US4152625A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plasma generation and confinement with continuous wave lasers
Assignee: United States Department of the Army
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Filing: 1978-05-08
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Granted: 1979-05-01
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Expires: 1998-05-08
Abstract
Abstract A method and apparatus for initiating a stable plasma and maintaining the asma stationary. A high power, continuous wave laser is used to initiate and maintain the plasma, while a magnetic trap confines the plasma.
Inventors
- 👤 Raymond W. Conrad
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:57
CPC Classifications
G; G21; G21B; G21B1/00; G21B1/11; G21B1/23; H; H05; H05H; H05H1/00; H05H1/02; H05H1/10; Y; Y02; Y02E; Y02E30/00; Y02E30/10; Y10; Y10S; Y10S376/00; Y10S376/915
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
105 words
Apparatus for generation and confinement of plasma comprising: a continuous wave laser for radiating energy to a focal plane, ignition means at said focal plane for initiating a plasma when irradiated by said laser energy, magnetic means for restricting normal motion of said plasma up the laser beam, and a housing forming an elongated chamber therein having a longitudinal axis along which said laser energy is directed to said ignition means, and said magnetic means is disposed circumferentially around a portion of said axis for uniformly applying a magnetic field around said axis for containing said plasma between said magnetic field and said focal plane.
Claim 2
Dependent Claim
105 words
Apparatus for generation and confinement of plasma comprising: a continuous wave laser for radiating energy to a focal plane, ignition means at said focal plane for initiating a plasma when irradiated by said laser energy, magnetic means for restricting normal motion of said plasma up the laser beam, and a housing forming an elongated chamber therein having a longitudinal axis along which said laser energy is directed to said ignition means, and said magnetic means is disposed circumferentially around a portion of said axis for uniformly applying a magnetic field around said axis for containing said plasma between said magnetic field and said focal plane.
Claim 3
Dependent Claim
31 words
Apparatus as set forth in claim 1 and further comprising gas within said chamber for maintaining the plasma within the laser beam, and means for varying the pressure within said chamber.
Claim 4
Dependent Claim
15 words
Apparatus as set forth in claim 2 wherein said magnetic means is a superconducting coil.
Claim 5
Dependent Claim
12 words
Apparatus as set forth in claim 3 wherein said gas is air.
Claim 6
Independent Claim
88 words
A method for generating and confinement of a plasma comprising the steps of: focusing a continuous wave laser beam in a focal plane; irradiating igniting means at said focal plane for initiating a plasma; applying a magnetic field across a portion of the path of said laser beam around the circumference thereof for magnetically restricting motion of said plasma up said laser beam; and establishing a selectable plasma equilibrium position within said laser beam between said magnetic field and said focal plane by adjusting the magnetic field intensity.
Claim 7
Independent Claim
88 words
A method for generating and confinement of a plasma comprising the steps of: focusing a continuous wave laser beam in a focal plane; irradiating igniting means at said focal plane for initiating a plasma; applying a magnetic field across a portion of the path of said laser beam around the circumference thereof for magnetically restricting motion of said plasma up said laser beam; and establishing a selectable plasma equilibrium position within said laser beam between said magnetic field and said focal plane by adjusting the magnetic field intensity.
Claim 8
Dependent Claim
31 words
A method as set forth in claim 5 and further comprising the steps of varying the temperature of said plasma by simultaneously varying the laser beam intensity and the magnetic field.
References Cited (Backward Citations)
US3265583A
Cited
US3935504A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-04-30 | 1982-10-30 | 1983-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-30 | 1986-10-30 | 1987-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-30 | 1990-10-30 | 1991-05-01 | $7700.00 | Window Closed / Lapsed |