Coulomb interactions in high-coherence femtosecond electron pulses from tip emitters.
Journal
Structural dynamics (Melville, N.Y.)
ISSN: 2329-7778
Titre abrégé: Struct Dyn
Pays: United States
ID NLM: 101660872
Informations de publication
Date de publication:
Jan 2019
Jan 2019
Historique:
received:
12
10
2018
accepted:
08
01
2019
entrez:
15
3
2019
pubmed:
15
3
2019
medline:
15
3
2019
Statut:
epublish
Résumé
Tip-based photoemission electron sources offer unique properties for ultrafast imaging, diffraction, and spectroscopy experiments with highly coherent few-electron pulses. Extending this approach to increased bunch-charges requires a comprehensive experimental study on Coulomb interactions in nanoscale electron pulses and their impact on beam quality. For a laser-driven Schottky field emitter, we assess the transverse and longitudinal electron pulse properties in an ultrafast transmission electron microscope at a high photoemission current density. A quantitative characterization of electron beam emittance, pulse duration, spectral bandwidth, and chirp is performed. Due to the cathode geometry, Coulomb interactions in the pulse predominantly occur in the direct vicinity to the tip apex, resulting in a well-defined pulse chirp and limited emittance growth. Strategies for optimizing electron source parameters are identified, enabling advanced ultrafast transmission electron microscopy approaches, such as phase-resolved imaging and holography.
Identifiants
pubmed: 30868085
doi: 10.1063/1.5066093
pii: 1.5066093
pii: 003901SDY
pmc: PMC6404915
doi:
Types de publication
Journal Article
Langues
eng
Pagination
014301Références
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