J.-C. Gauthier, et al.
J. Phys. IV France 133 (2006) 939-941
Measurements of X-ray spectral opacity of dense plasma at ISKRA-5 laser facilityV.I. Annenkov, S.A. Bel'kov, A.V. Bessarab, S.V. Bondarenko, R.V. Garanin, G.G. Kochemasov, V.P. Kovalenko, A.V. Pinegin, N.A. Suslov and N.V. Zhidkov
Russian Federal Nuclear Centre - VNIIEF, 607190 Sarov, Russia
Powerful iodine ISKRA-5 laser facility was upgraded and now operates on the second harmonic. Experiments were performed to measure the x-ray spectral opacity of dense plasma of different materials. Sample of material under study was fabricated as a thin plate with the 0.1-0.15 m thickness and was heated by the soft x-rays generated by irradiation of a thin film gold converter by one beam of the ISKRA-5 laser facility. Typical laser intensity on the converter was (1-5)1013 W/cm2 and laser pulse duration was 0.5-0.6 ns. The effective temperature of sample under experimental conditions didn't exceed 30-40 eV. The sample was tampered by 1 m plastic layers on both sides to avoid its rarefaction during heating and to obtain a quasistationary layer of a dense plasma prepared to be probed by a backlighter. The backlighter was aluminum or dysprosium film irradiated by another beam of the ISKRA-5 laser facility with an intensity of 1014-1015 W/cm2. Probe x-rays were registered by a Bragg spectrometer with spatial resolution. Comparison between experimental data and simulations is discussed.
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