22 September 2015 The MEL-X project at the Lawrence Livermore National Laboratory: a mirror-based delay line for x-rays
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At the Lawrence Livermore National Laboratory (LLNL) in collaboration with the Linac Coherent Light Source (LCLS) we are developing a mirror-based delay line for x-rays (MEL-X) to enable x-ray pump/x-ray probe experiments at Free Electron Lasers (XFELs). The goal of this project is the development and deployment of a proof-of-principle delay line featuring coated x-ray optics. The four-mirror design of the MEL-X is motivated by the need for ease of alignment and use. In order to simplify the overlap of the pump and the probe beam after each delay time change, a scheme involving super-polished rails and mirror-to-motor decoupling has been adopted. The MEL-X, used in combination with a bright pulsed source like LCLS, features a capability for a high intensity pump beam. Its Iridium coating allows it to work at hard x-ray energies all the way up to 9 keV, with a probe beam transmission of 35% up to 8keV, and 14% at 9keV. The delay time can be tailored to each particular experiment, with a nominal range of 70 - 350 fs for this prototype. The MEL-X, combined with established techniques such as x-ray diffraction, absorption or emission, could provide new insights on ultra-fast transitions in highly excited states of matter.
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Tom Pardini, Tom Pardini, Randy Hill, Randy Hill, Todd Decker, Todd Decker, Jennifer Alameda, Jennifer Alameda, Regina Soufli, Regina Soufli, Andy Aquila, Andy Aquila, Serge Guillet, Serge Guillet, Sébastien Boutet, Sébastien Boutet, Stefan P. Hau-Riege, Stefan P. Hau-Riege, } "The MEL-X project at the Lawrence Livermore National Laboratory: a mirror-based delay line for x-rays", Proc. SPIE 9589, X-Ray Lasers and Coherent X-Ray Sources: Development and Applications XI, 95890T (22 September 2015); doi: 10.1117/12.2186796; https://doi.org/10.1117/12.2186796

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