Patent US4531103A successfully refreshed from Google Patents.
US4531103A
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US
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Multidiameter cavity for reduced mode competition in gyrotron oscillator
Assignee: Communications and Power Industries LLC
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Filing: 1982-12-10
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Granted: 1985-07-23
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Expires: 2002-12-10
Abstract
Abstract In a gyro-monotron oscillator a single, "monotron" cavity is used to interact with the electron beam. To handle very high powers without excessive cavity loss, the cavity is excited in a higher order mode such as TE 0m1 . Other modes can be resonant in the cavity, interfering with the operation when their frequency is near the operating frequency. To increase the mode separation, an upstream section of the cavity is made smaller, to support only a lower-order mode such as TE 011 . Also, the beam is pre-bunched by this lower order, interference-free mode so has less tendency to interact with spurious modes in the higher order cavity.
Inventors
- 👤 Steven J. Evans
- 👤 Robert S. Symons
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:11
CPC Classifications
H; H01; H01J; H01J25/00; H01J25/02; H01J25/025
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
67 words
A gyrotron oscillator comprising a resonant cavity for supporting a standing electromagnetic wave in energy-exchanging relationship with an electron beam, the improvement being that said cavity comprises a plurality of sequential sections along the drift axis of said beam, a first upstream section having a smaller cross-section perpendicular to said axis than a second downstream section the change between cross sections being abrupt in the axial direction.
Claim 2
Dependent Claim
67 words
A gyrotron oscillator comprising a resonant cavity for supporting a standing electromagnetic wave in energy-exchanging relationship with an electron beam, the improvement being that said cavity comprises a plurality of sequential sections along the drift axis of said beam, a first upstream section having a smaller cross-section perpendicular to said axis than a second downstream section the change between cross sections being abrupt in the axial direction.
Claim 3
Dependent Claim
31 words
The oscillator of claim 1 wherein said second section is large enough to support an interaction wave in a higher order mode than the interaction wave supported in said first section.
Claim 4
Dependent Claim
19 words
The oscillator of claim 2 wherein said sections are directly connected, such that said interaction waves are directly coupled.
Claim 5
Dependent Claim
35 words
The oscillator of claim 3 wherein the dimensions of the coupling opening between said sections transverse to said axis are at least as large as the dimensions of said first section transverse to said axis.
Claim 6
Dependent Claim
13 words
The oscillator of claim 2 wherein said interaction waves are TE 0nn waves.
Claim 7
Dependent Claim
18 words
The oscillator of claim 5 wherein said interaction wave in said first section is a TE 01n mode.
Claim 8
Dependent Claim
24 words
The oscillator of claim 1 wherein said cross-section of said first upstream section increases with distance from the end where the beam enters it.
Claim 9
Dependent Claim
24 words
The oscillator of claim 1 wherein said cross-section of said second downstream section increases with distance from the end where the beam enters it.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-07-22 | 1989-01-21 | 1989-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-22 | 1993-01-21 | 1993-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-22 | 1997-01-21 | 1997-07-23 | $7700.00 | Window Closed / Lapsed |