Interaction of laser radiation with targets

Tomographic imaging of a target directly irradiated in experiments on the Iskra-5 iodine laser facility

S. V. Bondarenko, R. V. Garanin, S. G. Garanin, N. V. Zhidkov, O. V. Oreshkov, S. V. Potapov, N. A. Suslov, N. V. Frolova

Federal State Unitary Enterprise "Russian Federal Nuclear Center — All-Russian Research Institute of Experimental Physics", Sarov

Abstract: We set forth the data of experiments involving direct microtarget irradiation by the 12 second-harmonic beams (λ = 0.66 μm) of iodine laser radiation carried out on the Iskra-5 facility. For microtargets we employed glass shells ~500 μm in diameter with ~1-μm thick walls, which were filled with a DT mixture at a pressure p_DT ≈ 3-4 atm. In one of these experiments, a tomographic image of the microtarget was recorded from the images obtained using pinhole cameras, which were arranged along seven different directions. The pinhole images were acquired in the X-ray radiation with photon energies above 1.5 keV. The procedure used for reconstructing the volume luminosity of the microtarget is described. An analysis of the tomographic image suggests that the compressed microtarget domain possesses a complex asymmetric shape; 20—30 μm sized structural elements being clearly visible. The resultant data set allowed us to estimate the initial nonuniformity of microtarget surface irradiation by the laser radiation. The rms nonuniformity of microtarget irradiance was estimated at ~60 %.

PACS: 52.57.Bc, 52.70.La, 42.30.Wb, 42.55.Ks

Received: 12.05.2010

 English version: Quantum Electronics, 2010, 40:11, 1041–1044

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