Charged particle filter
US9697984B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 28, 2015 |
| Grant date | Jul 4, 2017 |
| Priority date | — |
| Expiry date | Oct 28, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J2237/2442
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A charged particle filter includes a magnetic deflector having a bore along an axis thereof passing through the magnetic deflector from a sample end to a detector end of the magnetic deflector, and through which bore charged particles pass when in use, the magnetic deflector being formed from two magnets positioned around the bore, with a gap between the two magnets, the two magnets each having a linear central section and two ends, each end forming a curved surface, the curved surface having an aspect ratio defined by a height in a range of between one tenth and ten times the gap between the two magnets, and a width in a range of between one tenth and ten times the gap.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.