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Daniel Seipt26/08/2024, 09:10
A tutorial focussing on the theory of strong field QED - more details to follow.
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Tom Blackburn (University of Gothenburg)26/08/2024, 10:25
Numerical simulations are an essential tool in plasma physics: they help us understand the dynamics of complex systems, interpret experimental results, and design novel radiation and particle sources. This is especially true in the high-intensity regime, where strong-field QED interactions affect, and are affected by, classical, collective plasma processes. In this talk I will give a tutorial...
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Henri Vincenti26/08/2024, 11:35
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Sebastian Meuren26/08/2024, 15:30
QED is often considered the most successful theory in physics, as it permits extremely precise predictions in the perturbative regime. In this tutorial talk, we will review experiments that focus coherent laser light into such small space-time volumes that a charged particle passing through the resulting photon density interacts with much more than just one photon, implying that conventional...
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10. Flying focus fields as a tool for strong-field QED and the multipetawatt laser facility NSF OPALAntonino Di Piazza27/08/2024, 14:00
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Kasia Krajewska27/08/2024, 14:30
We present a newly developed method for describing dynamical Sauter-Schwinger process using the S-matrix approach and reduction formulas [1]. The method is based on solving the Dirac equation with Feynmann or anti-Feynmann boundary conditions [2]. It leads to spin-resolved (helicity-resolved) probability amplitudes of produced electrons and positrons. With this approach, after summing up over...
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Dr Christian Kohlfürst (Helmholtz-Zentrum Dresden-Rossendorf)27/08/2024, 15:15
Strong-field quantum electrodynamics is the epitome of what happens when a quantum many-body system is pushed to the extreme. It tests our understanding of non-equilibrium physics, fundamental particle physics and everything we think we know about emergent phenomena and collective dynamics [1]. In particular, identifying the formation time of an electron-positron pair within a background field...
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Selym Villalba Chavez (Heinrich Heine U., Dusseldorf)27/08/2024, 15:40
Production of electron-positron pairs by a high-energy γ photon and a bichromatic laser wave is considered where the latter is composed of a strong low-frequency and a weak high-frequency component, both with circular polarization. An expression for the production rate is derived that accounts for the strong laser mode to all orders and for the weak laser mode to first order. The structure of...
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Stepan Bulanov27/08/2024, 16:25
It is widely accepted that the next lepton collider beyond a Higgs factory would require
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center-of-mass energy of the order of up to 15 TeV. Since, given reasonable space and cost restrictions,
conventional accelerator technology reaches its limits near this energy, high-gradient advanced
acceleration concepts are attractive. Advanced and novel accelerators (ANAs) are leading candidates
due to... -
Naser Ahmadiniaz27/08/2024, 16:50
Neutrino–antineutrino pair production is a key process contributing to energy loss in stars. While previous studies have examined pair creation via the collision of two (γγ→ννˉ) or three (γγγ→ννˉ) real photons, as well as photon collisions in the presence of nuclear Coulomb fields or external magnetic fields, this talk explores a new scenario.
We investigate the pair production of...
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Ruth Jacobs28/08/2024, 08:30
The proposed LUXE experiment (Laser Und XFEL Experiment) at DESY, Hamburg, using the 16.5 GeV electron beam extracted from the European XFEL, aims to study collisions between high-intensity laser pulses and high-energy electron or secondary photon beams. This will elucidate quantum electrodynamics (QED) at the strong-field frontier, where the electromagnetic field of the laser in the probe...
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Eva Los28/08/2024, 09:00
Radiation reaction is the force experienced by an accelerated charge due to radiation emission. Quantum effects dominate charge dynamics, radiation production and radiation reaction for charges accelerated by strong fields. Such fields exist in astrophysical environments such as pulsar magnetospheres, may be accessed by high-power laser systems, and are expected at the interaction point of...
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Thomas Grismayer (Instituto de Plasmas e Fusão Nuclear, Instituto Superior Técnico-Universidade de Lisboa, Lisbon, Portugal)28/08/2024, 09:45
Quantum electrodynamics (QED) cascades describe the exponential growth of an electron-positron-photon plasma in an intense electromagnetic (EM) field. Exponential growth is only possible if both electric and magnetic fields are present. In a nutshell, the electric field allows for every new generation of leptons to be re-accelerated after their creation. In contrast, the magnetic field plays a...
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Anthony Mercuri-Baron (GoLP / IPFN, Instituto Superior Técnico)28/08/2024, 10:10
Plasmas immersed in ultra-intense electromagnetic fields radiate through QED channels high-energy photons which can decay into pairs. These pairs, if created in sufficient amounts, can significantly impact the background field. This is especially true in the context of QED avalanches created by intense lasers, where the exponentially growing density will eventually reach a critical value...
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Dr Suo Tang (Ocean University of China)28/08/2024, 10:35
The quantum electrodynamic (QED) theory predicts the photon emission and pair creation in QED cascades mainly occur in a forward cone with finite angular spread $\Delta\theta \sim 1/\gamma_{i}$ along the momenta of incoming particles. This finite beaming effect has been assumed to be negligible because of the particles' ultra-relativistic Lorentz factor $\gamma_{i}\gg1$ in laser-driven QED...
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Dr Arseny Mironov (LULI, Sorbonne University, CNRS, CEA, Ecole Polytechnique, Paris, France)28/08/2024, 11:20
Since the initial prediction of the onset of selfsustained QED cascades upon injection of particles in certain electromagnetic field configurations [1], the pivotal theory questions remain the same: (i) What are the general conditions required to trigger such cascades? (ii) How many electron-positron pairs can be produced? (iii) What is the threshold of the phenomenon, particularly in the...
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Hidetoshi Taya (Keio University)28/08/2024, 11:45
I discuss high-harmonic generation from the vacuum in strong-field QED. Using the semi-classical approximation, I explicitly calculate the number of photons and the resulting harmonic spectrum in the presence of a spatially uniform linearly-polarized AC electric field, at the leading order in the fine-structure constant $\alpha$. I briefly compare the obtained results with the previous ones,...
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Gerald Dunne28/08/2024, 14:00
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Felix Karbstein28/08/2024, 14:30
In an attempt to obtain any controlled insights into the low-energy effective theory governing the physics of classical electromagnetic fields in the quantum vacuum beyond low loop orders, we study the Heisenberg-Euler effective action in constant electromagnetic fields $\bar{F}$ for quantum electrodynamics (QED) with $N$ charged particle flavors of the same mass and charge $e$ in the large...
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Evgeny Gelfer (ELI Beamlines facility, The Extreme Light Infrastructure ERIC)28/08/2024, 15:15
Coherency can crucially modify the properties of radiation emitted by many particles compared to a single particle. We study the conditions for coherent radiation of an electron bunch driven by a counterpropagating strong pulsed electromagnetic plane wave [1,2]. We derive the spectrum of the coherent radiation and show that it is emitted backwards with respect to the laser propagation...
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Luis Hidalgo (The University of Illinois)28/08/2024, 15:40
Quantum field theory in the presence of strong background fields contains interesting problems where quantum computers may someday provide a valuable computational resource. In the noisy intermediate-scale quantum (NISQ) era it is useful to consider simpler benchmark problems in order to develop feasible approaches, identify critical limitations of current hardware, and build new simulation...
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Tatiana Smorodnikova (Stanford PULSE Institute, SLAC National Accelerator Laboratory, Menlo Park, CA, USA)28/08/2024, 16:05
The SLAC experiment 320 (E-320) collaboration is probing Strong-Field QED (SFQED), by colliding a $\sim 10\, \textrm{GeV}$ electron beam, generated by the FACET-II linear accelerator, with $\sim 10\, \textrm{TW}$ NIR laser pulses [1,2]. The main objectives of E-320 are: a) the investigation of the transition from the multiphoton to the strong background-field regime, where the laser can no...
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Sergei Bulanov (ELI ERIC, ELI-Beamlines, Dolni Brezany, Czech Republic)29/08/2024, 14:00
The progressive development of high-power lasers over the last few decades has made it possible to study the generation of gamma radiation by laser-matter interactions. In the limit of ultra-high fields, this process occurs via nonlinear Compton scattering. Gamma-ray bursts are a phenomenon of wide interest, attracting the attention of researchers working in fields ranging from astrophysics to...
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Prof. Gianlucca Sarri (Queen's College Belfast)29/08/2024, 14:30
At the frontier of ultra-high electromagnetic intensities, it is now possible to access peak laser intensities of up to ∼ $10^{23}$ W/cm$^2$ [1], with even higher intensities envisaged at upcoming multi-petawatt class facilities [2]. The interaction of an ultra-relativistic electron beam with electromagnetic fields of this magnitude represents an ideal experimental configuration to access...
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Ralf Schützhold (Institut für Theoretische Physik, Technische Universität Dresden, Dresden, Germany)29/08/2024, 15:15
We consider birefringent (i.e., polarization changing) scattering of x-ray photons at the superposition of two optical laser beams of ultrahigh intensity and study the resonant contributions of axions or axionlike particles, which could also be short-lived. Applying the specifications of the Helmholtz International Beamline for Extreme Fields (HIBEF), we find that this setup can be more...
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Alexander Macleod (ELI Beamlines Facility, ELI ERIC)29/08/2024, 15:40
Direct measurement of the elastic scattering of real photons on an electromagnetic field would allow the fundamental low-energy constants of quantum electrodynamics (QED) to be experimentally determined. We show that scenarios involving the collision of three laser beams have several advantages over conventional two-beam scenarios. The kinematics of a three-beam collision allows for a higher...
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Dr Christian Schubert (Facultad de Ciencias Físico-Matemáticas, Universidad Michoacana de San Nicolás de Hidalgo, Morelia, Michoacán, Mexico)29/08/2024, 16:25
I summarize recent progress in the application of the worldline formalism to the calculation of one-loop photon amplitudes in strong-field QED with a non-perturbative treatment of the background field. The examples include constant, plane-wave, Redmond, Coulomb and Sauter fields.
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Arseniy Berezin (National Research Nuclear University MEPhI)29/08/2024, 16:50
Strong electromagnetic fields perturb the quantum fluctuations, thereby modifying the properties of the vacuum. This effect is called vacuum polarization. In QED, the thus emergent interaction is described by the second and the omitted higher-order terms in the Heisenberg-Euler action
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$\qquad \qquad \qquad S = ! \int d^4x \left(
\frac{\mathfrak{F}}{4\pi} + \frac{\alpha}{360 \pi^2 E_c^2}... -
Matteo Tamburini (Max Planck Institute for Nuclear Physics)30/08/2024, 09:00
The trajectories of relativistic particles in an intense electromagnetic field can be described by the Landau-Lifshitz equation, where the effect of radiation emission is accounted for via a self-force, and interparticle fields are often neglected as an approximation. Yet, the inclusion of interparticle fields is necessary to ensure energy-momentum conservation, particularly during coherent...
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Dong-Hoon Kim (Seoul National University)30/08/2024, 09:25
Highly magnetized neutron stars have quantum refraction effects on pulsar emission due to the non-
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linearity of the quantum electrodynamics (QED) action. In this context, we investigate the strong-field
QED effects on the following properties in pulsar emission: (i) the propagation and polarization
vectors, (ii) the polarization states. With regard to (i), we determine the leading-order... -
Arkady Gonoskov (University of Gothenburg)30/08/2024, 10:10
Despite some methodological limitations, particle-in-cell simulations can be used to analyze laser-driven QED cascades and dynamics of the emergent QED plasmas. These processes, however, can quickly run into extreme regimes in terms of number of particles and their density causing extraordinary computational demands. We discuss possibilities to overcome some key limitations of the PIC method...
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Prof. Marija Vranic (Instituto de Plasmas e Fusão Nuclear, Instituto Superior Técnico-Universidade de Lisboa, Lisbon, Portugal)30/08/2024, 10:35
Lasers at moderate intensities propagating through a plasma waveguide have demonstrated the potential for generating high-frequency radiation [1] as well as high-charge (>100 nC) electron beams [2] via direct laser acceleration (DLA). Such electron beams in a strong field background can emit multi-MeV photons, which have many potential applications in laboratory astrophysics, photonuclear...
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Mattys Pouyez (Sorbonne Université)30/08/2024, 11:20
In extreme astrophysical environments such as neutron stars, pulsars and magnetars, magnetic fields can reach strengths as high as 1015 Gauss. Due to the fast rotation of the star, a very large electric field is associated with these strong magnetic fields which accelerates charged particles to energies from GeV to TeV and provides an excellent environment for so-called QED shower [1-2]....
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Louis Ingle (University Of York)30/08/2024, 11:40
Objects such as pulsars, magnetars and black holes all have sufficiently strong magnetic fields to reach the Schwinger limit in which strong field quantum electrodynamics (SF-QED) effects become important. Understanding the effects
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of SF-QED on radiation and radiation reaction, the recoil force experienced by a particle as it radiates remains an important investigation in the field of high...
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