Electron-Angular-Distribution Reshaping in Quantum Radiation-Dominated Regime

Abstract

Dynamics of an electron beam head-on colliding with an ultraintense focused ultrashort circularly-polarized laser pulse are investigated in the quantum radiation-dominated regime. Generally, the ponderomotive force of the laser fields may deflect the electrons transversely, to form a ring structure on the cross-section of the electron beam. However, we find that when the Lorentz factor of the electron $\gamma$ is approximately one order of magnitude larger than the invariant laser field parameter $\xi$, the stochastic nature of the photon emission leads to electron aggregation abnormally inwards to the propagation axis of the laser pulse. Consequently, the electron angular distribution after the interaction exhibits a peak structure in the beam propagation direction, which is apparently distinguished from the "ring"-structure of the distribution in the classical regime, and therefore, can be recognized as a proof of the fundamental quantum stochastic nature of radiation. The stochasticity signature is robust with respect to the laser and electron parameters and observable with current experimental techniques.

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Cited by in corpus (3)

• Radiation beaming in the quantum regime
• Quantum-stochasticity-induced asymmetry in angular distribution of electrons in a quasi-classical regime
• Imprint of the stochastic nature of photon emission by electrons on the proton energy spectra in the laser-plasma interaction