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Multiple shock compression of diamond foils with a shaped laser pulse over 1 TPa
K. Shigemori (Institute of Laser Engineering, The University of Osaka), Katsuya Shimizu (The University of Osaka), Yuki Nakamoto (The University of Osaka), Tetsuo Irifune (Ehime University, Geodynamics Research Center, Ehime University), Hitoshi Sumiya (Sumitomo Electric Industries (Japan)), Norimasa Ozaki (The University of Osaka), R. Kodama (The University of Osaka), K. Otani (Institute of Laser Engineering, The University of Osaka), D. Ichinose (Institute of Laser Engineering, The University of Osaka), Yoichiro Hironaka (Institute of Laser Engineering, The University of Osaka), Toshihiko Kadono (Institute of Laser Engineering, The University of Osaka), H. Azechi (Institute of Laser Engineering, The University of Osaka), K. Mima (Institute of Laser Engineering, The University of Osaka), Justin S. Wark (University of Oxford), Bruce A. Remington (Lawrence Livermore National Laboratory)
Abstract: Experiments on shock compression of diamond foils with intense laser are reported. In order to explore high-pressure and low-temperature region of the carbon phase-diagram, we irradiate single-crystal (Type-Ib) crystal foils with a shaped (ramp) pulse at the pressure of over 1TPa. We observed time-resolved reflectivity from the rear surface of the diamond during the shock compression with velocity interferometer system for any reflector (VISAR). Simultaneous observation of optical measurements and x-ray diffraction has been tested. Preliminary results on decompression of the diamond crystal due to x-ray heating were observed.