US4398121A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mode suppression means for gyrotron cavities
Assignee: Communications and Power Industries LLC
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Filing: 1981-02-05
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Granted: 1983-08-09
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Expires: 2001-02-05
Abstract
Abstract In a gyrotron electron tube of the gyro-klystron or gyro-monotron type, having a cavity supporting an electromagnetic mode with circular electric field, spurious resonances can occur in modes having noncircular electric field. These spurious resonances are damped and their frequencies shifted by a circular groove in the cavity parallel to the electric field.
Inventors
- 👤 Marvin Chodorow
- 👤 Robert S. Symons
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:35
CPC Classifications
H; H01; H01J; H01J25/00; H01J25/02; H01J25/025
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
122 words
In a gyrotron: means for forming a beam of spiraling charged particles, a hollow conducting cavity shaped to resonate in a mode with circular electric field, an end of said cavity comprising an opening for passage of said beam, an end of said cavity comprising an opening connecting to a circular waveguide capable of transmitting a wave having a circular electric field, the improvement being a groove in the wall of said cavity, said groove running parallel to said electric field of said mode, the walls of said groove having low resistive loss and the interior of said groove having low dielectric loss, whereby field patterns of modes with non-circular electric fields are perturbed with only a small dissipation of their energy.
Claim 2
Dependent Claim
122 words
In a gyrotron: means for forming a beam of spiraling charged particles, a hollow conducting cavity shaped to resonate in a mode with circular electric field, an end of said cavity comprising an opening for passage of said beam, an end of said cavity comprising an opening connecting to a circular waveguide capable of transmitting a wave having a circular electric field, the improvement being a groove in the wall of said cavity, said groove running parallel to said electric field of said mode, the walls of said groove having low resistive loss and the interior of said groove having low dielectric loss, whereby field patterns of modes with non-circular electric fields are perturbed with only a small dissipation of their energy.
Claim 3
Dependent Claim
22 words
The gyrotron of claim 1 wherein said cavity, said waveguide, said groove and said openings are figures of revolution about an axis.
Claim 4
Dependent Claim
19 words
The gyrotron of claim 2 wherein the outline of said beam is a figure of revolution about said axis.
Claim 5
Dependent Claim
36 words
The gyrotron of claim 1 wherein said wall of said cavity is of high-conductivity metal and the walls, including the bottom, of said groove are of high-conductivity metal and the interior of said groove is empty.
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) | 1986-08-08 | 1987-02-07 | 1987-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-08 | 1991-02-07 | 1991-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-08 | 1995-02-07 | 1995-08-09 | $7700.00 | Window Closed / Lapsed |