Characterization of the LCLS “nanosecond two-bunch” mode for x-ray speckle visibility spectroscopy experiments

Yanwen Sun; Diling Zhu; Sanghoon Song; Franz-Josef Decker; Mark Sutton; Karl Ludwig; Wojciech Roseker; Gerhard Grübel; Stephan Hruszkewycz; G. Brian Stephenson; Paul H. Fuoss; Aymeric Robert

doi:10.1117/12.2265454

23 May 2017 Characterization of the LCLS “nanosecond two-bunch” mode for x-ray speckle visibility spectroscopy experiments

Yanwen Sun, Diling Zhu, Sanghoon Song, Franz-Josef Decker, Mark Sutton, Karl Ludwig, Wojciech Roseker, Gerhard Grübel, Stephan Hruszkewycz, G. Brian Stephenson, Paul H. Fuoss, Aymeric Robert

Author Affiliations +

Proceedings Volume 10237, Advances in X-ray Free-Electron Lasers Instrumentation IV; 102370N (2017) https://doi.org/10.1117/12.2265454
Event: SPIE Optics + Optoelectronics, 2017, Prague, Czech Republic

Abstract

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. The multi-shot average-speckle contrasts from individual pulses and pulse pairs are compared.

Conference Presentation

Citation Download Citation

Yanwen Sun, Diling Zhu, Sanghoon Song, Franz-Josef Decker, Mark Sutton, Karl Ludwig, Wojciech Roseker, Gerhard Grübel, Stephan Hruszkewycz, G. Brian Stephenson, Paul H. Fuoss, and Aymeric Robert "Characterization of the LCLS “nanosecond two-bunch” mode for x-ray speckle visibility spectroscopy experiments", Proc. SPIE 10237, Advances in X-ray Free-Electron Lasers Instrumentation IV, 102370N (23 May 2017); https://doi.org/10.1117/12.2265454

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available