Abstract Details
Extreme material conditions on and off Hugoniot
Author: Norimasa Ozaki
Requested Type: Oral Only
Submitted: 2009-04-22 01:10:47
Co-authors: T. Sano, T. Mashimo, T. Kimura, K. Miyanishi, T. Vinci, F.H. Ree, H. Azechi, M. Ikoma, T. Endo, Y. Hironaka, Y. Hori, A. Iwamoto, T. Jitsui, T. Kadono, M. Koenig, H. Nagatomo, M. Nakai, T. Norimatsu, T. Okuchi, K. Otani, T. Sakaiya, T. Sano, T. Sekine, K. Shigemori, K. Shimizu, A. Shiroshita, A. Sunahara, H. Takahashi, and R. Kodama
Contact Info:
Graduate School of Engineering, Osaka University
2-1 Yamada-oka
Suita, Osaka 565-087
Japan
Abstract Text:
High-power laser irradiation creates extremely high pressure shock conditions (high P, ρ, and T) in material. Recent sophisticated works have been deepening the understanding of “laser-driven shock wave” [1]. We have performed Hugoniot EOS measurements for various materials based on the impedance matching method on the GEKKO/HIPER laser facility. We used a VISAR/SOP system as a shock diagnostic tool and an alpha-quartz as an EOS standard. Here, we will present new data for typical ultra-hard (high impedance) and soft (low-impedance) materials.
From direct observation of shock wave traveling into quartz, laser-driven shock wave is found not to be perfectly steady. We will discuss the difference of Hugoniot points due to this unsteady effect. In order to accurately obtain unknown material’s EOS, off-Hugoniot information of standard material, including re-shock and release isentrope, is required. For this purpose, we performed sapphire EOS measurements with using quartz base, obtaining new sapphire data in TPa (10 Mbar) pressure regime. Moreover, a novel experimental scheme will be discussed to accurately determine quartz release curve for low-density, soft materials EOS experiments.
Finally, extreme off-Hugoniot consensed matter researches (high P and ρ but low T) using high-power laser will be presented briefly, which is being developed in the Osaka University.
This work was performed under the joint research project of the ILE, Osaka University. This research was partially supported by grants for the Core-to-Core Program from the JSPS and for the Global COE Program, ``Center for Electronic Devices Innovation", from the MEXT of Japan.
Reference
[1] D.G. Hicks et al., Phys. Plasmas 12, 082702 (2005).
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