Speaker
Description
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 direction and has a very narrow angular spread. We demonstrate that for a solid density plasma coherent radiation extends to frequencies up to hundreds of keV thereby enhancing the low-frequency part of the spectrum by many orders of magnitude. Our analytical findings are tested with 3D particle-in-cell simulations of an electron bunch passing through a laser pulse, clearly demonstrating how the coherence can essentially modify the observed radiation spectrum.
References
[1] E.G. Gelfer, A.M. Fedotov, O. Klimo, S. Weber, arXiv:2306.16945 (2023).
[2] E.G. Gelfer, A.M. Fedotov, O. Klimo, S. Weber, MRE 9, 024201 (2024).
[3] J. Derouillat,et. al., Comput. Phys. Commun. 222, 351 (2018).
