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8 October 2014 Silicon single crystal as back-reflector for high-intensity hard x-rays
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At the Lawrence Livermore National Laboratory (LLNL) we have engineered a silicon prototype sample that can be used to reflect focused hard x-ray photons at high intensities in back-scattering geometry.1 Our work is motivated by the need for an all-x-ray pump-and-probe capability at X-ray Free Electron Lasers (XFELs) such as the Linac Coherent Light Source (LCSL) at SLAC. In the first phase of our project, we exposed silicon single crystal to the LCLS beam, and quantitatively studied the x-ray induced damage as a function of x-ray fluence. The damage we observed is extensive at fluences typical of pump-and-probe experiments. The conclusions drawn from our data allowed us to design and manufacture a silicon mirror that can limit the local damage, and reflect the incident beam before its single crystal structure is destroyed. In the second phase of this project we tested this prototype back-reflector at the LCLS. Preliminary results suggest that the new mirror geometry yields reproducible Bragg reflectivity at high x-ray fluences, promising a path forward for silicon single crystals as x-ray back-reflectors.
© (2014) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Tom Pardini, Sébastien Boutet, Joseph Bradley, Tilo Doeppner, Luke B. Fletcher, Dennis F. Gardner Jr., Randy M. Hill, Mark S. Hunter, Jacek Krzywinski, Marc Messerschmidt, Arthur E. Pak, Florian Quirin, Klaus Sokolowski-Tinten, Garth J. Williams, and Stefan P. Hau-Riege "Silicon single crystal as back-reflector for high-intensity hard x-rays", Proc. SPIE 9210, X-Ray Free-Electron Lasers: Beam Diagnostics, Beamline Instrumentation, and Applications II, 92100D (8 October 2014);


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