Patent US2296160A successfully refreshed from Google Patents.
Patent US3731241A successfully refreshed from Google Patents.
US3731241A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical coils for generating magnetic fields
Assignee: Science Research Council
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Filing: 1970-09-11
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Granted: 1973-05-01
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Expires: 1990-09-11
Abstract
Abstract A novel approach to the mathematical analysis of the magnetic field produced by the coil windings of accelerator beam bending/focussing magnets has led to the proposal for inserting accurately located and dimensioned azimuthal spaces in the windings. The spaces provide a simple means for improving the uniformity of the magnetic field. A mathematically specified pattern of end winding reduces their disturbing influence.
Inventors
- 👤 J Coupland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:49
CPC Classifications
H; H01; H01F; H01F7/00; H01F7/06; H01F7/20; H01F7/202; G; G21; G21K; G21K1/00; G21K1/08; G21K1/093; H01F6/00; H01F6/06; H01J; H01J29/00; H01J29/46; H01J29/70; H01J29/72; H01J29/76; H01J29/762; Y; Y10; Y10S; Y10S505/00; Y10S505/825; Y10S505/871; Y10S505/879
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
202 words
An electrical coil for generating a magnetic field of order N, which coil is of the form in which the windings lie in a bundle between two parallel planes spaced apart, the windings lying in two side runs and two end runs where the windings cross from one side run to the other, the general direction of the lengths of the windings in the two side runs being parallel to the said two planes, the side runs being substantially longer than the end runs so that the magnetic field is principally defined by the side runs, the windings being arranged so that there is at least one region, but not more than 4N regions, each region being defined in cross-section by an area within each perimeter respectively of the bundle of windings as seen in cross-section in the two side runs, from which region the windings are absent, the number of windings per unit crosssectional area in the side runs being substantially constant throughout the regions where the windings are present, and the location and extent of the region or regions where the windings are absent being selected to enhance the uniformity or purity of the magnetic field generated by the coil.
Claim 2
Dependent Claim
202 words
An electrical coil for generating a magnetic field of order N, which coil is of the form in which the windings lie in a bundle between two parallel planes spaced apart, the windings lying in two side runs and two end runs where the windings cross from one side run to the other, the general direction of the lengths of the windings in the two side runs being parallel to the said two planes, the side runs being substantially longer than the end runs so that the magnetic field is principally defined by the side runs, the windings being arranged so that there is at least one region, but not more than 4N regions, each region being defined in cross-section by an area within each perimeter respectively of the bundle of windings as seen in cross-section in the two side runs, from which region the windings are absent, the number of windings per unit crosssectional area in the side runs being substantially constant throughout the regions where the windings are present, and the location and extent of the region or regions where the windings are absent being selected to enhance the uniformity or purity of the magnetic field generated by the coil.
Claim 3
Dependent Claim
24 words
An electrical coil as claimed in claim 1, wherein the windings in the said two side runs are straight and parallel with one another.
Claim 4
Dependent Claim
69 words
An electrical coil for generating a magnetic field as claimed in claim 2 wherein the windings of the coil, as seen in cross-section, are distributed within boundaries defined by concentric circles and generally radially extending lines at the azimuthal limits of the coil windings, and wherein the said area defining the region from which the windings are absent is an area within the said boundaries as seen in cross-section.
Claim 5
Dependent Claim
29 words
An electrical coil as claimed in claim 3, wherein the said area defining the region comprises a sector of the outer circular boundary truncated by the inner circular boundary.
Claim 6
Dependent Claim
30 words
An electrical coil as claimed in claim 3, wherein the coil windings are divided by azimuthal spacers inserted in the windings, the spacers occupying the said regions as defined above.
Claim 7
Dependent Claim
82 words
An electrical coil as claimed in claim 5, wherein, for generating a uniform dipole magnetic field, the arrangement comprises coil windings which, as seen in cross-section, are within boundaries defined by concentric circles, the azimuthal limits of the coil windings being at 67.40* in each quadrant measured from a reference axis, and spacers in each quadrant, the azimuthal extent of the spacers being from 43.50* to 52.60* measured from the reference axis, the coil windings being otherwise uniformly distributed within the boundaries.
Claim 8
Dependent Claim
74 words
An electrical coil as claimed in claim 5, wherein, for generating a quadrupole field of high purity, the azimuthal limits of the coil windings, of which There are two in each quadrant defining four magnetic pole regions, are at 33.70* in each quadrant measured from mutually perpendicular reference axes, and the azimuthal extents of the spacers, of which there are two in each quadrant, are from 21.75* to 26.30* measured from the reference axes.
Claim 9
Dependent Claim
72 words
An electrical coil as claimed in claim 6, wherein, for generating a magnetic field of order N, the azimuthal limits of the coil windings, of which limits there will be N/2 in each quadrant defining the N magnetic pole regions, and the azimuthal extents of the spacers, of which there are N/2 in each quadrant, are derived by dividing by N/2 the angles mentioned in claim 6 for the dipole field coil.
Claim 10
Dependent Claim
73 words
An electrical coil as claimed in claim 5, wherein, for generating a uniform dipole magnetic field, the arrangement comprises coil windings which, as seen in cross-section, are within boundaries defined by concentric circles, the azimuthal limits of the coil windings being at 71.84* in each quadrant measured from a reference axis, and two spacers in each quadrant, the azimuthal extent of the spacers being from 33.33* to 37.12* and from 53.14* to 63.38*.
Claim 11
Dependent Claim
210 words
An electrical coil for generating a magnetic field, which coil is of the form in which the windings lie in a bundle between two parallel planes spaced apart, the windings lying in two side runs and two end runs where the windings cross from one side run to the other, the general direction of the lengths of the windings in the two side runs being parallel to the said two planes, the side runs being substantially longer than the end runs so that the magnetic field is principally defined by the side runs, the windings in the end runs being arranged so that for any length of winding of azimuthal location theta and inclination phi '' to a z axis defined parallel to the said general direction of the lengths of the windings in the side runs, the following condition is satisfied: A theta cot phi '' + L( theta ) B cos theta where A and B are constants and L( theta ) is the length of the winding continuing in the direction of the side run beyond an end plane, the said end plane being defined as containing the point of diversion from side run to end run of the winding for which L( theta ) is zero.
Claim 12
Dependent Claim
210 words
An electrical coil for generating a magnetic field, which coil is of the form in which the windings lie in a bundle between two parallel planes spaced apart, the windings lying in two side runs and two end runs where the windings cross from one side run to the other, the general direction of the lengths of the windings in the two side runs being parallel to the said two planes, the side runs being substantially longer than the end runs so that the magnetic field is principally defined by the side runs, the windings in the end runs being arranged so that for any length of winding of azimuthal location theta and inclination phi '' to a z axis defined parallel to the said general direction of the lengths of the windings in the side runs, the following condition is satisfied: A theta cot phi '' + L( theta ) B cos theta where A and B are constants and L( theta ) is the length of the winding continuing in the direction of the side run beyond an end plane, the said end plane being defined as containing the point of diversion from side run to end run of the winding for which L( theta ) is zero.
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) | 1976-04-30 | 1976-10-30 | 1977-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-30 | 1980-10-30 | 1981-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-30 | 1984-10-30 | 1985-05-01 | $7700.00 | Window Closed / Lapsed |