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: Inst Plasma Phys & Laser Microfus, Warsaw, Poland; Czech Tech Univ, Fac Nucl Sci & Phys Engn, Prague 11519, Czech Republic; Czech Acad Sci, Inst Plasma Phys, Prague 18200, Czech Republic; RAS, PN Lebedev Phys Inst, Moscow 119991, Russia; Natl Res Nucl Univ MEPhI, Moscow 115409, Russia; Univ Bordeaux, CNRS, CEA, CELIA,UMR 5107, F-33405 Talence, France; Czech Acad Sci, Inst Phys, ELI Beamlines, Dolni Brezany 25241, Czech Republic; Czech Acad Sci, Inst Phys, Dept Radiat & Chem Phys, Prague 18221, Czech Republic; Fac Elect Engn CTU, Prague 16627, Czech Republic; CNR, Natl Inst Opt, Pisa, Italy; Univ York, York Plasma Phys Inst, York, N Yorkshire, England.

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.

Journal/Review: PLASMA PHYSICS AND CONTROLLED FUSION

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

More Information: The authors greatly appreciate discussions with V Tikhonchuk. This research was supported by the Access to the PALS RI under the EU LASERLAB IV project (Grant Agreement No. 654148); by the Ministry of Science and Higher Education, Republic of Poland (Decision no. 3880/H2020/2018/2), by the Ministry of Education, Youth and Sports of the Czech Republic (projects No. LM2015083 (PALS RI) and No.EF16_013/0001552) and by the Czech Science Foundation (Grant Nos. 19-24619S). The work was partially supported by the MEPhI Academic Excellence Project (contract No. 02.a03.21.0005, 27.08.2013) and Russian Science Foundation (Project No. 16-11-10174). The work was partially supported by the project #FSWU-2020-0035 (Ministry of Science and Higher Education of the Russian Federation). We acknowledge HPC resources of CINES under allocation 2017-056129 made by Grand Equipment National de Calcul Intensif and resources of NRNU MEPhI HighPerformance Computing Center. This research has been carried out within the framework of the EUROfusion Enabling Research Project: ENR-IFE19.CEA-01´Study of Direct Drive and Shock Ignition for IFE: Theory, Simulations, Experiments, Diagnostics Development´. The views and opinions expressed herein do not necessarily reflect those of the European Commission.
KeyWords: hot electrons, laser plasma, plasma, complex interferometry, polarimetry, inertial confinement fusion
DOI: 10.1088/1361-6587/abb74b

ImpactFactor: 2.458
Citations: 17
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