Absorption Spectroscopy Of A Radiatively Heated Aluminium Layer

C. Chenais-Popovics; C. Fievet; J. P. Geindre; J. C. Gauthier; E. Luc-Koenig; J. F. Wyart; H. Pepin; M. Chaker

doi:10.1117/12.961881

27 November 1989 Absorption Spectroscopy Of A Radiatively Heated Aluminium Layer

C. Chenais-Popovics, C. Fievet, J. P. Geindre, J. C. Gauthier, E. Luc-Koenig, J. F. Wyart, H. Pepin, M. Chaker

Proceedings Volume 1140, X-Ray Instrumentation in Medicine and Biology, Plasma Physics, Astrophysics, and Synchrotron Radiation; (1989) https://doi.org/10.1117/12.961881
Event: 1989 International Congress on Optical Science and Engineering, 1989, Paris, France

Abstract

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.

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C. Chenais-Popovics, C. Fievet, J. P. Geindre, J. C. Gauthier, E. Luc-Koenig, J. F. Wyart, H. Pepin, and 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); https://doi.org/10.1117/12.961881

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