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23 April 2024 |
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Article overview
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Collimated gamma-ray beams from structured laser-irradiated targets -- how to increase the efficiency without increasing the laser intensity | | O. Jansen
; T. Wang
; Z. Gong
; X. Ribeyre
; E. d'Humières
; D. Stutman
; T. Toncian
; A. Arefiev
; | | Date: |
18 Aug 2019 | | Abstract: | Using three-dimensional kinetic simulations, we examine the emission of
collimated gamma-ray beams from structured laser-irradiated targets with a
pre-filled cylindrical channel. The channel guides the incident laser pulse,
enabling generation of a slowly evolving azimuthal plasma magnetic field that
serves two key functions: to enhance laser-driven electron acceleration and to
induce emission of gamma-rays by the energetic electrons. Our main finding is
that the conversion efficiency of the laser energy into a beam of gamma-rays
($5^{circ}$ opening angle) can be significantly increased without increasing
the laser intensity by utilizing channels with an optimal density. The
conversion efficiency into multi-MeV photons increases roughly linearly with
the incident laser power $P$, as we increase $P$ from 1 PW to 4 PW while
keeping the laser peak intensity fixed at $5 imes 10^{22}$ W/cm$^2$. This
scaling is achieved by using an optimal range of plasma densities in the
channel between 10 and $20 n_{cr}$, where $n_{cr}$ is the classical cutoff
density for electromagnetic waves. The corresponding number of photons scales
as $P^2$. One application that directly benefits from such a strong scaling is
the pair production via two-photon collisions, with the number of generated
pairs increasing as $P^4$ at fixed laser intensity. | | Source: | arXiv, 1908.6467 | | Services: | Forum | Review | PDF | Favorites | |
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