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

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. Furthermore, the multi-shot average-speckle contrasts from individual pulses and pulse pairs are compared.

Authors:
 [1];  [1];  [1];  [1];  [2];  [3];  [4];  [4];  [5];  [5];  [5];  [1]
  1. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  2. McGill Univ., Montreal, QC (Canada)
  3. Boston Univ., Chestnut Hill, MA (United States)
  4. Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
  5. Argonne National Lab. (ANL), Lemont, IL (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22), Materials Sciences and Engineering Division
OSTI Identifier:
1393197
Grant/Contract Number:
AC02-06CH11357
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Proceedings of SPIE - The International Society for Optical Engineering
Additional Journal Information:
Journal Volume: 10237; Journal ID: ISSN 0277-786X
Publisher:
SPIE
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Sun, Yanwen, Zhu, Diling, Song, Sanghoon, Decker, Franz -Josef, Sutton, Mark, Ludwig, Karl, Roseker, Wojciech, Grubel, Gerhard, Hruszkewycz, Stephan, Stephenson, G. Brian, Fuoss, Paul H., and Robert, Aymeric. Characterization of the LCLS “nanosecond two-bunch” mode for x-ray speckle visibility spectroscopy experiments. United States: N. p., 2017. Web. doi:10.1117/12.2265454.
Sun, Yanwen, Zhu, Diling, Song, Sanghoon, Decker, Franz -Josef, Sutton, Mark, Ludwig, Karl, Roseker, Wojciech, Grubel, Gerhard, Hruszkewycz, Stephan, Stephenson, G. Brian, Fuoss, Paul H., & Robert, Aymeric. Characterization of the LCLS “nanosecond two-bunch” mode for x-ray speckle visibility spectroscopy experiments. United States. doi:10.1117/12.2265454.
Sun, Yanwen, Zhu, Diling, Song, Sanghoon, Decker, Franz -Josef, Sutton, Mark, Ludwig, Karl, Roseker, Wojciech, Grubel, Gerhard, Hruszkewycz, Stephan, Stephenson, G. Brian, Fuoss, Paul H., and Robert, Aymeric. 2017. "Characterization of the LCLS “nanosecond two-bunch” mode for x-ray speckle visibility spectroscopy experiments". United States. doi:10.1117/12.2265454.
@article{osti_1393197,
title = {Characterization of the LCLS “nanosecond two-bunch” mode for x-ray speckle visibility spectroscopy experiments},
author = {Sun, Yanwen and Zhu, Diling and Song, Sanghoon and Decker, Franz -Josef and Sutton, Mark and Ludwig, Karl and Roseker, Wojciech and Grubel, Gerhard and Hruszkewycz, Stephan and Stephenson, G. Brian and Fuoss, Paul H. and Robert, Aymeric},
abstractNote = {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.},
doi = {10.1117/12.2265454},
journal = {Proceedings of SPIE - The International Society for Optical Engineering},
number = ,
volume = 10237,
place = {United States},
year = 2017,
month = 5
}

Journal Article:
Free Publicly Available Full Text
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  • The single shot based coherence properties of hard x-ray pulses from the Linac Coherent Light Source (LCLS) were measured by analyzing coherent diffraction patterns from nano-particles and gold nanopowder. The intensity histogram of the small angle x-ray scattering ring from nano-particles reveals the fully transversely coherent nature of the LCLS beam with a number of transverse modemore » $$\langle$$M s$$\rangle$$ = 1.1. On the other hand, the speckle contrasts measured at a large wavevector yields information about the longitudinal coherence of the LCLS radiation after a silicon (111) monochromator. The quantitative agreement between our data and the simulation confirms a mean coherence time of 2.2 fs and a x-ray pulse duration of 29 fs. Lastly the observed reduction of the speckle contrast generated by x-rays with pulse duration longer than 30 fs indicates ultrafast dynamics taking place at an atomic length scale prior to the permanent sample damage.« less
  • Pseudosingle-bunch kick-and-cancel (PSB-KAC) is a new operational mode at the Advanced Light Source of Lawrence Berkeley National Laboratory that provides full timing and repetition rate control for single x-ray pulse users while being fully transparent to other users of synchrotron radiation light. In this operational mode, a single electron bunch is periodically displaced from a main bunch train by a fast kicker magnet with a user-on-demand repetition rate, creating a single x-ray pulse to be matched to a typical laser excitation pulse rate. This operational mode can significantly improve the signal to noise ratio of single x-ray pulse experiments andmore » drastically reduce dose-induced sample damage rate. It greatly expands the capabilities of synchrotron light sources to carry out dynamics and time-of-flight experiments. In this paper, we carry out extensive characterizations of this PSB-KAC mode both numerically and experimentally. This includes the working principle of this mode, resonance conditions and beam stability, experimental setups, and diagnostic tools and measurements.« less
  • Pseudosingle-bunch kick-and-cancel (PSB-KAC) is a new operational mode at the Advanced Light Source of Lawrence Berkeley National Laboratory that provides full timing and repetition rate control for single x-ray pulse users while being fully transparent to other users of synchrotron radiation light. In this operational mode, a single electron bunch is periodically displaced from a main bunch train by a fast kicker magnet with a user-on-demand repetition rate, creating a single x-ray pulse to be matched to a typical laser excitation pulse rate. This operational mode can significantly improve the signal to noise ratio of single x-ray pulse experiments andmore » drastically reduce dose-induced sample damage rate. It greatly expands the capabilities of synchrotron light sources to carry out dynamics and time-of-flight experiments. In this paper, we carry out extensive characterizations of this PSB-KAC mode both numerically and experimentally. This includes the working principle of this mode, resonance conditions and beam stability, experimental setups, and diagnostic tools and measurements.« less