Generalizing the Sokolov-Ternov effect in intense laser fields
2019
A consistent description of the radiative polarization for relativistic electrons in intense laser fields is derived by generalizing the Sokolov-Ternov effect in arbitrary field structure. The new form together with the spin-dependent radiation-reaction force provide a complete set of dynamical equations for electron momentum and spin in strong fields. When applied to varying intense fields, e.g. the laser fields, the generalized Sokolov-Ternov effect allows electrons to gain or lose polarization in any directions other than along the magnetic field in the rest frame of the electron. The self-consistent theory shows that highly relativistic electrons can obtain notable polarization in collision with an ultra-intense circularly polarized laser beam.
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