We report a recent experiment where the first hard x-ray beam line, X-ray Pump Probe (XPP) instrument using the
SLAC National Accelerator Laboratory's Linac Coherent Light Source (LCLS) free electron laser, was used to heat thin
foils to high energy densities ~ 107 J/cm3. An intense 9 keV, 60 fs (FWHM) duration beam with energy of 2 - 4 mJ at
the XPP beam line was focused using beryllium lenses to an irradiance approaching 1016 Wcm-2. Targets of 0.5 - 3.5 μm
thick foils of Ag and Cu were studied using a suite of diagnostics including Fourier Domain Interferometry, energy
calorimetry and grating and crystal spectrometers. The experimental details and spectroscopic results from the campaign
will be described. Preliminary results indicate that the target is heated relatively uniformly to a temperature lower than
20 eV.
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