Abstract
This article discusses the factors influencing the yields of molybdenum Kα radiations from a pulsed-power driven needle-and-blade diode for the application of real-time x-ray diffraction of shocked solids. Based on our 300 kV/10 kA pulsed power stand, electrical properties (diode voltage, current and deposited energy) and energy spectrum were evaluated under different diode configurations. It is found that the diode voltage plays an important role in the production of Kα radiation. A large emission angle was beneficial for obtaining higher Kα photon yields and the deposited power on diode could be generally used to predict the Kα radiation. These results are helpful to guide the development of pulsed power diode for dynamic x-ray diffraction applications.
Highlights
Real-time x-ray diffraction of shocked solids can provide insight into the lattice-scale level of mechanisms relating to phase transformation, elastic-plastic deformation, and equation of state
Laser-plasma-based x-ray sources, synchrotron x-ray sources and flash x-ray sources are all being used in dynamic x-ray diffraction (DXRD)
The Mo Kα radiation of the needle-and-blade diode has been investigated via Monte Carlo (MC) modeling, measurements and analysis of electrical properties, energy spectrum and initial purity based on our 300 kV/10 kA pulsed power stand
Summary
Real-time x-ray diffraction of shocked solids can provide insight into the lattice-scale level of mechanisms relating to phase transformation, elastic-plastic deformation, and equation of state. Laser-plasma-based x-ray sources, synchrotron x-ray sources and flash x-ray sources are all being used in dynamic x-ray diffraction (DXRD). The first two approaches have met most of the applications but the availability is limited, while flash x-ray diode driven by power pulsed generator is more affordable. Since the pioneering work by Johnson et al., a lot of efforts has been spent on improving Kα yields of flash x-ray sources. Unclear optimal diode operating parameters in the former investigation have made the acquisition of high quality DXRD signal. Acquiring high quality results in quantitative measurements of high quality DXRD signal is difficult
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