У оквиру семинара Центра за изучавање комплексних система Института за физику у Београду, у понедељак, 15. септембра 2025. године у 14 часова у сали „Звонко Марић“ Института за физику у Београду, др Томас Грисмајер (Група за ласере и плазму, Институт за плазму и нуклеарну фузију, Виши технички институт, Универзитет у Лисабону) одржаће предавање:
Towards Laboratory Electron-Positron Plasma via Electromagnetic Showers
САЖЕТАК:
When a relativistic electron interacts with a strong field, the combination of photon emission and pair creation leads to an Electromagnetic Shower (EMS). New Petawatt laser facilities offer an opportunity to accelerate multi-GeV electrons using plasma technology, to generate strong laser electromagnetic fields, and are therefore ideal for probing EMS and pursuing the long-standing objective of generating a pair plasma in the laboratory [1]. Despite efforts in understanding the shower properties, a complete theory of showers in all regimes is yet to be found.
We use a generation-splitting method and derive expressions for the shower multiplicity and particle spectra at short and long times. We apply our approach to showers in the Coulomb field of neutral targets and strong external fields. The analytical results are compared with PIC codes, Geant4, and a Monte Carlo code. Our results are predictive for realistic future experiments: the collisions of electrons with a high-intensity laser [2]. Additionally, we consider the interaction of an electron beam with matter to provide a simple criterion for pair plasma production as a function of the incident beam properties [3].
Acknowledgments: FCT (Portugal) Grant No. CEECIND/04050/2021 and ANR (g4QED project, Grant No.. ANR-23-CE30-0011)
[1] G. Sarri et al., Nature Communications 10.1038/NCOMMS7747 (2015); C. D. Arrowsmith et al., Nature Communications 15, 10.1038/s41467-024-49346-2 (2024), H. Chen and F. Fiuza, Physics of Plasmas 30, 020601 (2023).
[2] M. Pouyez et al., Physical Review Letters 134.13, 135001 (2025)
[3] M. Pouyez et al., arXiv:2505.18843 (2025)