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Characterization of the LCLS “nanosecond two-bunch” mode for x-ray speckle visibility spectroscopy experiments [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy. Office of Basic Energy Sciences, 2017.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
Physical Description
10 pages : digital, PDF file
Additional Creators
Argonne National Laboratory, United States. Department of Energy. Office of Basic Energy Sciences, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
The generation of two X-ray pulses with tunable nanosecond scale time separations has recently been demonstrated at the Linac Coherent Light Source using an accelerator based technique. This approach offers the opportunity to extend X-ray Photon Correlation Spectroscopy techniques to the yet unexplored regime of nanosecond timescales by means of X-ray Speckle Visibility Spectroscopy. As the two pulses originate from two independent Spontaneous Amplified Stimulated Emission processes, the beam properties fluctuate from pulse pair to pulse pair, but as well between the individual pulses within a pair. However, two-pulse XSVS experiments require the intensity of the individual pulses to be either identical in the ideal case, or with a accurately known intensity ratio. We present the design and performances of a non-destructive intensity diagnostic based on measurement of scattering from a transparent target using a high-speed photo-detector. Individual pulses within a pulse pair with time delays as short as 0.7 ns can be resolved. Moreover, using small angle coherent scattering, we characterize the averaged spatial overlap of the focused pulse pairs. Furthermore, the multi-shot average-speckle contrasts from individual pulses and pulse pairs are compared.
Report Numbers
E 1.99:1393197
Subject(s)
Note
Published through SciTech Connect.
05/23/2017.
"135314"
Proceedings of SPIE - The International Society for Optical Engineering 10237 ISSN 0277-786X AM
Yanwen Sun; Diling Zhu; Sanghoon Song; Franz -Josef Decker; Mark Sutton; Karl Ludwig; Wojciech Roseker; Gerhard Grubel; Stephan Hruszkewycz; G. Brian Stephenson; Paul H. Fuoss; Aymeric Robert.
Funding Information
AC02-06CH11357
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