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Dominance of $γ$-$γ$ electron-positron pair creation in a plasma driven by high-intensity lasers | Y. He
; T. G. Blackburn
; T. Toncian
; A. V. Arefiev
; | Date: |
27 Oct 2020 | Abstract: | Creation of electrons and positrons from light alone is a basic prediction of
quantum electrodynamics, but yet to be observed. Here we show that it is
possible to create ${>}10^8$ positrons by dual laser irradiation of a
structured plasma target, at intensities of $2 imes 10^{22}
mathrm{W}mathrm{cm}^{-2}$. In contrast to previous work, the pair creation is
primarily driven by the linear Breit-Wheeler process ($gammagamma o e^+
e^-$), not the nonlinear process assumed to be dominant at high intensity,
because of the high density of $gamma$ rays emitted inside the target. The
favorable scaling with laser intensity of the linear process prompts
reconsideration of its neglect in simulation studies, but also permits positron
jet formation at intensities that are already experimentally feasible.
Simulations show that the positrons, confined by a quasistatic plasma magnetic
field, may be accelerated by the lasers to energies $> 200$ MeV. | Source: | arXiv, 2010.14583 | Services: | Forum | Review | PDF | Favorites |
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