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  • Letter
  • Open Access

Coherent radiation of an electron bunch colliding with an intense laser pulse

E. G. Gelfer1,*, A. M. Fedotov2,†, O. Klimo1,3, and S. Weber1

  • *egelfer@gmail.com
  • †am_fedotov@mail.ru

Phys. Rev. Research 6, L032013 – Published 15 July, 2024

DOI: https://doi.org/10.1103/PhysRevResearch.6.L032013

Abstract

We study the conditions for coherent radiation of an electron bunch driven by a counterpropagating strong pulsed electromagnetic plane wave. We derive the spectrum of the coherent radiation and show that it is emitted backward 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 three-dimensional 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.

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