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Description
Slice energy spread is a key beam-quality parameter that limits the compression of ultrashort electron bunches. To suppress the RF-dominated slice-energy-spread growth in a photocathode RF gun, a 2.3--2.3 cell configuration with a cascaded cavity with a decelerating field is proposed on the basis of the quasi-DC 2.3-cell X-band gun. Simulations show that, without space-charge effects, the slice energy spread can be reduced from 121~eV to 37~eV, and further to 5~eV after field-ratio optimization. The proposed scheme also exhibits good tolerance to variations in the initial beam parameters, although its compensation capability at high bunch charge is limited by nonlinear space-charge effects. These results demonstrate that the cavity with a decelerating field provides an effective approach for the development of low-slice-energy-spread RF guns for ultrashort bunch generation.
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