Accelerator experiment demonstrates femtosecond high-charge electron bunch generation in an rf gun, highlighting a compact pathway for advanced light sources.
Ultrashort electron bunches are becoming increasingly important for applications such as free-electron lasers, time-resolved electron diffraction/microscopy, and advanced accelerator concepts. We report femtosecond electron bunch generation with a unique rf gun and its precise measurement using a transverse deflecting cavity. A bunch length of 323±13 fs with 120 pC (~7.5×10⁸ electrons) was achieved at a distance of just 3 m from the cathode. A longitudinal phase space distribution was also achieved, and we successfully experimentally confirmed the linearly energy chirped electron bunch generation and self-compression by the velocity difference.
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Koshiba et al. (2021) studied this question.
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