Physics in Intense Fields (PIF24)

Session

General Talk 2

28 Aug 2024, 09:00

Zoom

Conveners

General Talk 2

• Chair: Laura Corner

General Talk 2

• Chair: Matteo Tamburini

General Talk 2

• Chair: Patrick Copinger

19. Observation of quantum effects on radiation reaction in strong fields

Eva Los

28/08/2024, 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...

22. Growth rate and steady-sate distribution function of a QED cascade

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...

23. Dynamical Screening of ultra-intense Fields in QED plasmas

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...

26. Finite beaming effect on QED cascades

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 $\mathrm{\Delta }\theta \sim 1/{\gamma }_i$ along the momenta of incoming particles. This finite beaming effect has been assumed to be negligible because of the particles' ultra-relativistic Lorentz factor ${\gamma }_i\gg 1$ in laser-driven QED...

24. On the theory of avalanche-type QED cascades in strong electromagnetic fields

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...

16. Vacuum HHG in strong-field QED

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,...