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Quantifying electron cascade size in various irradiated materials for free-electron laser applications
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SYSNO ASEP 0579817 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Quantifying electron cascade size in various irradiated materials for free-electron laser applications Author(s) Lipp, V. (DE)
Milov, I. (NL)
Medvedev, Nikita (UFP-V) ORCIDNumber of authors 3 Source Title Journal of Synchrotron Radiation. - : Oxford Blackwell - ISSN 0909-0495
Roč. 29, March (2022), s. 323-330Number of pages 8 s. Language eng - English Country GB - United Kingdom Keywords electron cascades ; electron transport ; Monte Carlo ; photon-induced cascade ; X-ray free-electron lasers Subject RIV BH - Optics, Masers, Lasers OECD category Optics (including laser optics and quantum optics) R&D Projects EF16_013/0001552 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) LTT17015 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Method of publishing Open access Institutional support UFP-V - RVO:61389021 UT WOS 000765703500006 EID SCOPUS 85125849906 DOI 10.1107/S1600577522000339 Annotation Studying electron- and X-ray-induced electron cascades in solids is essential for various research areas at free-electron laser facilities, such as X-ray imaging, crystallography, pulse diagnostics or X-ray-induced damage. To better understand the fundamental factors that define the duration and spatial size of such cascades, this work investigates the electron propagation in ten solids relevant for the applications of X-ray lasers: Au, B4C, diamond, Ni, polystyrene, Ru, Si, SiC, Si3N4and W. Using classical Monte Carlo simulation in the atomic approximation, we study the dependence of the cascade size on the incident electron or photon energy and on the target parameters. The results show that an electron-induced cascade is systematically larger than a photon-induced cascade. Moreover, in contrast with the common assumption, the maximal cascade size does not necessarily coincide with the electron range. It was found that the cascade size can be controlled by careful selection of the photon energy for a particular material. Photon energy, just above an ionization potential, can essentially split the absorbed energy between two electrons (photo- and Auger), reducing their initial energy and thus shrinking the cascade size. This analysis suggests a way of tailoring the electron cascades for applications requiring either small cascades with a high density of excited electrons or large-spread cascades with lower electron densities. Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2024 Electronic address https://journals.iucr.org/s/issues/2022/02/00/gb5123/gb5123.pdf
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