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 |
Fingerprint
ASJC Scopus subject areas
- Engineering(all)
Cite this
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
}
TY - GEN
T1 - On the screening of the electric field at the cathode surface by an electron space charge at intense field emission
AU - Batrakov, A. V.
AU - Pegel, I. V.
AU - Proskurovsky, D. I.
PY - 1998
Y1 - 1998
N2 - 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.
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.
UR - http://www.scopus.com/inward/record.url?scp=0032290576&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0032290576&partnerID=8YFLogxK
M3 - Conference contribution
VL - 1
SP - 44
EP - 47
BT - International Symposium on Discharges and Electrical Insulation in Vacuum, ISDEIV
A2 - Wetzer, J.
PB - IEEE
CY - Piscataway, NJ, United States
ER -