The locally monochromatic approximation to QED in intense laser fields

Autor:	Heinzl, T., King, B., MacLeod, A. J.
Rok vydání:	2020
Předmět:	High Energy Physics - Phenomenology Physics - Optics Physics - Plasma Physics
Zdroj:	Phys. Rev. A 102, 063110 (2020)
Druh dokumentu:	Working Paper
DOI:	10.1103/PhysRevA.102.063110
Popis:	We derive an approximation to QED effects in strong background fields which can be employed to improve numerical simulations of laser-particle collisions. Treating the laser as a plane wave of arbitrary intensity, we split the wave into fast (carrier) and slow (envelope) modes. We solve the interaction dynamics exactly for the former while performing a local expansion in the latter. This yields a `locally monochromatic' approximation (LMA), which we compare with exact spectra for nonlinear Compton scattering and nonlinear Breit-Wheeler pair production, for realistic laser pulse durations. We show that, as an improvement over the commonly used `locally-constant field' approximation, the LMA exactly reproduces the correct low energy behaviour of particle spectra, as well as the position and amplitude of harmonic features. Comment: 19 pages, 7 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2004.13035 Zobrazit plný text záznamu View this record from Arxiv