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Reaching supercritical field strengths with intense lasers

Journal article
Authors Tom Blackburn
A. Ilderton
Mattias Marklund
C. P. Ridgers
Published in New Journal of Physics
Volume 21
Issue 5
ISSN 1367-2630
Publication year 2019
Published at Department of Physics (GU)
Language en
Links dx.doi.org/10.1088/1367-2630/ab1e0d
Keywords Radiation reaction, radiative corrections, strong-field quantum electrodynamics (QED), Electrodynamics, Electron beams, Energy dissipation, Germanium compounds, Photons, Electron-positron pair creation, High energy electron beams, Perturbative approach, Quantum electrodynamics, Radiation reactions, Supercritical fields, Supercritical regime, Electrons
Subject categories Physical Sciences

Abstract

It is conjectured that all perturbative approaches to quantum electrodynamics (QED) break down in the collision of a high-energy electron beam with an intense laser, when the laser fields are boosted to supercritical strengths far greater than the critical field of QED. As field strengths increase toward this regime, cascades of photon emission and electron-positron pair creation are expected, as well as the onset of substantial radiative corrections. Here we identify the important role played by the collision angle in mitigating energy losses to photon emission that would otherwise prevent the electrons reaching the supercritical regime. Weshow that a collision between an electron beam with energy in the tens of GeV and a laser pulse of intensity 10 W cm 24 2 - at oblique, or even normal, incidence is a viable platform for studying the breakdown of perturbative strong-field QED. Our results have implications for the design of near-term experiments as they predict that certain quantum effects are enhanced at oblique incidence. © 2019 The Author(s). Published by IOP Publishing Ltd on behalf of the Institute of Physics and Deutsche Physikalische Gesellschaft.

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