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)