Benchmarking semiclassical approaches to strong-field QED: Nonlinear Compton scattering in intense laser pulses

被引：57

作者：

Blackburn, T. G. ^{[1
]}

Seipt, D. ^{[2
,3
]}

Bulanov, S. S. ^{[4
]}

Marklund, M. ^{[1
]}

机构：

[1] Chalmers Univ Technol, Dept Phys, SE-41296 Gothenburg, Sweden

[2] Univ Lancaster, Phys Dept, Lancaster LA1 4YB, England

[3] Daresbury Lab, Cockcroft Inst, Warrington WA4 4AD, Cheshire, England

[4] Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA

来源：

PHYSICS OF PLASMAS | 2018年 / 25卷 / 08期

基金：

瑞典研究理事会; 英国科学技术设施理事会;

关键词：

QUANTUM RADIATION REACTION; ELECTRON; PHOTON; PLASMA;

D O I：

10.1063/1.5037967

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

The recoil associated with photon emission is key to the dynamics of ultrarelativistic electrons in strong electromagnetic fields, as found in high-intensity laser-matter interactions and astrophysical environments such as neutron star magnetospheres. When the energy of the photon becomes comparable to that of the electron, it is necessary to use quantum electrodynamics (QED) to describe the dynamics accurately. However, computing the appropriate scattering matrix element from strong-field QED is not generally possible due to multiparticle effects and the complex structure of the electromagnetic fields. Therefore, these interactions are treated semiclassically, coupling probabilistic emission events to classical electrodynamics using rates calculated in the locally constant field approximation. Here, we provide comprehensive benchmarking of this approach against the exact QED calculation for nonlinear Compton scattering of electrons in an intense laser pulse. We find agreement at the percentage level between the photon spectra, as well as between the models' predictions of absorption from the background field, for normalized amplitudes a(0) > 5. We discuss possible routes towards improved numerical methods and the implications of our results for the study of QED cascades. (C) 2018 Author(s).

引用

页数：11

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