2D MHD simulation of spontaneous magnetic fields generated during interaction of 1315.2-nm laser radiation with copper slabs at 1016 W/cm2

Multidimensional modeling of phenomena and processes occurring during the expansion laser-produced plasma for different irradiation conditions related to both laser beam parameters target constructions is a very complex issue, especially when requires consideration kinetic associated with development various types microscopic instability. PIC codes create such possibility, but their use limited even in narrow timescale due computational capabilities current supercomputers. For this reason, paper attempts interpret results spontaneous magnetic field (SMF) measurements obtained PALS (Prague Asterix Laser System) experiment [Pisarczyk et al., AIP Adv. 10, 115201 (2020); Pisarczyk Phys. Plasmas 22, 102706 (2015)] based on 2D magneto-hydrodynamic (MHD) model [Jach Computer Modeling Dynamic Interaction Bodies by Free Point Method (PWN, Warsaw, 2011)]. The MHD equations were used included arbitrary (i) hot electrons treating it as an additional external (ii) ion-sound instability responsible increase anomalous resistance areas high temperature low-density plasma. spatial distribution fields density from are acceptable agreement experimental Plasma Controlled Fusion 62, 115020 Zaraś-Szydłowska (2015)]. inclusion temporal changes allowed us explain persistence SMF amplitude at level several megagauss after pulse ended effect freezing.