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  Relativistic Modeling of Ultra-Short Electron Pulse Propagation

Kochikov, I. V., Miller, R. J. D., & Ischenko, A. A. (2019). Relativistic Modeling of Ultra-Short Electron Pulse Propagation. Journal of Experimental and Theoretical Physics - JETP, 128(3), 333-340. doi:10.1134/S1063776119020201.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0003-BD3C-6 Version Permalink: http://hdl.handle.net/21.11116/0000-0003-BD3D-5
Genre: Journal Article

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Kochikov2019_Article_RelativisticModelingOfUltra-Sh.pdf (Publisher version), 2MB
 
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https://dx.doi.org/10.1134/S1063776119020201 (Publisher version)
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 Creators:
Kochikov, I. V.1, Author
Miller, R. J. D.2, 3, 4, Author              
Ischenko, A. A.5, Author
Affiliations:
1Moscow State University, Research Computing Center, ou_persistent22              
2Miller Group, Atomically Resolved Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_1938288              
3Hamburg Centre for Ultrafast Imaging, ou_persistent22              
4Departments of Chemistry and Physics, University of Toronto, ou_persistent22              
5Russian Technological University MIREA, Moscow, ou_persistent22              

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 Abstract: The ultrafast electron microscopy, electron diffraction, electron crystallography, and nanocrystallography methods opened the possibility of studying the coherent structural dynamics of matter. The time resolution of the ultrafast electron microscopy and electron diffraction methods determined by the duration of electron pulses is the key parameter of experimental setups. This paper treats electron pulse dynamics in the field free drift region specifically for applications in atomic imaging. The electron beam is modeled as a system of particles (N) with N = 1000 and N = 10 000 electrons. The beam propagates for a certain period of time (1–4 ns); during its propagation, electron distribution parameters (over coordinates and velocities) are calculated to characterize the temporal profile and uncertainty in the electron wavelength at the sample. The results of applying relativistic dynamic equations show that nonrelativistic results are satisfactorily applicable (with 15 per cent or better accuracy) for modeling short electron pulse elongation and broadening at 30 keV and lower energies. However, the results of such modeling may be significantly in error for intermediate energies (300 keV), and for the fast relativistic beams (3 MeV) they become completely wrong. The relative reduction in Coulomb repulsion effects at higher energies is known, however; we give a comprehensive treatment that allows a quantitative picture. Using high-energy electron pulses results in almost complete elimination of the repulsive Coulomb effect. Dispersion of electron velocities becomes much lower at higher energies. For 3 MeV electrons, electron pulse duration as well as its radius does not noticeably change even after traveling for 4 ns (1.2 m). Even at 300 keV, the pulse duration increase is negligible until 1 ns (0.2 m). A simple mean-field model suggested in [13] has been extended to arbitrarily fast relativistic electron pulses with good correspondence to direct dynamic modeling.

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Language(s): eng - English
 Dates: 2018-09-142018-06-292018-09-172019-05-282019-03
 Publication Status: Published in print
 Pages: 8
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 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1134/S1063776119020201
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Project name : I.V. Kochikov and A.A. Ischenko acknowledges support by the Russian Foundation for Basic Research (project no. 16-29-1167 OFI_m) and partial support by the project no. 14-22-02035 OFI_m. R.J. Dwayne Miller would like to thank the Max Planck Society for support.
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Title: Journal of Experimental and Theoretical Physics - JETP
  Other : J. Exp. Theor. Phys.
Source Genre: Journal
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Publ. Info: New York, NY : American Institute of Physics
Pages: 8 Volume / Issue: 128 (3) Sequence Number: - Start / End Page: 333 - 340 Identifier: ISSN: 1063-7761
CoNE: https://pure.mpg.de/cone/journals/resource/954926954827