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27 November 1989 Soft X-Ray Imaging Of Laser Produced Plasmas
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The emission of laser created plasmas in the X-UV range (i.e. around 100eV) comes from a very dense and a relatively cold region. A specific use of the X-UV imaging of laser plasmas is the record of the emission of the backside of illuminated thin foils. A very hot plasma (≥1keV temperature) takes place on the front side of the thin foil target when illuminated by a powerful laser. This hot plasma radiates in the forward and backward directions. Inside the target, the radiation is absorbed by the solid material and increases its temperature. Several calculations show that this effect called radiative preheat or radiative heating is very important in inertial fusion experiments at short laser wavelengths. We present, in this paper, a calculation which shows the mechanism of radiative heating of a foil. Then, we demonstrate the interest of recording emission in the X-UV range to determine a backside temperature and prevent optical depth effects. Finally, we present records of the time resolved emission of the backside of thin aluminium foils(5 and 10 μm). The records are done with four Schwartzchild microscopes coupled with an X-UV streak camera. The recorded wavelengths are 10, 40, 80, and 108 eV; the time resolution is 25 picosecondes. A backside temperature is tried to be deduced from the results.
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R. Benattar and V. Malka "Soft X-Ray Imaging Of Laser Produced Plasmas", Proc. SPIE 1140, X-Ray Instrumentation in Medicine and Biology, Plasma Physics, Astrophysics, and Synchrotron Radiation, (27 November 1989);

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