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Simulation-Based Model of Randomly Distributed Large-Area Field Electron Emitters

Bieker, Johannes ; Forbes, Richard G. ; Wilfert, Stefan ; Schlaak, Helmut F. (2019)
Simulation-Based Model of Randomly Distributed Large-Area Field Electron Emitters.
In: IEEE Journal of the Electron Devices Society, 2019, 7
Article, Secondary publication, Publisher's Version

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Item Type: Article
Type of entry: Secondary publication
Title: Simulation-Based Model of Randomly Distributed Large-Area Field Electron Emitters
Language: German
Date: 2019
Place of Publication: Darmstadt
Year of primary publication: 2019
Publisher: IEEE
Journal or Publication Title: IEEE Journal of the Electron Devices Society
Volume of the journal: 7
Corresponding Links:
Origin: Secondary publication via sponsored Golden Open Access
Abstract:

With a large-area field electron emitter (LAFE), it is desirable to choose the spacings of individual emitters in such a way that the LAFE-average emission current density and total current are maximised, when the effects of electrostatic depolarization (mutual screening) are taken into account. This paper uses simulations based on a finite element method to investigate how to do this for a LAFE with randomly distributed emitters. The approach is based on finding the apex field enhancement factor and the specific emission current for an emitter, as a function of the average nearest neighbor spacing between emitters. Using electrostatic simulations based on the finite element method, the influence of neighboring emitters on a reference emitter being placed at the LAFE centre is investigated. Arrays with 25 ideal (identical) conical emitters with rounded tops are studied for different emitter densities and applied macroscopic fields. A theoretical average spacing is derived from the Poisson Point Process Theory. An optimum average spacing, and hence optimum emitter density, can be predicted for each macroscopic field.

Status: Publisher's Version
URN: urn:nbn:de:tuda-tuprints-92048
Date Deposited: 25 Oct 2019 14:25
Last Modified: 13 Dec 2022 11:13
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/9204
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