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(IFP/15(R)) Experimental Studies on Hydrodynamic Instability of Direct-Drive Laser Fusion on GEKKO XII

M. Nakai1), H. Azechi1), N. Izumi1), R. Kodama1), O. Maegawa1), M. Matsuoka1), K. Mima1), N. Miyanaga1), T. Nagaya1), S. Nakai1), M. Nakatsuka1), K. Nishihara1), M. Nishikino1), H. Nishimura1), T. Norimatsu1), K. Shigemori1), H. Shiraga1), A. Sunahara1), H. Takabe1), T. Yamanaka1), C. Yamanaka2)
 
1) Institute of Laser Engineering, Osaka University, Osaka, JAPAN
2) Institute for Laser Technology, Osaka, JAPAN

Abstract.  A series of elementary experiments on the hydrodynamic instability has been conducted at the GEKKO XII laser system to investigate hydrodynamic instability growth in planar foils directly irradiated by 0.53- $ \mu$m laser light. The dynamic property of laser initial imprint was successfully obtained by the improved two-wavelength Young's interference method. Two types of the ``indirect/direct hybrid'' schemes were also examined to quantify the effective mitigation of laser initial imprint. Especially, a multi-density foam layer was utilized for the first time to demonstrate the feasibility of the density varying target. Rayleigh-Taylor instability growth rate on the directly driven target around its maximum was also measured with the perturbation wavelengths less than 10 $ \mu$m by a newly developed technique of x-ray moiré interferometry.

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IAEA 2001