The ability to split femtosecond free electron laser pulses and recombine them with a precisely adjustable delay has numerous scientific applications such as X-ray Photon Correlation Spectroscopy and X-ray pump X-ray probe measurements. A wavefront-splitting based hard X-ray split-delay system is currently under development at the Linac Coherent Light Source. The design configuration uses a series of Si(220) crystal reflections in the horizontal scattering geometry. It covers an energy range between 6.5 and 13 keV, a delay range from -30 ps up to 500 ps at 8 keV. The design features two planar air bearing based linear stage delay lines for improved stability and accuracy during the delay adjustments in order to maintain spatial overlap of the two branches during a delay scan. We present the basic design concept, tolerance analysis, and estimated performance of the system.
Diling Zhu, Yanwen Sun, Donald W. Schafer, Hongliang Shi, Justin H. James, Karl L. Gumerlock, Ted O. Osier, Randy Whitney, Lin Zhang, Josep Nicolas, Brian Smith, Andrew H. Barada, and Aymeric Robert, "Development of a hard x-ray split-delay system at the Linac Coherent Light Source," Proc. SPIE 10237, Advances in X-ray Free-Electron Lasers Instrumentation IV, 102370R (Presented at SPIE Optics + Optoelectronics: April 27, 2017; Published: 14 June 2017); https://doi.org/10.1117/12.2265171.
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Study of self-shadowing effect as a simple means to realize nanostructured thin films and layers with special attentions to birefringent obliquely deposited thin films and photo-luminescent porous silicon