Return To: Session IFP - Inertial Fusion
Prev Page: (IFP/14(R)) The GEKKO XII-HIPER (High Intensity Plasma Experimental
Next Page: (IFP/16(R)) Nonlinear Theory of Laser Imprint, Richtmyer-Meshkov and

(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. Yamanaka^2)
 
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.

Read the full paper in PDF format.