Small-angle X-ray scattering(SAXS)has been widely used as a microstructure characterization technology.In this work,a fully connected dense forward network is applied to inversely retrieve the mean particle size and particle distribution from SAXS data of samples dynamically compressed with high-power lasers and probed with X-ray free electron lasers.The trained network allows automatic acquisition of microstructure information,performing well in predictions on single-species nanoparticles on the theoretical model and in situ experimental data.We evaluate our network by comparing it with other methods,revealing its reliability and efficiency in dynamic experiments,which is of great value for in situ characterization of materials under high-power laser-driven dynamic compression.展开更多
基金support by the Federal Ministry of Education and Research(BMBF)under Grant No.05P21RFFA2supported by the Helmholtz Association under Grant No.ERC-RA-0041.
文摘We present in situ measurements of spectrally resolved X-ray scattering and X-ray diffraction from monocrystalline diamond samples heatedwith an intense pulse of heavy ions.In this way,we determine the samples’heating dynamics and their microscopic and macroscopic structuralintegrity over a timespan of several microseconds.Connecting the ratio of elastic to inelastic scattering with state-of-the-art density functionaltheory molecular dynamics simulations allows the inference of average temperatures around 1300 K,in agreement with predictions fromstopping power calculations.The simultaneous diffraction measurements show no hints of any volumetric graphitization of the material,butdo indicate the onset of fracture in the diamond sample.Our experiments pave the way for future studies at the Facility for Antiproton andIon Research,where a substantially increased intensity of the heavy ion beam will be available.
基金supported by the Helmholtz Association under VH-NG-1141 and ERC-RA-0041.Z.H.acknowledgessupport from the National Natural Science Foundation of China under Grant No.12304033the financial support from China Scholarship Council。
文摘Small-angle X-ray scattering(SAXS)has been widely used as a microstructure characterization technology.In this work,a fully connected dense forward network is applied to inversely retrieve the mean particle size and particle distribution from SAXS data of samples dynamically compressed with high-power lasers and probed with X-ray free electron lasers.The trained network allows automatic acquisition of microstructure information,performing well in predictions on single-species nanoparticles on the theoretical model and in situ experimental data.We evaluate our network by comparing it with other methods,revealing its reliability and efficiency in dynamic experiments,which is of great value for in situ characterization of materials under high-power laser-driven dynamic compression.
