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compensation magnets. It can include vacuum system and cathode fabrication or transport system. It is usually followed by beam diagnostics and higher-energy accelerators.The key component of a photoinjector is a photocathode, which is located inside the cavity of electron gun (usually, a 0.6-fractional cell for optimal distribution of accelerating field). Extracted electron beam suffers from its own space-charge fields that deteriorate the beam brightness. For that reason,

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