Generation of intense negative ion beams
US4649278A · kind A · utility
21Cited by
8References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 2, 1985 |
| Grant date | Mar 10, 1987 |
| Priority date | — |
| Expiry date | May 2, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J27/028
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electron gun is used with a mirror electrostatic field to produce zero or near zero velocity electrons by forming a turning point in their trajectories. A gas capable of attaching zero or near zero velocity is introduced at this turning point, and negative ions are produced by the attachment or dissociative attachment process. Operation may be continuous or pulsed. Ions thus formed are extracted by a simple lens system and suitable biasing of grids.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.