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The role of standing wave in the generation of hot electrons by femtosecond laser beams incident on dense ionized target
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SYSNO ASEP 0555696 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title The role of standing wave in the generation of hot electrons by femtosecond laser beams incident on dense ionized target Author(s) Babjak, Róbert (UFP-V)
Pšikal, J. (CZ)Number of authors 2 Article number 023107 Source Title Physics of Plasmas - ISSN 1070-664X
Roč. 28, č. 2 (2021)Number of pages 14 s. Language eng - English Country US - United States Keywords wave ; femtosecond ; dense ionized target Subject RIV BH - Optics, Masers, Lasers OECD category Optics (including laser optics and quantum optics) R&D Projects EF16_019/0000778 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Method of publishing Limited access Institutional support UFP-V - RVO:61389021 UT WOS 000630455900001 EID SCOPUS 85101024922 DOI 10.1063/5.0031555 Annotation We demonstrate the differences in hot electron absorption mechanisms dominant in the interaction of a femtosecond laser pulse with intensities of 10 18 W / cm2 and 10 21 W / cm2 on a fully ionized target with a steep density profile and preplasma with moderate scale length (3 μm). We show that acceleration of each electron starts at the moment when the magnetic component of a standing electromagnetic wave changes its polarity in a regime without preplasma. In the presence of preplasma, the stochastic heating is the dominant absorption mechanism along with the longitudinal electric field. It is observed that wave's energy is absorbed only if the standing wave is already created at the position of electron during the interaction with the pulse with an intensity of 10 18 W / cm2. In the case with 10 21 W / cm2 intensity, the part of the electrons is pre-accelerated in front of the target before the reflection and following stochastic heating. The presence of preplasma results in electron temperatures close to or even exceeding ponderomotive scaling. At higher intensity, the re-injection of electrons previously repelled by incident wave's ponderomotive force into high-field regions is allowed if the standing wave is created. Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2022 Electronic address https://aip.scitation.org/doi/10.1063/5.0031555
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