Accurate contrast determination for X-ray speckle visibility spectroscopy

Sun, Yanwen; Montana-Lopez, Jordi; Fuoss, Paul; Sutton, Mark; Zhu, Diling

doi:10.1107/S1600577520006773

Title: Accurate contrast determination for X-ray speckle visibility spectroscopy

Journal Article · Fri Jun 19 00:00:00 EDT 2020 · Journal of Synchrotron Radiation (Online)

DOI:https://doi.org/10.1107/S1600577520006773· OSTI ID:1633929

; Montana-Lopez, Jordi;

; Sutton, Mark; Zhu, Diling

X-ray speckle visibility spectroscopy using X-ray free-electron lasers has long been proposed as a probe of fast dynamics in noncrystalline materials. In this paper, numerical modeling is presented to show how the data interpretation of visibility spectroscopy can be impacted by the nonidealities of real-life X-ray detectors. Using simulated detector data, this work provides a detailed analysis of the systematic errors of several contrast extraction algorithms in the context of low-count-rate X-ray speckle visibility spectroscopy and their origins are discussed. Here, it was found that the finite detector charge cloud and pixel size lead to an unavoidable `degeneracy' in photon position determination, and that the contrasts extracted using different algorithms can all be corrected by a simple linear model. The results suggest that experimental calibration of the correction coefficient at the count rate of interest is possible and essential. This allows computationally lightweight algorithms to be implemented for on-the-fly analysis.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1633929

Alternate ID(s):: OSTI ID: 1633435

Journal Information:: Journal of Synchrotron Radiation (Online), Journal Name: Journal of Synchrotron Radiation (Online) Vol. 27 Journal Issue: 4; ISSN 1600-5775

Publisher:: International Union of CrystallographyCopyright Statement

Country of Publication:: Denmark

Language:: English

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Cited by: 12 works

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Web of Science

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