Multi-frame x-ray radiography and image tracking for quantification of expansion in laser-driven tin ejecta microjets

• Published in: Review of scientific instruments 2024-12, Vol.95 (12)
• Main Authors: Sun, Yuchen, Hammons, Joshua, Champion, Daniel, Das, Pinaki, Gunawidjaja, Ray, Li, Yuelin, Schuman, Adam, Sinclair, Nicholas, Toyoda, Yoshimasa, Willey, Trevor, Saunders, Alison M., Eggert, Jon H., Pino, Jesse
• Format: Article
• Language: English
• Subjects: Algorithms; Cross correlation; Ejecta; Particle interactions; Radiography; Synchrotron radiation; Tracking; X ray imagery; X ray sources; X-ray radiography
• ISSN: 0034-6748; 1089-7623; 1089-7623
• DOI: 10.1063/5.0238425

One regime of experimental particle-laden flow study involves ejecta microjets—often defined as a stream of micrometer-scale particles generated through shock interaction with a non-uniform surface and generally travel above 1 km/s. In order to capture the change in characteristics as a function of propagation time, we apply a multi-frame x-ray radiography platform to observe and track the jet transport dynamics. A synchrotron x-ray source allows us to perform quantitative analyses and comparisons between the eight images captured by the imaging system. Observation of a single jet through time allows the use of a cross correlation algorithm to independently track various regions within the jet and quantify the jet expansion over time using normalized area and normalized areal density values. Through a comparison with the calculated values of ballistic transport, these findings show less expansion than expected for ballistically transporting particles. This work combines multi-frame synchrotron radiography with image tracking to establish a foundation for future studies on jet transport and particle interaction dynamics.