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In this Seminar I will describe the ongoing
investigations into the interaction of high-intensity XUV light with
materials in extreme conditions. The focus will be on the series of
experiments that took place using FLASH - the first XUV Free-Electron Laser
and the attempts to create and probe Warm Dense Matter using Aluminium as the target metal. By focusing the 92eV FEL
beam using a specially designed Off-Axis Parabolic mirror, we created the
highest intensity XUV light ever produced.
We then went on to induce transparency in thin Al
films with the high-intensity pulses and using an XUV spectrometer we were
able to obtain a great deal of information on the propertied and
distribution of the electrons in the conduction band in this highly excited
state. We also look at the optical properties of Warm Dense Aluminium for photons with energies below the L-edge
and finally attempt to describe the evolution of the Al target when
irradiated by a high-intensity XUV pulse using results gathered in this
Thesis, theoretical models and computer simulations.
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