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  Impact of the laser spatio-temporal shape on Breit–Wheeler pair production

Mercuri-Baron, A., Grech, M., Niel, F., Grassi, A., Lobet, M., Di Piazza, A., et al. (2021). Impact of the laser spatio-temporal shape on Breit–Wheeler pair production. New Journal of Physics, 23: 085006. doi:10.1088/1367-2630/ac1975.

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2105.12458.pdf (Preprint), 43MB
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 Creators:
Mercuri-Baron, A.1, Author
Grech, M.2, Author
Niel, F.1, Author
Grassi, A.1, Author
Lobet, M.3, Author
Di Piazza, A.4, Author           
Riconda, C.1, Author
Affiliations:
1LULI, CNRS, CEA, Sorbonne Université, École Polytechnique, Institut Polytechnique de Paris, F-75255 Paris, France, ou_persistent22              
2LULI, CNRS, CEA, Sorbonne Université, École Polytechnique, Institut Polytechnique de Paris, F-91128 Palaiseau, France, ou_persistent22              
3Maison de la Simulation, CEA, CNRS, Université Paris-Sud, UVSQ, Université Paris-Saclay, F-91191 Gif-Sur-Yvette, France, ou_persistent22              
4Division Prof. Dr. Christoph H. Keitel, MPI for Nuclear Physics, Max Planck Society, ou_904546              

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Free keywords: Physics, Plasma Physics, physics.plasm-ph
 MPINP: Research group A. Di Piazza – Division C. H. Keitel
 Abstract: The forthcoming generation of multi-petawatt lasers opens the way to abundant
pair production by the nonlinear Breit-Wheeler process, i.e., the decay of a
photon into an electron-positron pair inside an intense laser field. In this
paper we explore the optimal conditions for Breit-Wheeler pair production in
the head-on collision of a laser pulse with gamma photons. The role of the
laser peak intensity versus the focal spot size and shape is examined keeping a
constant laser energy to match experimental constraints. A simple model for the
soft-shower case, where most pairs originate from the decay of the initial
gamma photons, is derived. This approach provides us with a semi-analytical
model for more complex situations involving either Gaussian or Laguerre-Gauss
(LG) laser beams. We then explore the influence of the order of the LG beams on
pair creation. Finally we obtain the result that, above a given threshold, a
larger spot size (or a higher order in the case of LG laser beams) is more
favorable than a higher peak intensity. Our results match very well with
three-dimensional particle-in-cell simulations and can be used to guide
upcoming experimental campaigns.

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 Dates: 2021-08-18
 Publication Status: Published online
 Pages: 34 pages, 11 figures, submitted to New J. Phys
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: arXiv: 2105.12458
DOI: 10.1088/1367-2630/ac1975
 Degree: -

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Title: New Journal of Physics
  Abbreviation : New J. Phys.
Source Genre: Journal
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Publ. Info: Bristol : IOP Publishing
Pages: - Volume / Issue: 23 Sequence Number: 085006 Start / End Page: - Identifier: ISSN: 1367-2630
CoNE: https://pure.mpg.de/cone/journals/resource/954926913666