Magnetic Field Generation Through Angular Momentum Exchange Between Circularly Polarized Radiation And Charged Particles
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Magnetic Field Generation Through Angular Momentum Exchange Between Circularly Polarized Radiation and Charged Particles
The interaction between circularly polarized (CP) radiation and charged particles can lead to generation of magnetic field through an inverse Faraday effect. The spin of the circularly polarized electromagnetic wave can be converted into the angular momentum of the charged particles so long as there is dissipation. We demonstrate this by considering two mechanisms of angular momentum absorption relevant for laser-plasma interactions: electron-ion collisions and ionization. The precise dissipative mechanism, however, plays a role in determining the efficiency of the magnetic field generation.