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Electron pulse duration (rms) as a function of propagation distance from the cathode surface for bunches containing 103 and 104 electrons, panels (a) and (b), respectively. Black closed dots: our 300 kV FED design. Blue and red dots: compact 100 kV FED setups with constant electric fields of Ez = 20 MV/m and Ez = 10 MV/m, respectively. Black open dots: compact 300 kV FED setup with constant electric field Ez = 10 MV/m.
