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Research

Radiation Damage 

 

Collaboration with Sincrotrone Trieste (A. Bianco, C. Svetina, N. Mahne)
 

The handling and transport of photon beam at the new free-electron lasers (FELs) light sources present demanding technological requirements mainly because of radiation damage which can be induced in optical coatings. Theoretical and experimental studies are crucial to understand the mechanisms of damage process occurring at optical surfaces irradiated by XUV ultra short pulses of extremely high fluences. Of particular interest is the response to the high intensity XUV FEL pulses of multilayer coated optics, due to their useful and widely exploited properties as high reflectivity mirrors working at near normal incidence. These optics are absolutely promising for FEL experiments, where they must satisfy extremely demanding requirements in space and time handling of the wavefront. Different techniques, as specular and diffuse reflectivity, X-ray Photoemission Spectroscopy (XPS) and Total Electron Yield (TEY) in the EUV and soft X-ray range, Standing wave enhanced XPS can give important indications on the evolution of the first interfaces of irradiated mirrors.

Standing wave enhanced XPS on a radiation damaged multilayer mirror: the analysis of the peak intensity gives quantitative indications of the evolution of the surface and of the buried interfaces 



Last Updated on Tuesday, 08 May 2012 15:32