On the screening of the electric field at the cathode surface by an electron space charge at intense field emission

Abstract

The paper considers the effect of the space charge of emitted electrons on the electric field at the tip of a field emitter. To analyze this phenomenon, the Poisson equation was solved numerically for a spherical vacuum diode with a field emission cathode. The dependence of the actual electric field on the geometric electric field has been compared with the known approximate dependencies. Strong screening of the electric field at the cathode by the space charge of emitted electrons at fields over 5×10⁷ V/cm is noted. Based on the obtained dependencies of the actual field on the geometric one and using the SuperSAM code, the field emission occurring in a Muller projector has been simulated. It has been shown that the `ring effect' appearing in field emission patterns can well be explained by the field emission from the peripheral regions of the field emitter. The current density distributions over the surface and in the bulk of the emitter have been analyzed.

Original language	English
Title of host publication	International Symposium on Discharges and Electrical Insulation in Vacuum, ISDEIV
Editors	J. Wetzer
Place of Publication	Piscataway, NJ, United States
Publisher	IEEE
Pages	44-47
Number of pages	4
Volume	1
Publication status	Published - 1998
Externally published	Yes
Event	Proceedings of the 1998 18th Interantional Symposium on Discharges and Electrical Insulation in Vacuum. Part 1 (of 2) - Eindhoven, Neth Duration: 17 Aug 1998 → 21 Aug 1998

Other

Other	Proceedings of the 1998 18th Interantional Symposium on Discharges and Electrical Insulation in Vacuum. Part 1 (of 2)
City	Eindhoven, Neth
Period	17.8.98 → 21.8.98

ASJC Scopus subject areas

Engineering(all)

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On the screening of the electric field at the cathode surface by an electron space charge at intense field emission. / Batrakov, A. V.; Pegel, I. V.; Proskurovsky, D. I.

International Symposium on Discharges and Electrical Insulation in Vacuum, ISDEIV. ed. / J. Wetzer. Vol. 1 Piscataway, NJ, United States : IEEE, 1998. p. 44-47.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Batrakov, AV, Pegel, IV & Proskurovsky, DI 1998, On the screening of the electric field at the cathode surface by an electron space charge at intense field emission. in J Wetzer (ed.), International Symposium on Discharges and Electrical Insulation in Vacuum, ISDEIV. vol. 1, IEEE, Piscataway, NJ, United States, pp. 44-47, Proceedings of the 1998 18th Interantional Symposium on Discharges and Electrical Insulation in Vacuum. Part 1 (of 2), Eindhoven, Neth, 17.8.98.

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abstract = "The paper considers the effect of the space charge of emitted electrons on the electric field at the tip of a field emitter. To analyze this phenomenon, the Poisson equation was solved numerically for a spherical vacuum diode with a field emission cathode. The dependence of the actual electric field on the geometric electric field has been compared with the known approximate dependencies. Strong screening of the electric field at the cathode by the space charge of emitted electrons at fields over 5×107 V/cm is noted. Based on the obtained dependencies of the actual field on the geometric one and using the SuperSAM code, the field emission occurring in a Muller projector has been simulated. It has been shown that the `ring effect' appearing in field emission patterns can well be explained by the field emission from the peripheral regions of the field emitter. The current density distributions over the surface and in the bulk of the emitter have been analyzed.",

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AB - The paper considers the effect of the space charge of emitted electrons on the electric field at the tip of a field emitter. To analyze this phenomenon, the Poisson equation was solved numerically for a spherical vacuum diode with a field emission cathode. The dependence of the actual electric field on the geometric electric field has been compared with the known approximate dependencies. Strong screening of the electric field at the cathode by the space charge of emitted electrons at fields over 5×107 V/cm is noted. Based on the obtained dependencies of the actual field on the geometric one and using the SuperSAM code, the field emission occurring in a Muller projector has been simulated. It has been shown that the `ring effect' appearing in field emission patterns can well be explained by the field emission from the peripheral regions of the field emitter. The current density distributions over the surface and in the bulk of the emitter have been analyzed.

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