US5043630A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electron gun with electron beam modulated by an optical device
Assignee: Thales Electron Devices SA
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Filing: 1990-02-05
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Granted: 1991-08-27
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Expires: 2010-02-05
Abstract
Abstract The device according to the invention comprises a photocathode (1) illuminated by a luminous source (11) modulated at a high frequency F by an optical device (15) controlled at the frequency F, the optical device (15) being interposed between the luminous source and the photocathode. According to one aspect of the invention, the optical modulator (15) is controlled by a surrounding electromagnetic field at a high frequency F, in which the modulator is immersed. The electron gun device according to another aspect of the invention can be associated to a microwave circuit to obtain microwave oscillator or amplifier tubes. According to another aspect of the invention, the device supplies a pulsed electron beam for injection into particle accelerators.
Inventors
- 👤 Georges Faillon
- 👤 Alexis Dubrovin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:23
CPC Classifications
H; H01; H01J; H01J25/00; H01J25/02; H01J25/04
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
72 words
An electron gun intended for emitting a beam modulated at a microwave frequency F, having as an electron source a photocathode, and a photocathode illumination source, wherein said illumination source is an incoherent light source, and an optical modulator is interposed between said illumination source and said photocathode, said optical modulator being controlled at said frequency F to modulate the illumination coming from said source to said cathode at said frequency F.
Claim 2
Dependent Claim
72 words
An electron gun intended for emitting a beam modulated at a microwave frequency F, having as an electron source a photocathode, and a photocathode illumination source, wherein said illumination source is an incoherent light source, and an optical modulator is interposed between said illumination source and said photocathode, said optical modulator being controlled at said frequency F to modulate the illumination coming from said source to said cathode at said frequency F.
Claim 3
Dependent Claim
102 words
An electron gun intended for emitting an electron beam modulated at a microwave frequency F, having as an electron source a photocathode for generating the electron beam, an anode for providing an electrical field between the photocathode and the anode which accelerates electrons of the electron beam in free space, and a photocathode illuminating source, wherein an optical modulator is interposed between said illuminating source and said photocathode, said optical modulator being controlled at a frequency F by a high frequency ambient electromagnetic field surrounding said modulator, to modulate the illumination coming from said source to said cathode at said frequency F.
Claim 4
Dependent Claim
102 words
An electron gun intended for emitting an electron beam modulated at a microwave frequency F, having as an electron source a photocathode for generating the electron beam, an anode for providing an electrical field between the photocathode and the anode which accelerates electrons of the electron beam in free space, and a photocathode illuminating source, wherein an optical modulator is interposed between said illuminating source and said photocathode, said optical modulator being controlled at a frequency F by a high frequency ambient electromagnetic field surrounding said modulator, to modulate the illumination coming from said source to said cathode at said frequency F.
Claim 5
Dependent Claim
24 words
An electron gun as claimed in claim 1, wherein said optical modulator is controlled by a high frequency ambient electromagnetic field surrounding said modulator.
Claim 6
Dependent Claim
16 words
An electron gun as claimed in claim 2, wherein said optical modulator is a Pockels cell.
Claim 7
Dependent Claim
16 words
An electron gun as claimed in claim 2, wherein said optical modulator is a Kerr cell.
Claim 8
Dependent Claim
17 words
An electron gun as claimed in claim 1, wherein said illumination source is a gas discharge lamp.
Claim 9
Dependent Claim
32 words
A microwave amplifier tube comprising a circuit extracting kinetic energy of electrons, transforming said kinetic energy into microwave electromagnetic energy, wherein said tube comprises an electron gun as claimed in claim 1.
Claim 10
Dependent Claim
38 words
A microwave oscillator tube for generating an oscillating electromagnetic field output wherein said tube comprises an electron gun according to claim 1 and said optical modulator is controlled by a signal drawn off from said electromagnetic field output.
Claim 11
Dependent Claim
17 words
An injector for a particle accelerator wherein said injector comprises an electron gun according to claim 1.
Claim 12
Dependent Claim
17 words
An electron gun as claimed in claim 2, wherein said illumination source is a gas discharge lamp.
Claim 13
Dependent Claim
32 words
A microwave amplifier tube comprising a circuit extracting kinetic energy of electrons, transforming said kinetic energy into microwave electromagnetic energy, wherein said tube comprises an electron gun as claimed in claim 2.
Claim 14
Dependent Claim
38 words
A microwave oscillator tube for generating on oscillating electromagnetic field output wherein said tube comprises an electron gun according to claim 2 and said optical modulator is controlled by a signal drawn off from said electromagnetic field output.
Claim 15
Dependent Claim
17 words
An injector for a particle accelerator wherein said injector comprises an electron gun according to claim 2.
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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) | 1994-08-26 | 1995-02-25 | 1995-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-08-26 | 1999-02-25 | 1999-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-08-26 | 2003-02-25 | 2003-08-27 | $7700.00 | Window Closed / Lapsed |