Absolute contrast estimation for soft X-ray photon fluctuation spectroscopy using a variational droplet model
Abstract
Abstract X-ray photon fluctuation spectroscopy using a two-pulse mode at the Linac Coherent Light Source has great potential for the study of quantum fluctuations in materials as it allows for exploration of low-energy physics. However, the complexity of the data analysis and interpretation still prevent recovering real-time results during an experiment, and can even complicate post-analysis processes. This is particularly true for high-spatial resolution applications using CCDs with small pixels, which can decrease the photon mapping accuracy resulting from the large electron cloud generation at the detector. Droplet algorithms endeavor to restore accurate photon maps, but the results can be altered by their hyper-parameters. We present numerical modeling tools through extensive simulations that mimic previous x-ray photon fluctuation spectroscopy experiments. By modification of a fast droplet algorithm, our results demonstrate how to optimize the precise parameters that lift the intrinsic counting degeneracy impeding accuracy in extracting the speckle contrast. These results allow for an absolute determination of the summed contrast from multi-pulse x-ray speckle diffraction, the modus operandi by which the correlation time for spontaneous fluctuations can be measured.
- Authors:
- Publication Date:
- Research Org.:
- SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1823297
- Alternate Identifier(s):
- OSTI ID: 1818976
- Grant/Contract Number:
- AC02-76SF00515
- Resource Type:
- Published Article
- Journal Name:
- Scientific Reports
- Additional Journal Information:
- Journal Name: Scientific Reports Journal Volume: 11 Journal Issue: 1; Journal ID: ISSN 2045-2322
- Publisher:
- Nature Publishing Group
- Country of Publication:
- United Kingdom
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Characterization and analytical techniques; Scientific data
Citation Formats
Burdet, N. G., Esposito, V., Seaberg, M. H., Yoon, C. H., and Turner, J. J. Absolute contrast estimation for soft X-ray photon fluctuation spectroscopy using a variational droplet model. United Kingdom: N. p., 2021.
Web. doi:10.1038/s41598-021-98774-3.
Burdet, N. G., Esposito, V., Seaberg, M. H., Yoon, C. H., & Turner, J. J. Absolute contrast estimation for soft X-ray photon fluctuation spectroscopy using a variational droplet model. United Kingdom. https://doi.org/10.1038/s41598-021-98774-3
Burdet, N. G., Esposito, V., Seaberg, M. H., Yoon, C. H., and Turner, J. J. Thu .
"Absolute contrast estimation for soft X-ray photon fluctuation spectroscopy using a variational droplet model". United Kingdom. https://doi.org/10.1038/s41598-021-98774-3.
@article{osti_1823297,
title = {Absolute contrast estimation for soft X-ray photon fluctuation spectroscopy using a variational droplet model},
author = {Burdet, N. G. and Esposito, V. and Seaberg, M. H. and Yoon, C. H. and Turner, J. J.},
abstractNote = {Abstract X-ray photon fluctuation spectroscopy using a two-pulse mode at the Linac Coherent Light Source has great potential for the study of quantum fluctuations in materials as it allows for exploration of low-energy physics. However, the complexity of the data analysis and interpretation still prevent recovering real-time results during an experiment, and can even complicate post-analysis processes. This is particularly true for high-spatial resolution applications using CCDs with small pixels, which can decrease the photon mapping accuracy resulting from the large electron cloud generation at the detector. Droplet algorithms endeavor to restore accurate photon maps, but the results can be altered by their hyper-parameters. We present numerical modeling tools through extensive simulations that mimic previous x-ray photon fluctuation spectroscopy experiments. By modification of a fast droplet algorithm, our results demonstrate how to optimize the precise parameters that lift the intrinsic counting degeneracy impeding accuracy in extracting the speckle contrast. These results allow for an absolute determination of the summed contrast from multi-pulse x-ray speckle diffraction, the modus operandi by which the correlation time for spontaneous fluctuations can be measured.},
doi = {10.1038/s41598-021-98774-3},
journal = {Scientific Reports},
number = 1,
volume = 11,
place = {United Kingdom},
year = {Thu Sep 30 00:00:00 EDT 2021},
month = {Thu Sep 30 00:00:00 EDT 2021}
}
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