28 September 2011 Development of supermirrors for high-resolution x-ray LMJ microscopes
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Abstract
With regards to the future Laser Megajoules french facility (LMJ), our laboratory is developing advanced time-resolved High Resolution X-ray Imaging (HRXI) systems to diagnose laser produced plasma. Shrapnel and X-ray loading on this laser imposes to place any HRXI as far away from the source as possible. Grazing incidence X-ray microscopes are the best solution to overpass this limitation. These imagers combine therefore grazing X-ray microscope and camera. We designed imaging diagnostics, mainly with a long working distance (> 50 cm) and high spatial resolution. All of them are composed of single or multi-toroïdal(s) mirror(s). To increase the bandwidth of reflectivity of all these mirrors, multilayer coatings have been deposited. We present mainly microscopes using non-periodic W/SiC multilayer coatings (Supermirrors), developed in collaboration with Institut d'Optique. Supermirrors were designed for a first set of diagnostics to work at 0.7° grazing incidence. Secondly, we have implemented this supermirror on a Wolter-type microscope used at a smaller grazing incidence (0.6° angle) in order to increase the bandwidth of reflectivity up to 12 keV. Metrology for x-ray reflectance in the whole range on the synchrotron radiation facility BESSY II is also presented.
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Ph. Troussel, Ph. Troussel, D. Dennetiere, D. Dennetiere, R. Rosch, R. Rosch, C. Reverdin, C. Reverdin, H. Hartmann, H. Hartmann, F. Bridou, F. Bridou, E. Meltchakov, E. Meltchakov, F. Delmotte, F. Delmotte, } "Development of supermirrors for high-resolution x-ray LMJ microscopes", Proc. SPIE 8139, Advances in X-Ray/EUV Optics and Components VI, 81390C (28 September 2011); doi: 10.1117/12.895944; https://doi.org/10.1117/12.895944
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