US3914637A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for focusing an electron beam
Assignee: United States Department of the Air Force
•
Filing: 1974-04-29
•
Granted: 1975-10-21
•
Expires: 1994-04-29
Abstract
Abstract A method and apparatus for focusing and projecting a beam from the end of a cathode into an anode of an electron discharge device. A multiplicity of dielectric members are arranged approximately symmetrically around the axis of symmetry. Each of the dielectric members are held at one end in the anode. The initial discharge from the cathode which spreads out radially striking the multiplicity of dielectric members thus supply ions in all directions from the dielectric members, some of which supplies ions near the axis of symmetry for the magnetic selffocusing of the electron beam.
Inventors
- 👤 Willard H Bennett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:12
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/46; H01J29/58
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
151 words
In an electron discharge device a cathode and anode with an electron beam flowing therebetween, apparatus for automatically self-focusing the electron beam, comprising an anode and a cathode in said electron discharge device, said cathode projecting a discharge toward said anode in the form of an electron beam, only said anode and cathode being at high currents and voltages, and a multiplicity of elongated ion producing dielectric rods arranged symmetrically around the axis of symmetry with each of said dielectric rods being selectively doped and each being held at one end in said anode, the initial discharge from said cathode spreading out radially to strike said multiplicity of elongated ion producing dielectric rods resulting in the supplying of ions in all directions from the multiplicity of dielectric rods to supply ions near the axis of symmetry for the magnetic self-focusing of the primary high energy, high current beam from said cathode.
Claim 2
Dependent Claim
151 words
In an electron discharge device a cathode and anode with an electron beam flowing therebetween, apparatus for automatically self-focusing the electron beam, comprising an anode and a cathode in said electron discharge device, said cathode projecting a discharge toward said anode in the form of an electron beam, only said anode and cathode being at high currents and voltages, and a multiplicity of elongated ion producing dielectric rods arranged symmetrically around the axis of symmetry with each of said dielectric rods being selectively doped and each being held at one end in said anode, the initial discharge from said cathode spreading out radially to strike said multiplicity of elongated ion producing dielectric rods resulting in the supplying of ions in all directions from the multiplicity of dielectric rods to supply ions near the axis of symmetry for the magnetic self-focusing of the primary high energy, high current beam from said cathode.
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) | 1978-10-20 | 1979-04-21 | 1979-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-20 | 1983-04-21 | 1983-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-20 | 1987-04-21 | 1987-10-21 | $7700.00 | Window Closed / Lapsed |