Patent US4283687A successfully refreshed from Google Patents.
US4283687A
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US
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Free electron laser with end tapered wiggler strength
Assignee: United States Department of the Air Force
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Filing: 1979-07-27
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Granted: 1981-08-11
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Expires: 1999-07-27
Abstract
Abstract Improved gain and the elimination of beam insertion and extraction compensation in free electron lasers is realized by means of a helical periodic magnet. The magnet comprises one or more layers of coaxial bifilar helical conductors each being 180° displaced and conducting current in opposite directions. The end portions of the magnet are tapered by extending successive layers one or more turns to provide a field gradient that uniformly decreases to zero.
Inventors
- 👤 John M. J. Madey
- 👤 Luis R. Elias
- 👤 Todd I. Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:59
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/09; H01S3/0903
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
72 words
In a free electron laser the improvement residing in a periodic magnet means said magnet means comprising coaxial bifilar helical conductor means, bifilar conductors being 180° displaced and conducting current in opposite directions, said bifilar helical conductor means comprising multiple layers of said bifilar conductors each successive layer thereof extending an increment beyond its antecedent layer to effect a uniform tapered termination configuration, and a current source connected to supply current thereto.
Claim 2
Dependent Claim
72 words
In a free electron laser the improvement residing in a periodic magnet means said magnet means comprising coaxial bifilar helical conductor means, bifilar conductors being 180° displaced and conducting current in opposite directions, said bifilar helical conductor means comprising multiple layers of said bifilar conductors each successive layer thereof extending an increment beyond its antecedent layer to effect a uniform tapered termination configuration, and a current source connected to supply current thereto.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-08-10 | 1985-02-09 | 1985-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-10 | 1989-02-09 | 1989-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-10 | 1993-02-09 | 1993-08-11 | $7700.00 | Window Closed / Lapsed |