Abstract
The interaction of an unpolarized electron beam with a counterpropagating ultraintense linearly polarized laser pulse is investigated in the quantum radiation-dominated regime. We employ a semiclassical Monte Carlo method to describe spin-resolved electron dynamics, photon emissions and polarization, and pair production. Abundant high-energy linearly polarized gamma photons are generated intermediately during this interaction via nonlinear Compton scattering, with an average polarization degree of more than 50%, which further interacting with the laser fields produce electron-positron pairs due to nonlinear Breit-Wheeler process. The photon polarization is shown to significantly affect the pair yield by a factor beyond 10%. The considered signature of the photon polarization in the pair's yield can be experimentally identified in a prospective two-stage setup. Moreover, the signature can serve also for the polarimetry of high-energy high-flux gamma photons with a resolution well below 1% with currently achievable laser facilities.
Highlights
The interaction of an unpolarized electron beam with a counterpropagating ultraintense linearly polarized laser pulse is investigated in the quantum radiation-dominated regime
quantum electrodynamics (QED) processes become nonlinear, involving multiphoton processes [8]: A γ photon can be generated via nonlinear Compton scattering [9,10,11], or a γ photon can create an electron-positron pair in the interaction with a strong laser wave in the nonlinear BreitWheeler (BW) process [12]
In the extreme nonlinear regime, it will allow us to obtain circularly polarized brilliant γ rays via nonlinear Compton scattering from longitudinally spin-polarized electrons [49], highly sought in detecting schemes of vacuum birefringence in ultrastrong laser fields [55,56,57]
Summary
The interaction of an unpolarized electron beam with a counterpropagating ultraintense linearly polarized laser pulse is investigated in the quantum radiation-dominated regime. High-energy γ-photon polarization in nonlinear Breit-Wheeler pair production and γ polarimetry We employ a semiclassical Monte Carlo method to describe spin-resolved electron dynamics, photon emissions and polarization, and pair production.
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