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Applied Physics B

, Volume 118, Issue 3, pp 417–429 | Cite as

Femtosecond X-ray induced electron kinetics in dielectrics: application for FEL-pulse-duration monitor

  • Nikita MedvedevEmail author
Article

Abstract

Modern X-ray free-electron lasers (FELs) provide pulses with photon energies from a few tens of eV up to the tens of keV and durations as short as only a few femtoseconds. Experimental pump–probe scheme with a FEL pump and a visible light probe of a solid-state target can be used for the pulse-duration monitor on a shot-to-shot basis. To study the electron cascading in different materials used for pulse-duration monitor, XCASCADE, a Monte Carlo model of the X-ray-induced electron cascading within an irradiated target is developed. It is shown here that the electron cascade duration is sensitive to a choice of material. An appropriately selected target can significantly shorten the electron relaxation times. The grounds, upon which such a choice of the material can be made, are discussed. The results suggest that for photon energies of 24 keV, one could achieve direct monitoring of the pulse duration of 40 fs. Further deconvolution of the electron density into the contribution from the pulse itself and from the secondary cascading can increase the resolution up to a scale of a femtosecond.

Keywords

Photon Energy Excited Electron Electron Density Increase Auger Process Photoabsorption Cross Section 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

The author is deeply thankful to Dr. A. Aquila, Dr. M. Nakatsutsumi and Prof. B. Ziaja for fruitful discussions and help with the manuscript. Helpful comments from Dr. Z. Jurek and Dr. J. Gaudin are also acknowledged. The insightful and valuable suggestions from the Reviewers of the paper helped to improve the manuscript.

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© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  1. 1.Center for Free-Electron Laser ScienceDeutsches Elektronen-Synchrotron (DESY)HamburgGermany

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