Electron reversal ionizer for detection of trace species using a spherical cathode
US5374828A · kind A · utility
8Cited by
7References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 15, 1993 |
| Grant date | Dec 20, 1994 |
| Priority date | — |
| Expiry date | Sep 15, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J2237/2533
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A reversal electron, high-current ionizer capable of focusing a beam of electrons to a reversal region employs an indirectly heated cathode having a concave emitting surface of width W<2r, where r is the radius of curvature and preferably a ratio of width to radius approximately equal to one for optimum high current for a given cathode width.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.