US3587013A
Expired / Lapsed
US
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Magnetic lens device for corpuscular ray apparatus operating under vacuum
Assignee: Siemens AG
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Filing: 1969-05-02
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Granted: 1971-06-22
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Expires: 1989-05-02
Abstract
Abstract A magnetic lens device for corpuscular ray apparatus to operate under vacuum is equipped with a pair of tubular shielding cylinders of superconductive material coaxially surrounding the lens axis and spaced from each other along said axis. Cryogenic means are thermally connected with the cylinders, and lens windings surround the cylinders for generating a magnetic field. The respective cylinders terminate in end faces directed toward each other and defining between each other a lens gap in which the cylinders concentrate the field near the axis. According to the invention proper, the shielding cylinders comprise respective end portions of superconductive material of higher currentcarrying capacity than the remaining portion of each cylinder, said end faces at said lens gap being formed by said respective end portions.
Inventors
- 👤 Isolde Dietrich
- 👤 Reinhard Weyl
- 👤 Helmut Zerbst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:30
CPC Classifications
H; H01; H01J; H01J37/00; H01J37/02; H01J37/04; H01J37/09; H01J37/10; H01J37/14; H01J37/141; H01J37/1416; Y; Y10; Y10S; Y10S505/00; Y10S505/825; Y10S505/871
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
127 words
A magnetic lends device for corpuscular ray apparatus to operate under vacuum, a pair of tubular shielding cylinders of superconductive material coaxially surrounding the lens axis and spaced from each other along said axis, cryogenic means thermally connected with said cylinders, lens winding means surrounding said cylinders for generating a magnetic field, said cylinders terminating in a pair of end faces directed toward each other and other a lens gap between each other a lens gap in which said cylinders concentrate said field near said axis, in combination with the improvement according to which said shielding cylinders comprise respective end portions having a higher superconductance than the remaining portion of said respective cylinders, said end faces at said lens gap being formed by said respective end portions.
Claim 2
Dependent Claim
127 words
A magnetic lends device for corpuscular ray apparatus to operate under vacuum, a pair of tubular shielding cylinders of superconductive material coaxially surrounding the lens axis and spaced from each other along said axis, cryogenic means thermally connected with said cylinders, lens winding means surrounding said cylinders for generating a magnetic field, said cylinders terminating in a pair of end faces directed toward each other and other a lens gap between each other a lens gap in which said cylinders concentrate said field near said axis, in combination with the improvement according to which said shielding cylinders comprise respective end portions having a higher superconductance than the remaining portion of said respective cylinders, said end faces at said lens gap being formed by said respective end portions.
Claim 3
Dependent Claim
23 words
In a lens device according to claim 1, said end portions consisting of superconductive material of higher current-carrying capacity than said remaining portions.
Claim 4
Dependent Claim
37 words
In a lens device according to claim 2, said end faces of said end portions of the higher current-carrying capacity having a generally convex shape corresponding to the configuration of the lens field lines at said gap.
Claim 5
Dependent Claim
26 words
In a lens device according to claim 2, said end portions being made of more finely granular superconductor material than said other portions of said cylinders.
Claim 6
Dependent Claim
46 words
In a lens device according to claim 2, said end portion and said other portion of each of said cylinders being made of the same superconductor starting material, and said end portion having conductivity-increasing lattice defects in said material to thereby exhibit said higher current-carrying capacity.
Claim 7
Dependent Claim
15 words
In a lens device according to claim 1, said shielding cylinders consisting substantially of Nb3Sn.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |