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- W4328122554 abstract "Abstract Laser-accelerated electrons are promising in producing gamma-photon beams of high peak flux for the study of nuclear photonics, obtaining copious positrons and exploring photon–photon interaction in vacuum. We report on the experimental generation of brilliant gamma-ray beams with not only high photon yield but also low divergence, based on picosecond laser-accelerated electrons. The 120 J 1 ps laser pulse drives self-modulated wakefield acceleration in a high-density gas jet and generates tens-of-MeV electrons with 26 nC and divergence as small as $1.51{}^{circ}$ . These collimated electrons produce gamma-ray photons through bremsstrahlung radiation when transversing a high- Z solid target. We design a high-energy-resolution Compton-scattering spectrometer and find that a total photon number of $2.2times {10}^9$ is captured within an acceptance angle of $1.1{}^{circ}$ for photon energies up to $16;mathrm{MeV}$ . Comparison between the experimental results and Monte Carlo simulations illustrates that the photon beam inherits the small divergence from electrons, corresponding to a total photon number of $2.2times {10}^{11}$ and a divergence of $7.73{}^{circ}$ ." @default.
- W4328122554 created "2023-03-22" @default.
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- W4328122554 date "2023-01-01" @default.
- W4328122554 modified "2023-09-26" @default.
- W4328122554 title "Collimated gamma-beams with high peak flux driven by laser-accelerated electrons" @default.
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- W4328122554 doi "https://doi.org/10.1017/hpl.2023.25" @default.
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