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Journal Articles Journal of Plasma Physics Year : 2023

Vlasov-Maxwell equations with spin effects

Abstract

We present a numerical method to solve the Vlasov-Maxwell equations for spin-1/2 particles, in a semiclassical approximation where the orbital motion is treated classically while the spin variable is fully quantum. Unlike the spinless case, the phase-space distribution function is a 2 × 2 matrix, which can also be represented, in the Pauli basis, as one scalar function f 0 and one three-component vector function f. The relationship between this "vectorial" representation and the fully scalar representation on an extended phase space first proposed by Brodin et al. [Phys. Rev. Lett. 101, 245002 (2008)] is analyzed in detail. By means of suitable approximations and symmetries, the vectorial spin-Vlasov-Maxwell model can be reduced to two-dimensions in the phase space, which is amenable to numerical solutions using a high-order grid-based Eulerian method. The vectorial model enjoys a Poisson structure that paves the way to accurate Hamiltonian split-time integrators. As an example, we study the stimulated Raman scattering of an electromagnetic wave interacting with an underdense plasma, and compare the results to those obtained earlier with the scalar spin-Vlasov-Maxwell model and a particle-in-cell code. Contents
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Dates and versions

hal-03960201 , version 1 (27-01-2023)

Identifiers

Cite

Nicolas Crouseilles, Paul-Antoine Hervieux, Xue Hong, Giovanni Manfredi. Vlasov-Maxwell equations with spin effects. Journal of Plasma Physics, 2023, 89 (2), pp.article n° 905890215; PII S0022377823000314. ⟨10.1017/S0022377823000314⟩. ⟨hal-03960201⟩
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