Scientific Results

Hot electron retention in laser plasma created under terawatt subnanosecond irradiation of Cu targets

Year: 2020

Authors: Pisarczyk T., Kalal M., Gus’kov S. Yu., Batani D., Renner O., Santos J., Dudzak R., Zaras-Szydłowska A., Chodukowski T., Rusiniak Z., Dostal J., Krasa J., Krupka M., Kochetkov Iu., Singh S., Cikhardt J., Burian T., Krus M., Pfeifer M., Cristoforetti G., Gizzi LA., Baffigi F., Antonelli L., Demchenko N.N.,
Rosinski M., Terwinska D., Borodziuk S., Kubes P., Ehret M., Juha L., Skala J., Korneev Ph.

Autors Affiliation: 1 Institute of Plasma Physics and Laser Microfusion, Warsaw, Poland
2 Faculty of Nuclear Science and Physics Engineering, Czech Technical University in Prague, 115 19, Prague, Czech Republic
3 Institute of Plasma Physics, Czech Academy of Sciences, 182 00, Prague, Czech Republic
4 P.N. Lebedev Physical Institute of RAS, 119991, Moscow, Russia
5 National Research Nuclear University MEPhI, 115409, Moscow, Russia
6 Univ. Bordeaux, CNRS, CEA, CELIA, UMR 5107, F-33405, Talence, France
7 ELI Beamlines, Institute of Physics, Czech Academy of Sciences, 252 41, Dolni Brezany, Czech Republic
8 Department of Radiation and Chemical Physics, Institute of Physics, Czech Academy of Sciences,
182 21, Praha, Czech Republic
9 Faculty of Electrical Engineering CTU, 166 27, Prague, Czech Republic
10 National Institute of Optics, CNR, Pisa, Italy
11 York Plasma Physics Institute, University of York, York, United Kingdom

Abstract: Laser plasma created by intense light interaction with matter plays an important role in high-energy density fundamental studies and many prospective applications. Terawatt
laser-produced plasma related to the low collisional and relativistic domain may form supersonic flows and is prone to the generation of strong spontaneous magnetic fields. The
comprehensive experimental study presented in this work provides a reference point for the theoretical description of laser-plasma interaction, focusing on the hot electron generation. It experimentally quantifies the phenomenon of hot electron retention, which serves as a boundary condition for most plasma expansion models. Hot electrons, being responsible for nonlocal thermal and electric conductivities, are important for a large variety of processes in such
plasmas. The multiple-frame complex-interferometric data providing information on time resolved spontaneous magnetic fields and electron density distribution, complemented by
particle spectra and x-ray measurements, were obtained under irradiation of the planar massive Cu and plastic-coated targets by the iodine laser pulse with an intensity of above 1016 W cm−2. The data shows that the hot electron emission from the interaction region outside the target is strongly suppressed, while the electron flow inside the target, i.e. in the direction of the incident laser beam, is a dominant process and contains almost the whole hot electron population. The obtained quantitative characterization of this phenomenon is of primary importance for plasma applications spanning from ICF to laser-driven discharge magnetic field generators.


Volume: 62 (11)      Pages from: 115020 -1  to: 115020-15

KeyWords: hot electrons, laser plasma, inertial confinement fusion
DOI: 10.1088/1361-6587/abb74b

Citations: 1
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