US4871918A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hollow-anode ion-electron source
Assignee: INSTITUTE FOR ATOMIC PHYSICS
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Filing: 1987-10-06
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Granted: 1989-10-03
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Expires: 2007-10-06
Abstract
Abstract An ion-electron source based on a new type of gas discharge in a hollow anode is presented. A small surface of the exit aperture and a high density of the current enable high brightness of the source; high efficiency and simple construction make possible low production price and long lifetime of the source.
Inventors
- 👤 Vujo I. Miljevic
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:27
CPC Classifications
H; H01; H01J; H01J3/00; H01J3/02; H01J3/025; H01J27/00; H01J27/02
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
76 words
A hollow anode ion-electron source comprising: a housing or discharge tube, having a gas inlet opening; a hollow anode within the housing, said anode comprising an aperture having an inner surface wherein only said inner surface is conductive, said aperture functioning as an exit aperture of the source; a cathode within the housing spaced from the hollow anode aperture; an extraction electrode; and connecting means for connecting the anode, cathode, and extraction electrode to power supplies.
Claim 2
Dependent Claim
76 words
A hollow anode ion-electron source comprising: a housing or discharge tube, having a gas inlet opening; a hollow anode within the housing, said anode comprising an aperture having an inner surface wherein only said inner surface is conductive, said aperture functioning as an exit aperture of the source; a cathode within the housing spaced from the hollow anode aperture; an extraction electrode; and connecting means for connecting the anode, cathode, and extraction electrode to power supplies.
Claim 3
Dependent Claim
26 words
The source of claim 1 wherein the cathode is concave about a center of curvature and the hollow anode aperture is in the center of curvature.
Claim 4
Dependent Claim
26 words
The source of claim 1 wherein the cathode is hemispherical with a center of curvature and the hollow anode aperture is in the center of curvature.
Claim 5
Dependent Claim
23 words
The source of claim 1 wherein a magnetic field with a component normal to the plane of the hollow anode aperture is supplied.
Claim 6
Dependent Claim
14 words
The source of claim 4 wherein the extraction electrode is of non magnetic material.
Claim 7
Dependent Claim
13 words
The source of claim 4 wherein the extraction electrode is of magnetic material.
Claim 8
Dependent Claim
38 words
The source of claim 4 wherein the hollow anode aperture is rectangular and consists of two parts of magnetic material, with conductive opposite surfaces, so that the magnetic field may be obtained only in the hollow anode aperture.
Claim 9
Dependent Claim
14 words
The source of claim 7 wherein the hollow anode parts are at different potentials.
Claim 10
Dependent Claim
15 words
The source of claim 7 wherein the hollow anode parts are at the same potential.
Claim 11
Dependent Claim
25 words
The source of claim 4 wherein the hollow anode aperture is rectangular and consists of two parts of non magnetic material with conductive opposite surfaces.
Claim 12
Dependent Claim
14 words
The source of claim 10 wherein the hollow anode parts are at different potentials.
Claim 13
Dependent Claim
15 words
The source of claim 10 wherein the hollow anode parts are at the same potential.
Claim 14
Dependent Claim
15 words
The source of claim 7, wherein the extraction electrode is of a non magnetic material.
Claim 15
Dependent Claim
15 words
The source of claim 8, wherein the extraction electrode is of a non magnetic material.
Claim 16
Dependent Claim
14 words
The source of claim 9, wherein the extraction electrode is of a non-magnetic material.
Claim 17
Dependent Claim
15 words
The source of claim 10, wherein the extraction electrode is of a non magnetic material.
Claim 18
Dependent Claim
15 words
The source of claim 11, wherein the extraction electrode is of a non magnetic material.
Claim 19
Dependent Claim
14 words
The source of claim 12, wherein the extraction electrode is of a non-magnetic material.
Claim 20
Dependent Claim
14 words
The source of claim 7, wherein the extraction electrode is of a magnetic material.
Claim 21
Dependent Claim
14 words
The source of claim 8, wherein the extraction electrode is of a magnetic material.
Claim 22
Dependent Claim
14 words
The source of claim 9, wherein the extraction electrode is of a magnetic material.
Claim 23
Dependent Claim
14 words
The source of claim 10, wherein the extraction electrode is of a magnetic material.
Claim 24
Dependent Claim
14 words
The source of claim 12, wherein the extraction electrode is of a magnetic material.
Claim 25
Dependent Claim
14 words
The source of claim 12, wherein the extraction electrode is of a magnetic material.
Claim 26
Dependent Claim
22 words
The source of claim of claim 1, wherein the cathode is semicylindrical with the hollow anode aperture in the center of curvature.
Claim 27
Dependent Claim
22 words
The source of claim of claim 7, wherein the cathode is semicylindrical with the hollow anode aperture in the center of curvature.
Claim 28
Dependent Claim
22 words
The source of claim of claim 10, wherein the cathode is semicylindrical with the hollow anode aperture in the center of curvature.
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) | 1992-10-02 | 1993-04-03 | 1993-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-02 | 1997-04-03 | 1997-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-02 | 2001-04-03 | 2001-10-03 | $7700.00 | Window Closed / Lapsed |