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- W2920797244 abstract "We study a method to generate collimated γ-ray/hard X-ray flash with high energy conversion efficiency and high peak brilliance by shooting a double-layer target with a readily available ultra-intense laser pulse. The target is composed of a homogeneous tens-of-micrometer-thick slightly underdense plasma (SUP) slab in front of an ultrathin foil. For optimal targets, particle-in-cell numerical simulations reveal that nonlinear Thomson scattering from directly accelerated superponderomotive electrons leads to the generation of a γ-ray flash with a peak brilliance of 1.6×1022 photons/s/mm2/0.1%BW at the MeV energy level at a laser intensity of 8.5×1020W/cm2. The dependence of the emission on the target parameters is systematically studied. Compared with using slightly overdense plasma, the use of SUP results in the enhancement of the photon number and brightness of the γ-ray flash by a factor of 10 and 40, respectively. The underlying physics of the enhancement is discussed." @default.
- W2920797244 created "2019-03-22" @default.
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- W2920797244 date "2019-03-01" @default.
- W2920797244 modified "2023-10-14" @default.
- W2920797244 title "Generation of bright γ-ray/hard x-ray flash with intense femtosecond pulses and double-layer targets" @default.
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- W2920797244 doi "https://doi.org/10.1063/1.5085306" @default.
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