J.-C. Gauthier, et al.
J. Phys. IV France 133 (2006) 301-303
Hot electron velocity distribution in ultra-short laser produced plasma diagnosed with X-ray polarization spectroscopyY. Inubushi1, H. Nishimura1, M. Ochiai1, S. Fujioka1, T. Kai1, T. Kawamura2, S. Nakazaki3, S. Sakabe4 and K. Mima1
1 Institute of Laser Engineering, Osaka University, 2-6 Yamada-oka, Suita, Osaka 565-0871, Japan
2 Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori, Yokohama, Kanagawa 226-8502, Japan
3 Department of Applied Physics, Faculty of Engineering, University of Miyazaki, Miyazaki 889-2192, Japan
4 Institute for Chemical Research, Kyoto University, Gokasho Uji, Kyoto 611-0011, Japan
Polarization degree of helium-like Cl-He line (1s2 1S0 - 1s2p 1P1) from a chrolinated triple-layer target was measured using a 130 fs laser pulse at 1017 W/cm2. The polarization degree was given as a function of overcoat thickness. It was found that the emission from a layer closer to the target surface is polarized parallel to the surface direction whereas emission from a deeper region in perpendicular to the surface. The experimental result was analyzed using a two dimensional (2D) Maxwellian distribution function for hot electrons. Beam-like distribution was found in the depth of plasma.
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