3-dimensional differential pumping system and method thereof
US7755039B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 26, 2007 |
| Grant date | Jul 13, 2010 |
| Priority date | — |
| Expiry date | Apr 7, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J49/38
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A differential pumping system in which a vacuum chamber is manufactured to have a plurality of vacuum pumps and conductance limit plates between the vacuum pumps. The differential pumping system in which an ion is implanted from an ionization source, passes through the vacuum chamber and is detected by a detection unit includes a plurality of vacuum pumps in the vacuum chamber and one or more conductance limit plates between the vacuum pumps, and the conductance limit plates form an angle less than 90° with the transmission direction of the ion. According to such a constitution, higher degree of vacuum and the ion transmission efficiency are maintained without increasing the length of the vacuum chamber. Furthermore, it is possible to minimize the attenuation of an ion detection signal due to a collision with a neighboring neutral molecule, improving the sensitivity of an ion detection device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.