Phase control of nonlinear Breit-Wheeler pair creation

Author:

Barbosa B.1ORCID,Vranic M.1ORCID,Weichman K.2ORCID,Ramsey D.2ORCID,Palastro J. P.2ORCID

Affiliation:

1. GoLP/Instituto de Plasmas e Fusão Nuclear, Universidade de Lisboa, 1049–001 Lisbon, Portugal

2. Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623, USA

Abstract

Electron-positron pair creation occurs throughout the universe in the environments of extreme astrophysical objects, such as pulsar magnetospheres and black hole accretion disks. The difficulty of emulating these environments in the laboratory has motivated the use of ultrahigh-intensity laser pulses for pair creation. Here we show that the phase offset between a laser pulse and its second harmonic can be used to control the relative transverse motion of electrons and positrons created in the nonlinear Breit-Wheeler process. Analytic theory and particle-in-cell simulations of a head-on collision between a two-color laser pulse and electron beam predict that with an appropriate phase offset, the electrons will drift in one direction and the positrons in the other. The resulting current may provide a collective signature of nonlinear Breit-Wheeler, while the spatial separation resulting from the relative motion may facilitate isolation of positrons for subsequent applications or detection. Published by the American Physical Society 2024

Funder

Fundação para a Ciência e a Tecnologia

Fusion Energy Sciences

National Nuclear Security Administration

University of Rochester

New York State Energy Research and Development Authority

Publisher

American Physical Society (APS)

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