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Title: Attosecond Coherence Time Characterization in Hard X-Ray Free-Electron Laser

Abstract

One of the key challenges in scientific researches based on free-electron lasers (FELs) is the characterization of the coherence time of the ultra-fast hard x-ray pulse, which fundamentally influences the interaction process between x-rays and materials. Conventional optical methods, based on autocorrelation, are very difficult to realize due to the lack of mirrors. Here, we experimentally demonstrate a novel method which yields a coherence time of 174.7 attoseconds for the 6.92 keV FEL pulses at the Linac Coherent Light Source. In our experiment, a phase shifter is adopted to control the cross-correlation between x-ray and microbunched electrons. This approach provides critical diagnostics for the temporal coherence of x-ray FELs and is universal for general machine parameters; applicable for wide range of photon energy, radiation brightness, repetition rate and FEL pulse duration.

Authors:
; ; ; ; ORCiD logo; ORCiD logo; ORCiD logo; ; ; ; ; ; ; ; ORCiD logo
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1619824
Alternate Identifier(s):
OSTI ID: 1623285
Grant/Contract Number:  
AC02-76SF00515; FWP-2013-SLAC-100164
Resource Type:
Published Article
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Name: Scientific Reports Journal Volume: 10 Journal Issue: 1; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Country of Publication:
United Kingdom
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS

Citation Formats

Zhou, Guanqun, Decker, Franz-Josef, Ding, Yuantao, Jiao, Yi, Lutman, Alberto A., Maxwell, Timothy J., Raubenheimer, Tor O., Wang, Jiuqing, Holman, Aaron J., Tsai, Cheng-Ying, Wu, Jerome Y., Wu, Weiwei, Yang, Chuan, Yoon, Moohyun, and Wu, Juhao. Attosecond Coherence Time Characterization in Hard X-Ray Free-Electron Laser. United Kingdom: N. p., 2020. Web. doi:10.1038/s41598-020-60328-4.
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Zhou, Guanqun, Decker, Franz-Josef, Ding, Yuantao, Jiao, Yi, Lutman, Alberto A., Maxwell, Timothy J., Raubenheimer, Tor O., Wang, Jiuqing, Holman, Aaron J., Tsai, Cheng-Ying, Wu, Jerome Y., Wu, Weiwei, Yang, Chuan, Yoon, Moohyun, & Wu, Juhao. Attosecond Coherence Time Characterization in Hard X-Ray Free-Electron Laser. United Kingdom. https://doi.org/10.1038/s41598-020-60328-4
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Zhou, Guanqun, Decker, Franz-Josef, Ding, Yuantao, Jiao, Yi, Lutman, Alberto A., Maxwell, Timothy J., Raubenheimer, Tor O., Wang, Jiuqing, Holman, Aaron J., Tsai, Cheng-Ying, Wu, Jerome Y., Wu, Weiwei, Yang, Chuan, Yoon, Moohyun, and Wu, Juhao. Mon . "Attosecond Coherence Time Characterization in Hard X-Ray Free-Electron Laser". United Kingdom. https://doi.org/10.1038/s41598-020-60328-4.
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@article{osti_1619824,
title = {Attosecond Coherence Time Characterization in Hard X-Ray Free-Electron Laser},
author = {Zhou, Guanqun and Decker, Franz-Josef and Ding, Yuantao and Jiao, Yi and Lutman, Alberto A. and Maxwell, Timothy J. and Raubenheimer, Tor O. and Wang, Jiuqing and Holman, Aaron J. and Tsai, Cheng-Ying and Wu, Jerome Y. and Wu, Weiwei and Yang, Chuan and Yoon, Moohyun and Wu, Juhao},
abstractNote = {One of the key challenges in scientific researches based on free-electron lasers (FELs) is the characterization of the coherence time of the ultra-fast hard x-ray pulse, which fundamentally influences the interaction process between x-rays and materials. Conventional optical methods, based on autocorrelation, are very difficult to realize due to the lack of mirrors. Here, we experimentally demonstrate a novel method which yields a coherence time of 174.7 attoseconds for the 6.92 keV FEL pulses at the Linac Coherent Light Source. In our experiment, a phase shifter is adopted to control the cross-correlation between x-ray and microbunched electrons. This approach provides critical diagnostics for the temporal coherence of x-ray FELs and is universal for general machine parameters; applicable for wide range of photon energy, radiation brightness, repetition rate and FEL pulse duration.},
doi = {10.1038/s41598-020-60328-4},
journal = {Scientific Reports},
number = 1,
volume = 10,
place = {United Kingdom},
year = {2020},
month = {4}
}
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Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1038/s41598-020-60328-4
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Figures / Tables:

Figure 1 Figure 1: Schematic description of hard x-ray SASE FEL coherence time measurement based on crosscorrelation between microbunched electrons and x-ray pulse. Hard x-ray SASE FEL is generated in the beforedelay undulators, then a phase shifter is employed to generate a relative delay between the electrons and the x-ray and themore » final undulator converts the correlation to x-ray pulse energy. (a) Visualizing the radiation wave and the microbunched electrons at the beginning of the phase shifter. (b) Illustrating the case that the phase shifter induced delay is small. (c) Showing that when the delay is quite large, the microbunched electrons would work with x-rays in other coherence spikes.« less
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