The R&D of charged particle generation via laser-plasma interaction has been underway at KAERI for nuclear and medical applications. Laser accelerated electrons can be a compact, ultra-short source for the high-energy photons, which is desirable to nuclear reaction or activation experiments. A laser pulse with 30 TW and 30 fs was focused on a helium gas jet target using an off-axis parabola (OAP) mirror with a focal length of 272 mm and tens of MeV electrons were observed with a divergence of 10 mrad, but, with a quite broad energy spread. The simulation for high energy photon generation using laser-accelerated electron beams and the estimation of expected activation of samples was conveyed, using GEANT4 code, to optimize the quality of electrons and/or high energy photons for desired applications. We present the critical issue for high energy photon generation with electron beams accelerated via a laser-plasma interaction.
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