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arXiv · 2301.06123

Simulation of short pulse photoemission in a micro-diode with implications for optimal beam brightness

Hákon Örn Árnason·Kristinn Torfason·Andrei Manolescu·Ágúst Valfells
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Abstract

Molecular dynamics simulations, with full Coulomb interaction are used to model short-pulse photoemission from a finite area in a microdiode. We demonstrate three emission regimes, source-limited emission, space-charge limited emission for short-pulses, and space-charge limited emission for the steady state. We show that beam brightness is at a maximum during transition from the source-limited emission regime to the space-charge limited emission regime for short pulses. From our simulations it is apparent that the important factor is the emitter spot size when estimating the critical charge density for short-pulse electron emission.

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Hákon Örn Árnason, Kristinn Torfason, Andrei Manolescu, Ágúst Valfells. 2023-01-15. Simulation of short pulse photoemission in a micro-diode with implications for optimal beam brightness. https://doi.org/10.1109/ted.2024.3351096

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