Diamond supported photocathodes for electron sources
US6759800B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 29, 1999 |
| Grant date | Jul 6, 2004 |
| Priority date | — |
| Expiry date | Jul 29, 2019 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB82Y10/00
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A photocathode as a source of electron beams, having a substrate of optically transmissive diamond and a photoemitter. A photocathode with a single emitting region provides a single electron beam; a photocathode with multiple emitting regions provides multiple electron beams. The photoemitter is positioned on the side of the diamond substrate opposite the surface on which the illumination is incident, and has an irradiation region at the contact with the optically transmissive diamond, and an emission region opposite the irradiation region, these regions being defined by the path of the illumination. The diamond substrate at the irradiation region/emission region interface conducts heat away from this focused region of illumination on the photocathode. Alternately, a diamond film is used for heat conduction, while another material is used as a substrate to provide structural support. The thermal conductivity of diamond is at least three orders of magnitude greater than that of fused silica, which is an alternative substrate material for photocathodes. This allows for efficient conduction of heat away from the irradiation region/emission region interface, and therefore allows higher…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.