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Published online by Cambridge University Press: 30 July 2001
New fields of X-ray source applications (X-ray laser and high order harmonic generation) could appear if an intensity higher than 1012 Wcm−2 is reached. Following this goal, we have started a complete investigation of the X-ray beam wavefront both numerically and experimentally. The first XUV wavefront sensor has been developed and tested on different XUV sources. For a better comprehension of the experimental results, a numerical work (ray-trace code) has been performed. We present and discuss the first results obtained on the X-ray laser at 21.2 nm.