US3787747A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Periodic magnetically focused beam tube
Assignee: Varian Medical Systems Inc
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Filing: 1972-08-07
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Granted: 1974-01-22
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Expires: 1992-08-07
Abstract
Abstract The periodic magnet structure for a periodically focused beam tube is formed by a single pair of homogeneous slabs of magnetizable material that are permanently magnetized with a pattern of magnetic poles of alternating polarity taken along the direction of the beam path. In a sheet beam tube of preferred geometry, a pair of ceramic slabs are disposed to straddle the sheet beam and the internal planar faces of the ceramic slabs have circuits printed thereon for: electrical connections to all elements, beam forming electrodes, microwave interaction structure, edge focusing electrodes, and the beam collector electrode structure. The permanently magnetized slabs are disposed external to the vacuum envelope, straddling the printed circuit ceramic slabs, for focusing the beam.
Inventors
- 👤 A Scott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:05
CPC Classifications
H; H01; H01J; H01J21/00; H01J21/02; H01J21/18; H01J23/00; H01J23/02; H01J23/08; H01J23/087; H01J23/0873
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
115 words
In a magnetically focused beam tube, an evacuable envelope structure, means within said envelope for forming and projecting a beam of charged particles over a predetermined beam path, electrical circuit means disposed along the beam path in electromagnetic wave energy exchanging relation with the beam of charged particles, periodic magnetic focus means disposed along the beam path for producing a periodic magnetic field within the beam path for focusing the beam along a predetermined beam path, said periodic magnetic focus means including, a generally homogeneous structure consisting of permanently magnetizable material, said magnetizable structure being permanently magnetized in a pattern of periodic permanent poles of alternating polarity taken in a direction along the beam path.
Claim 2
Dependent Claim
115 words
In a magnetically focused beam tube, an evacuable envelope structure, means within said envelope for forming and projecting a beam of charged particles over a predetermined beam path, electrical circuit means disposed along the beam path in electromagnetic wave energy exchanging relation with the beam of charged particles, periodic magnetic focus means disposed along the beam path for producing a periodic magnetic field within the beam path for focusing the beam along a predetermined beam path, said periodic magnetic focus means including, a generally homogeneous structure consisting of permanently magnetizable material, said magnetizable structure being permanently magnetized in a pattern of periodic permanent poles of alternating polarity taken in a direction along the beam path.
Claim 3
Dependent Claim
59 words
The apparatus of claim 1 wherein said beam forming means forms a sheet-shaped beam, and wherein said homogeneous structure includes, a generally homogeneous permanently magnetizable member disposed on one side of said sheet-shaped beam and said magnetizable member being permanently magnetized in a pattern having periodic permanent poles of alternating polarity taken in a direction along the beam path.
Claim 4
Dependent Claim
24 words
The apparatus of claim 1 wherein the period of said pattern of permanent magnetic poles changes in a direction taken along the beam path.
Claim 5
Dependent Claim
16 words
The apparatus of claim 1 wherein said magnetizable structure has an even surface facing said beam.
Claim 6
Dependent Claim
25 words
The apparatus of claim 2 wherein said magnetizable structure comprises a slab of substantially homogeneous permanently magnetizable material having a planar face facing said beam.
Claim 7
Dependent Claim
16 words
The apparatus of claim 5 wherein said magnet slab is a slab of ferrite magnet material.
Claim 8
Dependent Claim
22 words
The apparatus of claim 5 wherein said magnet slab is a slab of permanently magnetizable magnet particles embedded in a binder material.
Claim 9
Dependent Claim
17 words
The apparatus of claim 7 wherein said binder material is flexible such that said slab is flexible.
Claim 10
Dependent Claim
74 words
The apparatus of claim 2 including, a dielectric slab having major and minor faces with a major face disposed facing a major face of said sheet-shaped beam, and wherein said magnetizable member includes a slab of substantially homogeneous permanently magnetizable material disposed overlaying said dielectric slab, and said magnetic slab member having major and minor faces, and a major face of said magnetic member being disposed facing a major face of said dielectric slab.
Claim 11
Dependent Claim
40 words
The apparatus of claim 9 wherein said permanently magnetizable structure includes a pair of said magnetizable slabs disposed on opposite sides of said sheet-shaped beam with their respective major faces disposed facing a corresponding major face of said sheet-shaped beam.
Claim 12
Dependent Claim
33 words
The apparatus of claim 9 wherein said electrical circuit is a microwave interaction structure formed on said major face of said dielectric slab which faces the corresponding major face of said sheet-shaped beam.
Claim 13
Dependent Claim
44 words
The apparatus of claim 11 including, electrostatic edge focusing electrode means disposed adjacent the edge regions of said slow wave circuit in electrical insulative relation thereto and extending along the opposte edges of said sheet-shaped beam for constraining lateral expansion of said sheet-shaped beam.
Claim 14
Dependent Claim
29 words
The apparatus of claim 12 wherein said edge focusing electrode means is disposed on said major face of said dielectric slab which faces said major face of said beam.
Claim 15
Dependent Claim
117 words
The apparatus of claim 13 wherein the beam of charged particles is a beam of electrons, and wherein said beam forming and projecting means includes a thermionic cathode emitter means disposed at the upstream end of said beam path for generating the beam of electrons, current carrying a lead means for supplying heater current to said thermionic cathode emitter, and wherein said dielectric slab has an even major face facinG said corresponding major face of said electron beam, and wherein said slow wave circuit, edge focusing electrode means, and said heater lead means are all formed directly on and lie substantially entirely on said even major face of said dielectric slab which faces said sheet-shaped electron beam.
Claim 16
Dependent Claim
16 words
The apparatus of claim 14 wherein said even major face of said dielectric slab is planar.
Claim 17
Dependent Claim
33 words
The apparatus of claim 15 including beam collector electrode means disposed on and lying substantially entirely on said planar major face of said dielectric slab at the terminal end of said beam path.
Claim 18
Dependent Claim
44 words
The apparatus of claim 16 including, beam focus electrode structure disposed on and lying substantially entirely on said planar major face of said dielectirc slab at the upstream end of said beam path intermediate said cathode emitter means and said slow wave circuit means.
Claim 19
Dependent Claim
75 words
The apparatus of claim 11 wherein said electrical circuit means includes a pair of elongated microwave interaction structure means disposed of said major face of said dielectirc slab in end-to-end relation, and wherein said beam forming and projecting means includes a thermionic cathode emitter disposed intermediate the adjacent ends of said pair of microwave interaction structure means for projecting a pair of electron beams in opposite direction along said pair of microwave interaction structure means.
Claim 20
Dependent Claim
36 words
The apparatus of claim 11 wherein said electrical circuit means includes a plurality of elongated microwave interaction structure means disposed on and lying substantially entirely on said major face of said dielectric slab in side-by-side relation.
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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) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |