Inertial Fusion Sciences and Applications 2005
J.-C. Gauthier, et al.
J. Phys. IV France 133 (2006) 301-303
DOI: 10.1051/jp4:2006133059

Hot electron velocity distribution in ultra-short laser produced plasma diagnosed with X-ray polarization spectroscopy

Y. Inubushi¹, H. Nishimura¹, M. Ochiai¹, S. Fujioka¹, T. Kai¹, T. Kawamura², S. Nakazaki³, S. Sakabe⁴ and K. Mima<sup>1

1</sup>  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

Abstract
Polarization degree of helium-like Cl-He line (1s^{2 1}S₀ - 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.

© EDP Sciences 2006