Emittance self-compensation in blow-out mode
Accelerator Physics
2022-12-21 v1
Abstract
We report an unusual regime of emittance self-compensation in an electron bunch generated in blow-out mode by a radio-frequency photocathode gun. Simulations clearly show an initial growth and a subsequent self-compensation of projected emittance in a divergent electron bunch originating from the effects of: (i) strong space-charge forces of mirror charges on the cathode, (ii) an energy chirp in the bunch and (iii) substantial re-shaping of the electron bunch. Furthermore, we show analytically and numerically how a complex interplay between these effects leads to emittance self-compensation in free space -- the effect that is normally observed only in a focusing magnetic field.
Cite
@article{arxiv.2202.07566,
title = {Emittance self-compensation in blow-out mode},
author = {Georgii Shamuilov and Anatoliy Opanasenko and Kévin Pepitone and Zoltán Tibai and Vitaliy Goryashko},
journal= {arXiv preprint arXiv:2202.07566},
year = {2022}
}