Numerical simulations to study turbulent magnetic field amplification by nonlinear interaction of high-power laser and kinetic Alfvén waves in laboratory and astrophysical plasmas

Abstract

The model contouring the dynamics of transient nonlinear interaction between the high-frequency extraordinary-elliptically polarized laser (HFXPL) and low-frequency kinetic Alfvén wave (LFKAW) dynamics in the magnetized plasma is the focal point of the present investigation. The quasistatic ponderomotive force driven by the HFXPL pump induces density cavitation and humps in the low-frequency kinetic Alfvén wave. In order to study the intricate localized structures of HFXPL pump waves that evolve with time, the requisite dimensionless equations of the coupled system (HFXPL and LFKAW) are evaluated by using numerical methods in the nonlinear stage. The typical scale sizes of these structures in the early phase are ∼9 μ m, and the typical time to grow is ∼10 ps. The ensemble-averaged magnetic power spectra are also presented, indicating energy cascade. The rendered investigations follow direct relevance to the experimental observations [Chatterjee et al., Rev. Sci. Instrum. 85, 013505 (2014); Romagnani et al., Phys. Rev. Lett. 122, 025001 (2019); Tzeferacos et al., Nat. Commun. 9, 591 (2018); Phys. Plasmas 24, 041404 (2017); Meinecke et al., Proc. Natl. Acad. Sci. 112, 8211 (2015); Nat. Phys. 10, 520-524 (2014); Mondal et al., Proc. Natl. Acad. Sci. 109, 8011 (2012); Chatterjee et al., Nat. Commun. 8, 15970 (2017)] and are imperative in understanding turbulence in astrophysical scenarios.