Patent US3789335A successfully refreshed from Google Patents.
US3789335A
Expired / Lapsed
US
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Magnetic focusing device for an isochronous cyclotron
Assignee: Thales SA
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Filing: 1971-10-04
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Granted: 1974-01-29
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Expires: 1991-10-04
Abstract
Abstract This device makes it possible to secure a major improvement in the efficiency of particle accelerators of the isochronous cyclotron type. It comprises a soft magnetic yoke, two circular soft-iron plates protuding from said yoke, first and second sets of soft magnetic sectors facing each other and building up the main airgap of the device, these sectors being respectively carried by two plates, two annular spacings being respectively provided between the sectors and their carrying plate, and correcting magnetic means being positioned within said annular spacings.
Inventors
- 👤 P Delphin
- 👤 P Peironet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:37
CPC Classifications
H; H05; H05H; H05H13/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
143 words
A magnetic focusing device for particle accelerators of the isochronous cyclotron type, capable of exciting within a main air gap a controlled magnetic field, said device comprising : a soft magnetic yoke, a first circular soft-iron plate protruding from said yoke and having a first face, a second circular soft-iron plate protruding from said yoke and having a second face facing said first face, first and second sets of soft magnetic sectors building up said main air gap, said first and second sets of soft magnetic sectors being respectively carried by said first and second faces, and correcting means, a first annular spacing being provided between said first face and said first set of magnetic sectors, a second annular spacing being provided between said second face and said second set of magnetic sectors, said correcting magnetic means being positioned within said annular spacings.
Claim 2
Dependent Claim
143 words
A magnetic focusing device for particle accelerators of the isochronous cyclotron type, capable of exciting within a main air gap a controlled magnetic field, said device comprising : a soft magnetic yoke, a first circular soft-iron plate protruding from said yoke and having a first face, a second circular soft-iron plate protruding from said yoke and having a second face facing said first face, first and second sets of soft magnetic sectors building up said main air gap, said first and second sets of soft magnetic sectors being respectively carried by said first and second faces, and correcting means, a first annular spacing being provided between said first face and said first set of magnetic sectors, a second annular spacing being provided between said second face and said second set of magnetic sectors, said correcting magnetic means being positioned within said annular spacings.
Claim 3
Dependent Claim
40 words
A device as claimed in claim 1, wherein said correcting means comprise at least one pair of annular identical windings respectively located within said first and second annular spacings ; said annular windings being centered in relation with said faces.
Claim 4
Dependent Claim
26 words
A device as claimed in claim 1, wherein said correcting means comprise at least two concentric pairs of annular identical windings, constituted with insulated metallic wires.
Claim 5
Dependent Claim
25 words
A device as claimed in claim 1, wherein said sets of magnetic sectors are coupled to the edges of said plates through magnetic conducting elements.
Claim 6
Dependent Claim
19 words
A device as claimed in claim 4, wherein said magnetic conducting elements are circular rings integral with said plates.
Claim 7
Dependent Claim
24 words
A device as claimed in claim 4, wherEin the apices of said sectors are mechanically coupled to said face through spacers of non-magnetic material.
Claim 8
Dependent Claim
21 words
A device as claimed in claim 1, wherein said plates comprise vacuumtight means for providing control of said correcting magnetic means.
Claim 9
Dependent Claim
27 words
A device as claimed in claim 2, wherein the ends of said windings pass through holes of said plates , said holes being sealed by vacuumtight means.
Claim 10
Dependent Claim
28 words
A device as claimed in claim 1, wherein the distance separating said two sets of soft magnetic sectors decreases from the apices of said sectors towards their edges.
References Cited (Backward Citations)
US3024379A
Cited
US3175131A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-28 | 1977-07-30 | 1978-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-28 | 1981-07-30 | 1982-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-28 | 1985-07-30 | 1986-01-29 | $7700.00 | Window Closed / Lapsed |