Abstract
Multidimensional modeling of phenomena and processes occurring during the expansion of the laser-produced plasma for different irradiation conditions related to both the laser beam parameters and the target constructions is a very complex issue, especially when modeling requires consideration of kinetic processes associated with the development of various types of microscopic instability. Multidimensional PIC codes create such a possibility, but their use is limited to modeling phenomena even in a very narrow timescale due to the limited computational capabilities of current supercomputers. For this reason, the paper attempts to interpret the results of the spontaneous magnetic field (SMF) measurements obtained during the PALS (Prague Asterix Laser System) experiment [Pisarczyk et al., AIP Adv. 10, 115201 (2020); Pisarczyk et al., Phys. Plasmas 22, 102706 (2015)] based on the 2D magneto-hydrodynamic (MHD) model [Jach et al., Computer Modeling of Dynamic Interaction of Bodies by Free Point Method (PWN, Warsaw, 2011)]. The MHD equations were used with included arbitrary (i) current of hot electrons treating it as an additional external current and (ii) ion-sound instability responsible for the increase in anomalous resistance in areas with high temperature and low-density plasma. The spatial distribution of magnetic fields and current density obtained from 2D modeling are in acceptable agreement with the experimental results [Pisarczyk et al., Plasma Phys. Controlled Fusion 62, 115020 (2020); Zaraś-Szydłowska et al., AIP Adv. 10, 115201 (2020); Pisarczyk et al., Phys. Plasmas 22, 102706 (2015)]. The inclusion of temporal changes in anomalous resistance in modeling allowed us to explain the persistence of high SMF amplitude at the level of several megagauss after the laser pulse ended due to the effect of magnetic field freezing.
Highlights
Generation of spontaneous magnetic fields (SMF) plays an important role in the understanding of various phenomena and processes associated with the interaction of laser radiation with matter and it enables identifying currents of various origins in nonequilibrium laser-produced plasma
The paper attempts to interpret the results of the spontaneous magnetic field (SMF) measurements obtained during the PALS (Prague Asterix Laser System) experiment [Pisarczyk et al, AIP Adv. 10, 115201 (2020); Pisarczyk et al, Phys
Such an interesting area of research is the use of SMF for the generation of magnetized plasma streams, which can be useful both in research related to the implementation of inertial fusion (ICF)3–5 and in laboratory astrophysics
Summary
Generation of spontaneous magnetic fields (SMF) plays an important role in the understanding of various phenomena and processes associated with the interaction of laser radiation with matter and it enables identifying currents of various origins in nonequilibrium laser-produced plasma These fields affect many aspects of plasma behavior that modify transport of charged particle species and spatial and temporal distributions of their density and temperature, defining the physics of the interaction processes, and due to this, they still remain the current trend related to high-density energy physics. Such an interesting area of research is the use of SMF for the generation of magnetized plasma streams, which can be useful both in research related to the implementation of inertial fusion (ICF) and in laboratory astrophysics.. One of the new ideas in this field is the use of optical generators based on capacitor-coil targets to magnetize laser–plasma streams
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