scholarly journals Dominance of γ-γ electron-positron pair creation in a plasma driven by high-intensity lasers

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Yutong He ◽  
Thomas G. Blackburn ◽  
Toma Toncian ◽  
Alexey V. Arefiev
Keyword(s):  
High Intensity ◽  
Quantum Electrodynamics ◽  
Linear Process ◽  
Pair Creation ◽  
Jet Formation ◽  
Beam Laser ◽  
Electron Positron ◽  
Electrons And Positrons ◽  
Laser Facility ◽  
Basic Prediction

AbstractCreation of electrons and positrons from light alone is a basic prediction of quantum electrodynamics, but yet to be observed. Our simulations show that the required conditions are achievable using a high-intensity two-beam laser facility and an advanced target design. Dual laser irradiation of a structured target produces high-density γ rays that then create > 108 positrons at intensities of 2 × 1022 Wcm−2. The unique feature of this setup is that the pair creation is primarily driven by the linear Breit-Wheeler process (γγ → e+e−), which dominates over the nonlinear Breit-Wheeler and Bethe-Heitler processes. The favorable scaling with laser intensity of the linear process prompts reconsideration of its neglect in simulation studies and also permits positron jet formation at experimentally feasible intensities. Simulations show that the positrons, confined by a quasistatic plasma magnetic field, may be accelerated by the lasers to energies >200 MeV.

scholarly journals Numerical study of positron production with short-pulse high-intensity lasers

2014 ◽  
Vol 32 (1) ◽  
pp. 171-176 ◽  
Author(s):  
Vaclav Hanus ◽  
Ladislav Drska ◽  
Emmanuel d'Humieres ◽  
Vladimir Tikhonchuk
Keyword(s):  
High Intensity ◽  
Numerical Study ◽  
Short Pulse ◽  
Positron Beam ◽  
Absolute Number ◽  
Particle In Cell ◽  
Electron Positron ◽  
Electrons And Positrons ◽  
High Intensity Laser ◽  
Intensity Laser

AbstractOne-dimensional particle-in-cell and Monte-Carlo (FLUKA) simulation methods were used together, in order to investigate the production of positrons in lead targets, illuminated by a short-pulse high-intensity laser. The study is focused on lead targets of 1 mm thickness and more and pulses of intensity in the range 1019–1022 W/cm2. The calculations provided an estimate of an absolute number of positrons and the ratio of electrons and positrons emerging from the target. The thickness of the target is scaled in order to find an optimal thickness that could provide a neutral electron-positron beam.

scholarly journals QED in the clothed-particle representation: a fresh look at positronium properties treatment

2020 ◽  
Author(s):  
Yan Kostylenko ◽  
Adam Arslanaliev ◽  
Aleksandr V. Shebeko
Keyword(s):  
Decay Rate ◽  
Distinctive Feature ◽  
Ground State ◽  
Quantum Electrodynamics ◽  
Bound States ◽  
Analytical Expression ◽  
New Family ◽  
Electron Positron ◽  
Electrons And Positrons

We have extended our previous applications of the method of unitary clothing transformations (UCTs) in mesodynamics [1,2] to quantum electrodynamics (QED) [3,4]. An analytical expression for the QED Hamiltonian in the clothed-particle representation (CPR) has been derived. Its distinctive feature is the appearance of a new family of the Hermitian and energy independent interaction operators built up in the e^2e2-order for the clothed electrons and positrons instead the primary canonical interaction between electromagnetic and electron-positron fields. The problem of describing the bound states in QED in case of the positronium system has been considered. The first correction to the energy of the ground state of the para-positronium and its decay rate to two photons has been calculated by using the new interaction operators.

SIMULTANEOUS CREATION OF ELECTRON–POSITRON PAIRS AND PHOTONS IN ROBERTSON–WALKER UNIVERSES WITH STATICALLY BOUNDED EXPANSION

1992 ◽  
Vol 07 (12) ◽  
pp. 2695-2712 ◽  
Author(s):  
K.-H. LOTZE
Keyword(s):  
Quantum Electrodynamics ◽  
Particle Creation ◽  
Conformally Flat ◽  
Coupling Constant ◽  
Zeroth Order ◽  
Attenuation Effect ◽  
Interacting Particle ◽  
Electron Positron ◽  
Electrons And Positrons ◽  
Bounded Expansion

We present, based upon quantum electrodynamics in Robertson–Walker flat universes, a thorough analysis of the creation of mutually interacting electron–positron pairs and photons from vacuum. Therefore we discuss at least qualitatively all processes contributing to the number densities of created particles up to the second order in the coupling constant. For two particular expansion laws with Minkowskian in respectively in and out regions, we obtain exact solutions to the Dirac equation and investigate in detail the process of simultaneous creation of electron–positron pairs and photons and the related attenuation effect for fermionic particles. This is done for electrons and positrons which have nonrelativistic momenta at Compton time in rapidly expanding universes. The results are compared with the zeroth-order creation of electron–positron pairs. Despite being smaller by a factor of roughly [Formula: see text], the interacting-particle creation is important mainly as a source of photons even in conformally flat universes.

Vacuum polarization and particle creation in the presence of a potential step

2016 ◽  
Vol 31 (02n03) ◽  
pp. 1641031 ◽  
Author(s):  
S. P. Gavrilov ◽  
D. M. Gitman
Keyword(s):  
Electric Potential ◽  
Canonical Quantization ◽  
Particle Creation ◽  
Pair Creation ◽  
Dirac Field ◽  
Potential Step ◽  
Electron Positron ◽  
Physical Impact ◽  
Particle Interpretation ◽  
Electron Positron Pair

We consider QED with strong external backgrounds that are concentrated in restricted space areas. The latter backgrounds represent a kind of spatial x-electric potential steps for charged particles. They can create particles from the vacuum, the Klein paradox being closely related to this process. We describe a canonical quantization of the Dirac field with x-electric potential step in terms of adequate in- and out-creation and annihilation operators that allow one to have consistent particle interpretation of the physical system under consideration and develop a nonperturbative (in the external field) technics to calculate scattering, reflection, and electron-positron pair creation. We resume the physical impact of this development.

Progress on the XG-III high-intensity laser facility with three synchronized beams

2015 ◽  
Author(s):  
Jingqin Su ◽  
Qihua Zhu ◽  
Na Xie ◽  
Kainan Zhou ◽  
Xiaojun Huang ◽  
...  
Keyword(s):  
High Intensity ◽  
High Intensity Laser ◽  
Laser Facility ◽  
Intensity Laser
Sign in / Sign up

Export Citation Format

Share Document