New class of violation of local constant field approximation in intense crossed laser pulse scenarios

Abstract

It is commonly assumed that in ultrastrong laser fields, when the strong field parameter of the laser field $\xi$ is larger than one, the electron radiation is well described by the local constant field approximation (LCFA). We discuss the failure of this conjecture, considering radiation of an ultrarelativistic electron interacting with strong counterpropagating laser waves. A deviation from LCFA, in particular in the high-frequency domain, is shown to occur even at $\xi \gg 1$ because of the appearance of an additional small time scale in the trajectory. Moreover, we identify a new class of LCFA violation, when the radiation formation length becomes smaller than the one via LCFA. It is characterized by a broad and smooth spectrum rather than an harmonic structure. A similar phenomenon is also demonstrated in the scenario of an electron colliding with an ultrashort laser pulse. The relevance to laser-plasma kinetic simulations is discussed.

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Cited by in corpus (8)

• Charged particle motion and radiation in strong electromagnetic fields
• Electron spin- and photon polarization-resolved probabilities of strong-field QED processes
• Helicity transfer in strong laser fields via the electron anomalous magnetic moment
• High-resolution modeling of nonlinear Compton scattering in focused laser pulses
• Analytical spectrum of nonlinear Thomson scattering including radiation reaction
• High-brilliance ultra-narrow-band x-rays via electron radiation in colliding laser pulses
• Ultrarelativistic electrons in counterpropagating laser beams
• Signatures for strong-field QED in the quantum limit of beamstrahlung