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Radiation beaming in the quantum regime

Journal article
Authors Tom Blackburn
D. Seipt
S. S. Bulanov
Mattias Marklund
Published in Physical Review A
Volume 101
Issue 1
Pages 8
ISSN 2469-9926
Publication year 2020
Published at Department of Physics (GU)
Pages 8
Language en
Links dx.doi.org/10.1103/PhysRevA.101.012...
Keywords laser, physics, photon, pw, Optics, Physics
Subject categories Physical Sciences

Abstract

Classical theories of radiation reaction predict that the electron motion is confined to the plane defined by the electron's instantaneous momentum and the force exerted by the external electromagnetic field. However, in the quantum radiation reaction regime, where the recoil exerted by individual quanta becomes significant, the electron can scatter "out of plane," as the photon is emitted into a cone with finite opening angle. We show that Monte Carlo implementation of an angularly resolved emission rate leads to substantially improved agreement with exact QED calculations of nonlinear Compton scattering. Furthermore, we show that the transverse recoil caused by this finite beaming, while negligible in many high-intensity scenarios, can be identified in the increase in divergence, in the plane perpendicular to the laser polarization and wave vector, of a high-energy electron beam that interacts with a linearly polarized, ultraintense laser.

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