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

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.

9 pages 10 figures

References in corpus (5)

• Molecular Dynamics Simulations of Field Emission From a Planar Nanodiode
• Molecular Dynamics Simulations of Field Emission From a Prolate Spheroidal Tip
• Space-Charge Limited Current from a Finite Emitter in Nano- and Microdiodes
• Molecular Dynamics Simulations of Mutual Space-Charge Effect between Planar Field Emitters
• Dynamics of a Field Emitted Beam from a Microscopic Inhomogeneous Cathode