FEL multilayer optics damaged by multiple shot laser beam: experimental results and discussion (Abstract/Poster in atti di convegno)

Type
Label
  • FEL multilayer optics damaged by multiple shot laser beam: experimental results and discussion (Abstract/Poster in atti di convegno) (literal)
Anno
  • 2011-01-01T00:00:00+01:00 (literal)
Alternative label
  • A.Giglia, N. Mahne, A. Bianco, C. Svetina, S. Nannarone (2011)
    FEL multilayer optics damaged by multiple shot laser beam: experimental results and discussion
    in Damage to VUV, EUV, and X-ray Optics (XDam3), Prague, 18-20 april 2011
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • A.Giglia, N. Mahne, A. Bianco, C. Svetina, S. Nannarone (literal)
Note
  • Poster (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • 1 IOM - CNR Laboratorio TASC, Strada tatale 14 - km 163,5, 34149 Basovizza, Trieste ITALY 2 Sincrotrone Trieste S.C.p.A., Strada Statale 14 - km 163,5, 34149 Basovizza, Trieste ITALY 3 Universit√† di Modena e Reggio Emilia, Dip. Ing. Materiali, V. Vignolese (literal)
Titolo
  • FEL multilayer optics damaged by multiple shot laser beam: experimental results and discussion (literal)
Abstract
  • The irradiation effects of multiple femtosecond shots of a 400 nm laser beam with estimated fluences of some tens of mJ/cm2 on a EUV Mo/Si multilayer have been studied. The study has been motivated by the need of multilayer Mo/Si optics for the delay lines of the FEL source FERMI@Elettra, where these mirrors will be used to reflect 100 fs pulses at 13 nm with a fluence of some mJ/cm2. The analysis was carried on by means of different techniques as EUV and soft X-ray reflectivity, XPS, Total Electron Yield and Standing wave enhanced XPS [1]. Measurements have been performed at the BEAR synchrotron beamline @ Elettra. Simulations have been carried on by means of a new home made software 'OPAL' for the calculation of the intensity of the electric field inside the stratified medium [2]. Preliminary measurements have been performed also with a new fluorescence detector. A simple thermodynamic model have been also used to investigate the propagation of heat during the laser irradiation. AFM and SEM surface images have been also acquired. We observed a significant change in the multilayer performance at fluences of 100 mJ/cm2 and above with a significant reduction of reflectivity. Spectroscopic analysis allowed to correlate the decrease of reflectivity with the degradation of the multilayer stacking, ascribed to Mo-Si intermixing at the Mo/Si interfaces of the first layers, close to the surface of the mirror. (literal)
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