27 November 1989 Absorption Spectroscopy Of A Radiatively Heated Aluminium Layer
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We present here a direct diagnostic of the shallow temperature gradient created in the very dense region of a laser irradiated target by X-UV radiation. A multilayered target composed of a plastic substrate covered with a thin samarium layer is irradiated with a 0.26 μm wavelength laser pulse at irradiances of 3. 1014 W/cm2. A thin aluminium layer is inserted in the plastic as an absorbing tracer at different distances from the samarium. Kα absorption lines appear in the samarium quasi-continuum emission around 1.5 keV. The analysis of these lines gives the temperature of the aluminium layer. A shallow temperature gradient between 40 and 100 eV is measured and compared with radiative hydrocode simulations which predict that the X-UV emission of samarium around 400 eV create a radiative heat wave responsible of the observed temperature gradient.
© (1989) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
C. Chenais-Popovics, C. Chenais-Popovics, C. Fievet, C. Fievet, J. P. Geindre, J. P. Geindre, J. C. Gauthier, J. C. Gauthier, E. Luc-Koenig, E. Luc-Koenig, J. F. Wyart, J. F. Wyart, H. Pepin, H. Pepin, M. Chaker, M. Chaker, } "Absorption Spectroscopy Of A Radiatively Heated Aluminium Layer", Proc. SPIE 1140, X-Ray Instrumentation in Medicine and Biology, Plasma Physics, Astrophysics, and Synchrotron Radiation, (27 November 1989); doi: 10.1117/12.961881; https://doi.org/10.1117/12.961881


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