TY - JOUR
T1 - Silicon Mirrors for High-Intensity X-Ray Pump and Probe Experiments
AU - Pardini, Tom
AU - Boutet, Sébastien
AU - Bradley, Joseph
AU - Döppner, Tilo
AU - Fletcher, Luke B.
AU - Gardner, Dennis F.
AU - Hill, Randy M.
AU - Hunter, Mark S.
AU - Krzywinski, Jacek
AU - Messerschmidt, Marc
AU - Pak, Arthur E.
AU - Quirin, Florian
AU - Sokolowski-Tinten, Klaus
AU - Williams, Garth J.
AU - Hau-Riege, Stefan P.
N1 - Publisher Copyright:
© 2014 American Physical Society.
PY - 2014/5/28
Y1 - 2014/5/28
N2 - An all-x-ray pump and probe capability is highly desired for the free-electron laser community. A possible implementation involves the use of an x-ray mirror downstream of the sample to backreflect the pump beam onto itself. We expose silicon single crystals, a candidate for this hard-x-ray mirror, to the hard-x-ray beam of the Linac Coherent Light Source (SLAC National Acceleration Laboratory) to assess its suitability. We find that silicon is an appropriate mirror material, but its reflectivity at high x-ray fluences is somewhat unpredictable. We attribute this behavior to x-ray-induced local damage in the mirror, which we have characterized post mortem via microdiffraction, scanning electron microscopy, and Raman spectroscopy. We demonstrate a strategy to reduce local damage by using a structured silicon-based mirror. Preliminary results suggest that the latter yields reproducible Bragg reflectivity at high x-ray fluences, promising a path forward for silicon single crystals as x-ray backreflectors.
AB - An all-x-ray pump and probe capability is highly desired for the free-electron laser community. A possible implementation involves the use of an x-ray mirror downstream of the sample to backreflect the pump beam onto itself. We expose silicon single crystals, a candidate for this hard-x-ray mirror, to the hard-x-ray beam of the Linac Coherent Light Source (SLAC National Acceleration Laboratory) to assess its suitability. We find that silicon is an appropriate mirror material, but its reflectivity at high x-ray fluences is somewhat unpredictable. We attribute this behavior to x-ray-induced local damage in the mirror, which we have characterized post mortem via microdiffraction, scanning electron microscopy, and Raman spectroscopy. We demonstrate a strategy to reduce local damage by using a structured silicon-based mirror. Preliminary results suggest that the latter yields reproducible Bragg reflectivity at high x-ray fluences, promising a path forward for silicon single crystals as x-ray backreflectors.
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U2 - 10.1103/PhysRevApplied.1.044007
DO - 10.1103/PhysRevApplied.1.044007
M3 - Article
AN - SCOPUS:84941357445
SN - 2331-7019
VL - 1
JO - Physical Review Applied
JF - Physical Review Applied
IS - 4
M1 - 044007
ER -