Speaker
Keisuke Shigemori
Description
See the full Abstract at http://ocs.ciemat.es/EPS2018ABS/pdf/P1.2020.pdf
The role of laser-produced hot electron on ultrahigh pressure generation
K. Shigemori1, Y. Fukuyama1, T. Kawashima1, H. Kato1, N. Fujiwara1, Y. Hironaka1, S. Lee1,
T. Ueda1, H. Nagatomo1, H. Nishimura1, S. Fujioka1, K. Miyanishi1, N. Ozaki2, Y. Fujimoto2,
H. Matsumura2, T. Nishikawa2, R. Hazama2, R. Ochante2, R. Kodama1,2, T. Matsuoka3,
D. Batani4, J. Trela4, and P. Nicolai4
1
Institute of Laser Engineering, Osaka University, Japan
2
Graduate School of Engineering, Osaka University, Japan
3
Open and Transdisciplinary Research Initiatives, Osaka University, Japan
4
Centre Lasers Intenses et Applications, France
We performed an experiment on ultrahigh pressure generation with hot electrons
produced by high-intensity laser plasma interactions. Hot electrons with small temporal
duration might be ultra-high pressure source by absorption of matter within very thin layer
that is comparable to mean free path of hot electrons [1]. The ultrahigh-pressure generation
exceeding GBar regime is very important for shock ignition scheme of ICF targets, as well as
fundamental ultrahigh-pressure experiments.
Experiments were done on GEKKO-HIPER laser irradiation facility at ILE, Osaka
University. We irradiated three-layered foils (CH-Cu-Quartz) in order to generate the
ultrahigh pressure with hot electrons, and observe shock wave into the third quartz layer. The
pulse duration and the intensity were 300 ps and 1015 – 1016 W/cm2, respectively (2 or
3 light). For some data shots, we applied pre-pulse for enhancement of effects by hot
electron generation and pre-compression. We estimated laser intensity on the target with a
static x-ray pinhole camera. The absorption area by hot electrons was measured by a
Cu-Kimager. The shock wave parameters were taken by VISAR and streaked optical
pyrometer (SOP).
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