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Generation of a modulated IREB with a frequency tunable by a magnetic field
Assignee: UNITED STATES OF AMERICAN AS RESPRESENTED BY SECRETARY OF NAVY
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Filing: 1985-07-08
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Granted: 1985-12-03
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Expires: 2005-07-08
Abstract
Abstract The present invention comprises a device for generating a modulated intense relativistic electron beam (IREB) with an electronically tunable frequency, comprising: a longitudinally running drift tube; a plurality of gaps in the drift tube including a first gap and a second gap, disposed with a predetermined distance 1 therebetween; and a plurality of cavities, with a first cavity disposed around the drift tube at the location of the first gap, and a second cavity disposed around the drift tube at the location of the second gap. These first and second cavities are provided with volumes and a geometry such as to excite a predetermined frequency band below the plasma frequency for the device. A circuit is provided for generating an IREB and injecting this IREB to propagate within the drift tube with a predetermined plasma frequency. Additionally, a main magnetic field generating means is provided for generating a magnetic field for confining the IREB to a desired beam diameter. The frequency tuning is obtained by providing an auxiliary magnetic field running parallel to and within the drift tube and located only along a predetermined length between the first and second gaps, with this auxiliary magnetic field being tunable to thereby tune the frequencies of excitations in the first and second gaps. Finally, a means is provided at one end of the drift tube for converting the kinetic energy of the IREB into electrical energy.
Inventors
- 👤 Moshe Friedman
- 👤 Victor Serlin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:24
CPC Classifications
H; H01; H01J; H01J25/00; H01J25/02
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
271 words
A device for generating a modulated intense relativistic electron beam (IREB) with an electronically tunable frequency, comprising: a longitudinally running drift tube with a first and second ends; a plurality of gaps in said drift tube including a first gap in said drift tube, and a second gap in said drift tube disposed a predetermined distance x from said first gap; a plurality of cavities, with a cavity disposed around said drift tube at the location of each of said plurality of gaps, said plurality of cavities including a first cavity disposed around said drift tube at the location of said first gap, and a second cavity disposed around said drift tube at the location of said second gap, said first and second cavities having volumes and geometry such as to excite a predetermined frequency band below a plasma frequency; means for generating an intense relativistic electron beam (IREB) and injecting said IREB to propagate within said drift tube from said first end, and having said predetermined plasma frequency; main magnetic field generating means for generating a magnetic field running parallel to and within said drift tube for confining said IREB to a desired beam diameter; auxiliary magnetic field generating means for generating an auxiliary magnetic field running parallel to and within said drift tube and located only along a predetermined length between said first and second gaps, said auxiliary magnetic field generating means being tunable to thereby tune the frequency of excitation in said first and second cavities; and means disposed at the second end of said drift tube for converting the kinetic energy of said IREB into electrical energy.
Claim 2
Independent Claim
271 words
A device for generating a modulated intense relativistic electron beam (IREB) with an electronically tunable frequency, comprising: a longitudinally running drift tube with a first and second ends; a plurality of gaps in said drift tube including a first gap in said drift tube, and a second gap in said drift tube disposed a predetermined distance x from said first gap; a plurality of cavities, with a cavity disposed around said drift tube at the location of each of said plurality of gaps, said plurality of cavities including a first cavity disposed around said drift tube at the location of said first gap, and a second cavity disposed around said drift tube at the location of said second gap, said first and second cavities having volumes and geometry such as to excite a predetermined frequency band below a plasma frequency; means for generating an intense relativistic electron beam (IREB) and injecting said IREB to propagate within said drift tube from said first end, and having said predetermined plasma frequency; main magnetic field generating means for generating a magnetic field running parallel to and within said drift tube for confining said IREB to a desired beam diameter; auxiliary magnetic field generating means for generating an auxiliary magnetic field running parallel to and within said drift tube and located only along a predetermined length between said first and second gaps, said auxiliary magnetic field generating means being tunable to thereby tune the frequency of excitation in said first and second cavities; and means disposed at the second end of said drift tube for converting the kinetic energy of said IREB into electrical energy.
Claim 3
Dependent Claim
16 words
A device as defined in claim 1, wherein said IREB generating means comprises a foilless diode.
Claim 4
Dependent Claim
28 words
A device as defined in claim 2, wherein said first and second cavities are formed coaxially around said drift tube at the first and second gap locations, respectively.
Claim 5
Dependent Claim
33 words
A device as defined in claim 3, wherein said auxiliary magnetic field generating means comprises means for generating said auxiliary magnetic field within said drift from said first gap to said second gap.
Claim 6
Dependent Claim
46 words
A device as defined in claim 1, wherein said distance x between said first and second gaps is set in order to place the first and second cavity excitation at a discontinuity in the frequency v. x response curve when there is no auxiliary magnetic field.
Claim 7
Independent Claim
169 words
A method for tuning a modulated intense relativistic electron beam, comprising steps of: generating an intense relativistic electron beam (IREB) and injecting said IREB into a drift tube to propagate along a path in said drift tube, said IREB facilitating a predetermined plasma frequency; causing said IREB to reflex in said drift tube between at least two points along the length of said drift tube; modulating said IREB to obtain longitudinally spaced bunches of electrons in said drift tube at a frequency within a predetermined frequency band which is below said plasma frequency; generating a main magnetic field running parallel to and within said drift tube for confining said IREB to a desired beam diameter; generating an auxiliary magnetic field running parallel to and within said drift tube and located only along a predetermined length between said first and second points; tuning said auxiliary magnetic field to thereby tune the frequency of modulation within said predetermined frequency band; and converting the kinetic energy of said IREB into electrical energy.
Claim 8
Independent Claim
169 words
A method for tuning a modulated intense relativistic electron beam, comprising steps of: generating an intense relativistic electron beam (IREB) and injecting said IREB into a drift tube to propagate along a path in said drift tube, said IREB facilitating a predetermined plasma frequency; causing said IREB to reflex in said drift tube between at least two points along the length of said drift tube; modulating said IREB to obtain longitudinally spaced bunches of electrons in said drift tube at a frequency within a predetermined frequency band which is below said plasma frequency; generating a main magnetic field running parallel to and within said drift tube for confining said IREB to a desired beam diameter; generating an auxiliary magnetic field running parallel to and within said drift tube and located only along a predetermined length between said first and second points; tuning said auxiliary magnetic field to thereby tune the frequency of modulation within said predetermined frequency band; and converting the kinetic energy of said IREB into electrical energy.
Claim 9
Dependent Claim
58 words
A method as defined in claim 6, wherein said reflex causing step includes the step of choosing the distance x between said at least two points along the length of said drift tube in order to place the IREB frequency modulation at a discontinuity in the frequency v. x response curve where there is no auxiliary magnetic field.
Claim 10
Independent Claim
132 words
A device for electronically tuning the modulation frequency of an intense relativistic electron beam (IREB), comprising: a longitudinally running drift tube; means for generating a reflexing IREB which reflexes within said drift tube between at least two points along the length of said drift tube, said IREB having a predetermined plasma frequency; means for modulating said IREB to obtain longitudinally spaced bunches of electrons in said drift tube, with the bunches modulated to have a frequency in a band of frequencies below said plasma frequency; means for generating an auxiliary magnetic field running parallel to and within said drift tube and located along only a predetermined length of said drift tube between said two points, said auxiliary magnetic field being tunable to thereby tune said modulated frequency within said band of frequencies.
Claim 11
Independent Claim
132 words
A device for electronically tuning the modulation frequency of an intense relativistic electron beam (IREB), comprising: a longitudinally running drift tube; means for generating a reflexing IREB which reflexes within said drift tube between at least two points along the length of said drift tube, said IREB having a predetermined plasma frequency; means for modulating said IREB to obtain longitudinally spaced bunches of electrons in said drift tube, with the bunches modulated to have a frequency in a band of frequencies below said plasma frequency; means for generating an auxiliary magnetic field running parallel to and within said drift tube and located along only a predetermined length of said drift tube between said two points, said auxiliary magnetic field being tunable to thereby tune said modulated frequency within said band of frequencies.
Claim 12
Dependent Claim
101 words
A device as defined in claim 8, wherein said reflexing generating means comprises a first gap in said drift tube at one of said two points, and a second gap in said drift tube at the other of said two points; and wherein said modulating means comprises a first cavity disposed around said drift tube at the location of said first gap, and a second cavity disposed around said drift tube at the location of said second gap; and further including means disposed at one end of said drift tube for converting the kinetic energy of said IREB into electrical energy.
Claim 13
Dependent Claim
52 words
A device as defined in claim 9, wherein there is a distance x between said first and second gaps which is set in order to place the frequency modulation on said IREB when no auxiliary magnetic field is present at a discontinuity in the frequency v. x response curve for the device.
Claim 14
Dependent Claim
52 words
A device as defined in claim 10, wherein said reflexing generating means includes: means for generating an IREB and injecting said IREB to propagate within said drift tube; and means for generating a main magnetic field parallel to and within said drift tube for confining said IREB to a desired beam diameter.
Claim 15
Dependent Claim
34 words
A device as defined in claim 11, wherein said auxiliary magnetic field generating means comprises means for generating said auxiliary magnetic field within said drift tube from said first gap to said second gap.
References Cited (Backward Citations)
US3398376A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-12-02 | 1989-06-03 | 1989-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-02 | 1993-06-03 | 1993-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-02 | 1997-06-03 | 1997-12-03 | $7700.00 | Window Closed / Lapsed |