Reaching supercritical field strengths with intense lasers. (29th May 2019)

• Record Type: Journal Article
• Authors: Blackburn, T G; Ilderton, A; Marklund, M; Ridgers, C P
• Is Part Of: New journal of physics. Volume 21:Number 5(2019:May)
• Publication Date: 2019-05-29
• Subjects: radiation reaction -- strong-field quantum electrodynamics (QED) -- radiative corrections; Physics -- Periodicals; Physics; Periodicals; 530.05
• DOI: 10.1088/1367-2630/ab1e0d
• Languages: English
• ISSNs: 1367-2630

Abstract

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. We show that a collision between an electron beam with energy in the tens of GeV and a laser pulse of intensity 10 24 W cm − 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.