US3723733A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stigmatic, crossed-field velocity filter
Assignee: Raytheon Co
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Filing: 1971-05-12
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Granted: 1973-03-27
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Expires: 1991-05-12
Abstract
Abstract A stigmatic, crossed-field velocity filter for nondeflection purification of an ion beam employs shaped electrodes to increase the uniformity of the electric field and employs shaped magnetic pole pieces to produce a nonuniform magnetic field for stigmatic passage of the selected ion species through the filter.
Inventors
- 👤 R Seliger
- 👤 R Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:40
CPC Classifications
H; H01; H01J; H01J37/00; H01J37/30; H01J37/317; H01J37/3171; H01J37/02; H01J37/04; H01J37/05
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
74 words
A crossed-field filter for purification of a charged particle beam comprising: a tube having an axis defining the position of a charged particle beam therethrough; first and second electrodes positioned to form a substantially uniform electric field adjacent said axis; a magnet for producing a magnetic field which is graded in strength between said first and second electrodes so that charged particle deflection is axisymmetric as a charged particle beam passes along said axis.
Claim 2
Dependent Claim
74 words
A crossed-field filter for purification of a charged particle beam comprising: a tube having an axis defining the position of a charged particle beam therethrough; first and second electrodes positioned to form a substantially uniform electric field adjacent said axis; a magnet for producing a magnetic field which is graded in strength between said first and second electrodes so that charged particle deflection is axisymmetric as a charged particle beam passes along said axis.
Claim 3
Dependent Claim
19 words
The filter of claim 1 wherein said electrodes are shaped to provide a substantially uniform field adjacent said axis.
Claim 4
Dependent Claim
23 words
The filter of claim 2 wherein said electrodes have a uniform cross section of at least a portion thereof which faces said axis.
Claim 5
Dependent Claim
25 words
The filter of claim 3 wherein each of said electrodes has a substantially planar face and a protuberant nose adjacent each edge of said face.
Claim 6
Dependent Claim
14 words
The filter of claim 4 wherein said nose terminates in a substantially hemicircular section.
Claim 7
Dependent Claim
24 words
The filter of claim 1 wherein said magnetic field is produced by shaped magnetic pole faces on poles which are connected to said magnet.
Claim 8
Dependent Claim
19 words
The filter of claim 6 wherein said magnetic pole faces are each substantially planar, with said planes being convergent.
Claim 9
Dependent Claim
20 words
The filter of claim 7 wherein said planes converge to define a line which is substantially parallel to said axis.
Claim 10
Dependent Claim
27 words
The filter of claim 7 wherein said planes converge at a distance from axis equal to substantially twice the cyclotron radius of charged particles in said beam.
Claim 11
Dependent Claim
19 words
The filter of claim 9 wherein said electrodes are shaped to provide a substantially uniform field adjacent said axis.
Claim 12
Dependent Claim
23 words
The filter of claim 10 wherein said electrodes have a uniform cross section of at least a portion thereof which faces said axis.
Claim 13
Dependent Claim
25 words
The filter of claim 11 wherein each of said electrodes has a substantially planar face and a protuberant nose adjacent each edge of said face.
Claim 14
Dependent Claim
14 words
The filter of claim 12 Wherein said nose terminates in a substantially hemicircular section.
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) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |