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  • Letter
  • Open Access

Radiation reaction enhancement in flying focus pulses

M. Formanek1,*, D. Ramsey2, J. P. Palastro2, and A. Di Piazza1,†

  • 1Max Planck Institute for Nuclear Physics, Saupfercheckweg 1, D-69117 Heidelberg, Germany
  • 2University of Rochester, Laboratory for Laser Energetics, Rochester, New York 14623, USA

  • *formanek@mpi-hd.mpg.de
  • †dipiazza@mpi-hd.mpg.de

Phys. Rev. A 105, L020203 – Published 25 February, 2022

DOI: https://doi.org/10.1103/PhysRevA.105.L020203

Abstract

Radiation reaction (RR) is the oldest still-unsolved problem in electrodynamics. In addition to conceptual difficulties in its theoretical formulation, the requirement of exceedingly large charge accelerations has thus far prevented its unambiguous experimental identification. Here, we show how measurable RR effects in a laser-electron interaction can be achieved through the use of flying focus pulses (FFPs). By allowing the focus to counterpropagate with respect to the pulse phase velocity, a FFP overcomes the intrinsic limitation of a conventional laser Gaussian pulse (GP) that limits its focus to a Rayleigh range. For an electron initially also counterpropagating with respect to the pulse phase velocity, an extended interaction length with the laser peak intensity is achieved in a FFP. As a result, the same RR deceleration factors are obtained, but at FFP laser powers orders of magnitude lower than for ultrashort GPs with the same energy. This renders the proposed setup much more stable than those using GPs and allows for more accurate in situ diagnostics. Using the Landau-Lifshitz equation of motion, we show numerically and analytically that the capability of emerging laser systems to deliver focused FFPs will allow for a clear experimental identification of RR.

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