Speaker
Description
The generation of ultrabright electron beams relies on photo-injectors, which are influenced by dynamic surface and collective field effects. Predicting the resulting bunch characteristics is complicated due to the superposition of RF field, near cathode image-charge field, and space-charge. These effects are particularly relevant in high charge density photo-injectors operating with sub-ps bunch duration and nC bunch charge. We present an extended Fowler–Dubridge–canonical photoemission model that incorporates self-consistenly the temporal evolution of the aforementioned surface electric fields. We perform this connection by dynamically coupling the resulting fiends and the Schottky barrier. This method links single-particle photoemission physics with collective field effects, enabling the prediction of quantum yield in real time. Our simulations reveal strong spatio-temporal modulation of the photoemissive process, inducing nonlinear collective forces that degrade beam quality through emittance growth and phase-space distortion. The results underscore the important role in shaping the initial laser pulses to tailor the phase space of electron bunches for future colliders.
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