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The beam optical system of a Polarized Electron Source (PES) is described. The PES is used for nuclear physics experiments with internal gas targets on the MEA-AmPS acceleration facility at NIKHEF. The PES beam optical system consists of a 100keV photoelectron gun, a 100keV beam line, and a 400keV post-accelerator. Both the electrostatic and the beam trajectory calculations in the gun have been performed...
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