A novel technique of symmetric type quasi-linear electron pulse duration\nmodulation is proposed. The salient feature from the conventional photoelectron\ngun is the introduction of the alternating electric field resonator. The\nelectric field that results is synchronously controlled to generate the desired\nquasi-linear differential energy modulation on the electron pulse passing\nthrough. The effect resulted directly is that the leading electrons undergo negative\nenergy modulation and decelerate, while the rear ones positive energy\nmodulation and accelerate, which eventually leads to electron-pulse-duration\nmodulation. The technical details are demonstrated.
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