Crossed-field amplifier with multipactor suppression
US6437510B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 6, 1999 |
| Grant date | Aug 20, 2002 |
| Priority date | — |
| Expiry date | Dec 6, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J25/42
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A crossed-field device such as a crossed-field amplifier or magnetron has a cathode body portion and an anode which cooperates with a crossed magnetic field to maintain emitted electrons on cycloidal paths and amplify an input signal or develop a microwave or millimeter wave output signal in an interaction space. The device is switched to shut down between working cycles, and delayed and secondary emissions are reduced to allow low noise operation and reduce multipactor for dependable operation at lower magnetic field strengths. Ceramic windows cover the output transformer (and input transformer in an amplifier device), and at least one window is grooved to reduce its secondary electron yield while maintaining its rf aperture. In addition, one or more walls within the device are physically structured or chemically treated or arranged to further address multipactor, allowing operation at reduced magnetic field strengths. A thin layer of molybdenum oxide may be coated on the anode, and/or a source of molybdenum may be provided in the cathode to form or sustain such a layer in operation. Alternatively, or in addition, one or more walls of the output and/or input transformer may be gro…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.