Beam dynamics simulations of optically-enhanced field emission from structured cathodes

Seymour, Andrew; Grote, D.P.; Mihalcea, D.; Piot, P.; Vay, Jean‐Luc

doi:10.1063/1.4965671

Cited by 3 publications

(1 citation statement)

References 11 publications

(7 reference statements)

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“…4(c)] but due to the limited resolution of our pulse-length-measurement technique and the complicated dynamics in the RF gun the functional dependence σ t (E) could not be characterized. In spite of these limitations, the measured pulse duration agrees reasonably well with particle-in-cell simulations performed with the warp framework [18] which includes a self-consistent field-emission model [19]; see Fig. 4(b,d).…”

supporting

confidence: 74%

Measurement of Ampère-class pulsed electron beams via field emission from carbon-nanotube cathodes in a radiofrequency gun

Mihalcea

Faillace

Hartzell

et al. 2015

Applied Physics Letters

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supporting

confidence: 74%

Measurement of Ampère-class pulsed electron beams via field emission from carbon-nanotube cathodes in a radiofrequency gun

Mihalcea

Faillace

Hartzell

et al. 2015

Applied Physics Letters

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Advanced modeling of field enhanced thermionic emission

Edelen

Cook

Hall

et al. 2020

Journal of Vacuum Science &Amp; Technology B, Nanotechnology and Microelectronics: Materials, Processing, Measurement, and Phen

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Shaped emitters are of interest to a broad range of applications in vacuum electronic devices. In particular, thermionic energy converters (TECs) take advantage of shaped emitters to increase the local surface field, thereby extracting more current for a given cathode temperature and applied voltage. However, modeling these devices is challenging; Warp [J.-L. Vay, D. P. Grote, R. H. Cohen, and A. Friedman, Comput. Sci. Discov. 5, 014019 (2012)] is a fully 3D particle-in-cell code capable of handling a wide range of physics problems and is well suited to modeling TECs. Additionally, recent improvements to Warp have enabled the accurate modeling of emitters with arbitrary curved surfaces. Specifically, the inclusion of subgrid resolution for computing the electrostatic potential and the ability to apply mesh refinement for specific areas of interest allow for a more accurate solution to the fields on these surfaces. These improvements coupled with Warp’s ability to handle variable particle weights make it an ideal candidate for simulating these complex devices. In this paper, the authors study the applicability of different subgrid configurations for simulating shaped emission surfaces and field convergence for different mesh-refinement techniques. They then implement a custom weighting algorithm that allows for uniform sampling of emission surfaces with a large variation in the surface electric field. They then use this algorithm to study emission for curved emitters in both the field-enhancement regime and the space-charge regime.

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Simulations of Field-Emission Electron Beams from CNT Cathodes in RF Photoinjectors

Mihalcea¹,

Faillace²,

Panuganti³

et al. 2015

Proceedings of the 6th Int. Particle Accelerator Conf.

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Beam dynamics simulations of optically-enhanced field emission from structured cathodes

Cited by 3 publications

References 11 publications

Measurement of Ampère-class pulsed electron beams via field emission from carbon-nanotube cathodes in a radiofrequency gun

Measurement of Ampère-class pulsed electron beams via field emission from carbon-nanotube cathodes in a radiofrequency gun

Advanced modeling of field enhanced thermionic emission

Simulations of Field-Emission Electron Beams from CNT Cathodes in RF Photoinjectors

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