US4038622A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Superconducting dipole electromagnet
Assignee: Energy Research and Development Administration ERDA
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Filing: 1976-04-13
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Granted: 1977-07-26
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Expires: 1996-04-13
Abstract
Abstract A dipole electromagnet of especial use for bending beams in particle accelerators is wound to have high uniformity of magnetic field across a cross section and to decrease evenly to zero as the ends of the electromagnet are approached by disposing the superconducting filaments of the coil in the crescent-shaped nonoverlapping portions of two intersecting circles. Uniform decrease at the ends is achieved by causing the circles to overlap increasingly in the direction of the ends of the coil until the overlap is complete and the coil is terminated.
Inventors
- 👤 John R. Purcell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:28
CPC Classifications
H; H01; H01F; H01F6/00; H01F6/06; H01F7/00; H01F7/06; H01F7/20; H01F7/202; Y; Y10; Y10S; Y10S505/00; Y10S505/825; Y10S505/879
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
327 words
A superconducting dipole electromagnet wound of wires formed by a filament of superconducting material embedded in a normal conductor that is enclosed in an electrically insulating material, the electromagnet exhibiting cylindrical symmetry about an axis, the electromagnet comprising: a. a central portion of said wires disposed substantially parallel to each other and to the axis of cylindrical symmetry, the wires in said central portion disposed in two crescent-shaped cross-sections defined by non-intersecting portions of two equal circles having centers on a line through the axis and perpendicular to the axis, the centers equidistant from the axis, the wires in one of said two crescent-shaped cross-sections disposed to carry electric current in a first direction parallel to the axis and the wires in the other of said two crescent-shaped cross-sections carrying electric current in an opposite direction; b. a first terminating portion of said wires connected electrically to the central portion at a first end to form a plurality of looping portions, each of said looping portions connecting wires from one of said crescent-shaped cross-sections to wires in the other of said crescent-shaped portions and continuing an electric circuit therethrough, the fractional number of wires in each of said looping portions equalling the reciprocal of the number of said plurality, further unlooped portions of said wires disposed in cross-sections bounded by arcs of two bounding circles equal in size to said two equal circles, the centers of the bounding circles moving into coincidence upon approaching an end of the magnet; and c. a second terminating portion of said wires connected to the central portion at a second end opposite to said first end and exhibiting mirrored symmetry to said first terminating portion, the second terminating portion carrying electric current connected to continue an electric circuit from wires in one of said crescent-shaped cross-sections to wires in the other, whereby the second terminating portion forms with the first terminating portion and the central portion a continuous current-carrying dipole electromagnet.
Claim 2
Dependent Claim
327 words
A superconducting dipole electromagnet wound of wires formed by a filament of superconducting material embedded in a normal conductor that is enclosed in an electrically insulating material, the electromagnet exhibiting cylindrical symmetry about an axis, the electromagnet comprising: a. a central portion of said wires disposed substantially parallel to each other and to the axis of cylindrical symmetry, the wires in said central portion disposed in two crescent-shaped cross-sections defined by non-intersecting portions of two equal circles having centers on a line through the axis and perpendicular to the axis, the centers equidistant from the axis, the wires in one of said two crescent-shaped cross-sections disposed to carry electric current in a first direction parallel to the axis and the wires in the other of said two crescent-shaped cross-sections carrying electric current in an opposite direction; b. a first terminating portion of said wires connected electrically to the central portion at a first end to form a plurality of looping portions, each of said looping portions connecting wires from one of said crescent-shaped cross-sections to wires in the other of said crescent-shaped portions and continuing an electric circuit therethrough, the fractional number of wires in each of said looping portions equalling the reciprocal of the number of said plurality, further unlooped portions of said wires disposed in cross-sections bounded by arcs of two bounding circles equal in size to said two equal circles, the centers of the bounding circles moving into coincidence upon approaching an end of the magnet; and c. a second terminating portion of said wires connected to the central portion at a second end opposite to said first end and exhibiting mirrored symmetry to said first terminating portion, the second terminating portion carrying electric current connected to continue an electric circuit from wires in one of said crescent-shaped cross-sections to wires in the other, whereby the second terminating portion forms with the first terminating portion and the central portion a continuous current-carrying dipole electromagnet.
Claim 3
Dependent Claim
39 words
The electromagnet of claim 1 wherein the looping portions of each adjacent pair of looping portions are separated by nonmagnetic spacers bounded on the inside by arcs equal to the arcs of the bounding circles of the unlooped wires.
Claim 4
Dependent Claim
186 words
A dipole electromagnet for generating a magnetic field perpendicular to an axis of cylindrical symmetry of the electromagnet comprising: a central portion of superconducting wires disposed substantially parallel to the axis in two crescent-shaped cross-sections formed by the nonintersecting portions of two overlapping circles of equal area; a first end region connected to the central portion at a first end thereof, the first end region comprising a plurality of bundles of approximately equal numbers of looping superconducting wires, each of the looping wires disposed in a plane substantially perpendicular to the axis of the dipole electromagnet and connecting a wire in one of said two crescent-shaped cross-sections to a wire in the other of said two crescent-shaped cross-sections to form with said wires a portion of an electric circuit; and a second end region connected to the central region at a second end view thereof, the second end region symmetrically identical to the first end region and forming therewith an electrical interconnection for carrying current through said wires, whereby the interconnection of the central portion and the first and second end regions forms a dipole electromagnet.
Claim 5
Dependent Claim
186 words
A dipole electromagnet for generating a magnetic field perpendicular to an axis of cylindrical symmetry of the electromagnet comprising: a central portion of superconducting wires disposed substantially parallel to the axis in two crescent-shaped cross-sections formed by the nonintersecting portions of two overlapping circles of equal area; a first end region connected to the central portion at a first end thereof, the first end region comprising a plurality of bundles of approximately equal numbers of looping superconducting wires, each of the looping wires disposed in a plane substantially perpendicular to the axis of the dipole electromagnet and connecting a wire in one of said two crescent-shaped cross-sections to a wire in the other of said two crescent-shaped cross-sections to form with said wires a portion of an electric circuit; and a second end region connected to the central region at a second end view thereof, the second end region symmetrically identical to the first end region and forming therewith an electrical interconnection for carrying current through said wires, whereby the interconnection of the central portion and the first and second end regions forms a dipole electromagnet.
Claim 6
Dependent Claim
58 words
The apparatus of claim 3 comprising in addition a plurality of nonmagnetic spacers, one of each of said spacers disposed between two adjacent bundles of looping wires, each of said spacers being a disc extending beyond said bundles of looping wires and cut with a circular radius to pass nonlooping wires parallel to the axis of the electromagnet.
Claim 7
Dependent Claim
14 words
The apparatus of claim 3 wherein the superconducting wires are niobium-titanium embedded in copper.
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) | 1980-07-25 | 1981-01-24 | 1981-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-25 | 1985-01-24 | 1985-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-25 | 1989-01-24 | 1989-07-26 | $7700.00 | Window Closed / Lapsed |