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Title: Time-dependent wave front propagation simulation of a hard x-ray split-and-delay unit: Towards a measurement of the temporal coherence properties of x-ray free electron lasers

Abstract

For the European x-ray free electron laser (XFEL) a split-and-delay unit based on geometrical wavefront beam splitting and multilayer mirrors is built which covers the range of photon energies from 5 keV up to 20 keV. Maximum delays between Δτ = ±2.5 ps at hν=20 keV and up to Δτ = ±23 ps at hν = 5 keV will be possible. Time-dependent wave-optics simulations have been performed by means of Synchrotron Radiation Workshop software for XFEL pulses at hν = 5 keV. The XFEL radiation was simulated using results of time-dependent simulations applying the self-amplified spontaneous emission code FAST. Main features of the optical layout, including diffraction on the beam splitter edge and optics imperfections measured with a nanometer optic component measuring machine slope measuring profiler, were taken into account. The impact of these effects on the characterization of the temporal properties of XFEL pulses is analyzed. An approach based on fast Fourier transformation allows for the evaluation of the temporal coherence despite large wavefront distortions caused by the optics imperfections. In this manner, the fringes resulting from time-dependent two-beam interference can be filtered and evaluated yielding a coherence time of τc = 0.187 fs (HWHM) for real, nonperfect mirrors,more » while for ideal mirrors a coherence time of τc = 0.191 fs (HWHM) is expected.« less

Authors:
 [1];  [1];  [2];  [2];  [2];  [3];  [4];  [5];  [5];  [6];  [7];  [7]
  1. Westfalische Wilhelms-Univ., Munster (Germany)
  2. European XFEL GmbH, Hamburg (Germany)
  3. Brookhaven National Lab. (BNL), Upton, NY (United States)
  4. Shubnikov Institute of Crystallography RAS, Moscow (Russia)
  5. Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
  6. Helmholtz-Zentrum Berlin fur Materialien und Energie, Berlin (Germany)
  7. Fraunhofer IWS, Dresden (Germany)
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1341501
Report Number(s):
BNL-108280-2015-JA
Journal ID: ISSN 1098-4402; PRABFM; R&D Project: LS001
Grant/Contract Number:  
SC00112704
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Special Topics. Accelerators and Beams
Additional Journal Information:
Journal Volume: 17; Journal Issue: 11; Journal ID: ISSN 1098-4402
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Roling, S., Zacharias, H., Samoylova, L., Sinn, H., Tschentscher, Th., Chubar, O., Buzmakov, A., Schneidmiller, E., Yurkov, M. V., Siewert, F., Braun, S., and Gawlitza, P. Time-dependent wave front propagation simulation of a hard x-ray split-and-delay unit: Towards a measurement of the temporal coherence properties of x-ray free electron lasers. United States: N. p., 2014. Web. doi:10.1103/PhysRevSTAB.17.110705.
Roling, S., Zacharias, H., Samoylova, L., Sinn, H., Tschentscher, Th., Chubar, O., Buzmakov, A., Schneidmiller, E., Yurkov, M. V., Siewert, F., Braun, S., & Gawlitza, P. Time-dependent wave front propagation simulation of a hard x-ray split-and-delay unit: Towards a measurement of the temporal coherence properties of x-ray free electron lasers. United States. doi:10.1103/PhysRevSTAB.17.110705.
Roling, S., Zacharias, H., Samoylova, L., Sinn, H., Tschentscher, Th., Chubar, O., Buzmakov, A., Schneidmiller, E., Yurkov, M. V., Siewert, F., Braun, S., and Gawlitza, P. Tue . "Time-dependent wave front propagation simulation of a hard x-ray split-and-delay unit: Towards a measurement of the temporal coherence properties of x-ray free electron lasers". United States. doi:10.1103/PhysRevSTAB.17.110705. https://www.osti.gov/servlets/purl/1341501.
@article{osti_1341501,
title = {Time-dependent wave front propagation simulation of a hard x-ray split-and-delay unit: Towards a measurement of the temporal coherence properties of x-ray free electron lasers},
author = {Roling, S. and Zacharias, H. and Samoylova, L. and Sinn, H. and Tschentscher, Th. and Chubar, O. and Buzmakov, A. and Schneidmiller, E. and Yurkov, M. V. and Siewert, F. and Braun, S. and Gawlitza, P.},
abstractNote = {For the European x-ray free electron laser (XFEL) a split-and-delay unit based on geometrical wavefront beam splitting and multilayer mirrors is built which covers the range of photon energies from 5 keV up to 20 keV. Maximum delays between Δτ = ±2.5 ps at hν=20 keV and up to Δτ = ±23 ps at hν = 5 keV will be possible. Time-dependent wave-optics simulations have been performed by means of Synchrotron Radiation Workshop software for XFEL pulses at hν = 5 keV. The XFEL radiation was simulated using results of time-dependent simulations applying the self-amplified spontaneous emission code FAST. Main features of the optical layout, including diffraction on the beam splitter edge and optics imperfections measured with a nanometer optic component measuring machine slope measuring profiler, were taken into account. The impact of these effects on the characterization of the temporal properties of XFEL pulses is analyzed. An approach based on fast Fourier transformation allows for the evaluation of the temporal coherence despite large wavefront distortions caused by the optics imperfections. In this manner, the fringes resulting from time-dependent two-beam interference can be filtered and evaluated yielding a coherence time of τc = 0.187 fs (HWHM) for real, nonperfect mirrors, while for ideal mirrors a coherence time of τc = 0.191 fs (HWHM) is expected.},
doi = {10.1103/PhysRevSTAB.17.110705},
journal = {Physical Review Special Topics. Accelerators and Beams},
number = 11,
volume = 17,
place = {United States},
year = {2014},
month = {11}
}

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    Works referencing / citing this record:

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