J. Phys. IV France
Volume 133, June 2006
Page(s) 985 - 988
Publié en ligne 16 juin 2006
Inertial Fusion Sciences and Applications 2005
J.-C. Gauthier, et al.
J. Phys. IV France 133 (2006) 985-988

DOI: 10.1051/jp4:2006133198

Optimization of plasma uniformity in laser-irradiated underdense targets

M.S. Tillack1, K.L. Sequoia1, J. O'Shay1, C.A. Back2 and H.A. Scott3

1  University of California San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0438, USA
2  General Atomics, PO Box 85608, San Diego, CA 92186-5608, USA
3  Lawrence Livermore National Laboratory, PO Box 808, Livermore, CA 94561, USA

We used the Hyades [1] and Helios [2] radiation-hydrodynamic simulation tools, and the Cretin atomic kinetics code [3] to model low-density SiO2 aerogel carriers doped with trace amounts of Ti and subjected to high-energy pulsed laser irradiation. Underdense targets are expected to respond to laser irradiation more uniformly as compared with solid targets, and therefore provide a better platform upon which to perform measurements of the properties of warm dense matter. We report modeling results for several cases of interest, with laser intensities in the range of $5\times 10^{12}$- $6\times 10^{13}\,{\rm W/cm}^{2}$, SiO2 densities in the range of 2-8 mg/cm3 and Ti doping in the range of 0-6%. Recommendations are given for the conditions under which relatively uniform temperature and density can be obtained.

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