Ultra high-speed x-ray imaging of laser-driven shock compression using synchrotron light

作者：Olbinado Margie P^*; Cantelli Valentina; Mathon Olivier; Pascarelli Sakura; Grenzer Joerg^*; Pelka Alexander; Roedel Melanie; Prencipe Irene; Garcia Alejandro Laso; Helbig Uwe; Kraus Dominik; Schramm Ulrich; Cowan Tom; Scheel Mario; Pradel Pierre; De Resseguier Thibaut; Rack Alexander^*

来源：Journal of Physics D: Applied Physics , 2018, 51(5): 055601.

DOI：10.1088/1361-6463/aaa2f2

• laser shock
• ultra high-speed imaging
• synchrotron radiation
• x-ray phase-contrast imaging
• polyurethane foam
• graphite

A high-power, nanosecond pulsed laser impacting the surface of a material can generate an ablation plasma that drives a shock wave into it; while in situ x-ray imaging can provide a time-resolved probe of the shock-induced material behaviour on macroscopic length scales. Here, we report on an investigation into laser-driven shock compression of a polyurethane foam and a graphite rod by means of single-pulse synchrotron x-ray phase-contrast imaging with MHz frame rate. A 6 J, 10 ns pulsed laser was used to generate shock compression. Physical processes governing the laser-induced dynamic response such as elastic compression, compaction, pore collapse, fracture, and fragmentation have been imaged; and the advantage of exploiting the partial spatial coherence of a synchrotron source for studying low-density, carbon-based materials is emphasized. The successful combination of a high-energy laser and ultra high-speed x-ray imaging using synchrotron light demonstrates the potentiality of accessing complementary information from scientific studies of laser-driven shock compression.

• 出版日期2018-2-7