High-energy 
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-photon polarization in nonlinear Breit-Wheeler pair production and 
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 polarimetry

Wan, Feng; Wang, Yu; Guo, Ren-Tong; Chen, Yueyue; Shaisultanov, Rashid; Xu, Zhongfeng; Hatsagortsyan, Karen Z.; Keitel, Christoph H.; Li, Jianxing

doi:10.1103/physrevresearch.2.032049

Cited by 31 publications

(28 citation statements)

References 78 publications

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“…Since the cross section of nonlinear Compton scattering is electron spin and photon polarization dependent [40], highly polarized γ rays can be generated by initially spin-polarized electrons via nonlinear Compton scattering [41]. Similarly, the cross section of nonlinear BW pair production relies on photon polarization [42] and consequently the intermediate photon polarization should be involved in simulations of nonlinear BW pair production in laser and electron-beam collisions [43,44].…”

Section: Introductionmentioning

confidence: 99%

Stochasticity in radiative polarization of ultrarelativistic electrons in an ultrastrong laser pulse

Guo

Shaisultanov

et al. 2020

Phys. Rev. Research

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Stochastic effects in the spin (de)polarization of an ultrarelativistic electron beam during photon emissions in a counterpropagating ultrastrong focused laser pulse in the quantum radiation reaction regime are investigated. We employ a Monte Carlo method to describe the electron dynamics semiclassically and photon emission and electron radiative polarization quantum mechanically. While in the latter the photon emission is inherently stochastic, we are able to identify its imprints in comparison with the semiclassical stochasticity-free method of radiative polarization applicable in the quantum regime. With an initially-spin-polarized electron beam, the impact of stochastic effects of photon emissions on the spin observable is demonstrated in the dependence of the depolarization degree on the electron scattering angle and the final electron energy (spin stochastic diffusion). With an initially unpolarized electron beam, the stochastic effects on the spin are exhibited in enhancing the known effect of splitting of the electron beam along the propagation direction into two oppositely polarized parts by an elliptically polarized laser pulse. The considered stochastic effects for the spin are observable with currently achievable laser and electron-beam parameters.

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Section: Introductionmentioning

confidence: 99%

Stochasticity in radiative polarization of ultrarelativistic electrons in an ultrastrong laser pulse

Guo

Shaisultanov

et al. 2020

Phys. Rev. Research

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“…However, in the strong-field quantum regime, χ ∼ 1, RR manifests itself in consecutive Compton events, where the electron recoil during each hard photon emission constitutes the stochastic nature of quantum radiation reaction. In addition, because Compton probabilities depend on the spin of the electrons [180], quantum RR is spin-dependent and can thus lead to radiative polarisation of electrons via spin-flip transitions [184,185].…”

Section: (B) (A)mentioning

confidence: 99%

Conceptual design report for the LUXE experiment

Abramowicz

Acosta

Altarelli

et al. 2021

Eur. Phys. J. Spec. Top.

116

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This Conceptual Design Report describes LUXE (Laser Und XFEL Experiment), an experimental campaign that aims to combine the high-quality and high-energy electron beam of the European XFEL with a powerful laser to explore the uncharted terrain of quantum electrodynamics characterised by both high energy and high intensity. We will reach this hitherto inaccessible regime of quantum physics by analysing high-energy electron-photon and photon-photon interactions in the extreme environment provided by an intense laser focus. The physics background and its relevance are presented in the science case which in turn leads to, and justifies, the ensuing plan for all aspects of the experiment: Our choice of experimental parameters allows (i) field strengths to be probed where the coupling to charges becomes non-perturbative and (ii) a precision to be achieved that permits a detailed comparison of the measured data with calculations. In addition, the high photon flux predicted will enable a sensitive search for new physics beyond the Standard Model. The initial phase of the experiment will employ an existing 40 TW laser, whereas the second phase will utilise an upgraded laser power of 350 TW. All expectations regarding the performance of the experimental set-up as well as the expected physics results are based on detailed numerical simulations throughout.

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“…In most of studies, the gamma-photon have been assumed unpolarized and the NBW probability has been averaged over the photon polarization 23,24,30,31 . In reality the intermediate gamma-photon is partially polarized, which has consequences for further pair production process 25,33,34 . In particular, the decrease of the pair density with the inclusion of photon polarization has been shown in analytical QED calculations 33 averaged by the lepton spins, which is confirmed by more accurate spin resolved Monte Carlo simulations 34 .…”

Section: Introductionmentioning

confidence: 99%

Photon polarization effects in polarized electron-positron pair production in a strong laser field

Dai

Shen

et al. 2021

Preprint

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Deep understanding of photon polarization impact on pair production is essential for the efficient creation of laser driven polarized positron beams, and demands a complete description of polarization effects in strong-field QED processes. We investigate, employing fully polarization resolved Monte Carlo simulations, the correlated photon and electron (positron) polarization effects in multiphoton Breit-Wheeler pair production process during the interaction of an ultrarelativistic electron beam with a counterpropagating elliptically polarized laser pulse. We showed that the polarization of e − e + pairs is degraded by 35%, when the polarization of the intermediate photon is resolved, accompanied with an approximately 13% decrease of the pair yield. Moreover, the polarization direction of energetic positrons in small angle region is reversed, which originates from the pair production of hard photons with polarization parallel with electric field.

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High-energy γ -photon polarization in nonlinear Breit-Wheeler pair production and γ polarimetry

Cited by 31 publications

References 78 publications

Stochasticity in radiative polarization of ultrarelativistic electrons in an ultrastrong laser pulse

Stochasticity in radiative polarization of ultrarelativistic electrons in an ultrastrong laser pulse

Conceptual design report for the LUXE experiment

Photon polarization effects in polarized electron-positron pair production in a strong laser field

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