US3431523A - Superconductive quadripole with magnetic focusing - Google Patents

Superconductive quadripole with magnetic focusing Download PDF

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Publication number
US3431523A
US3431523A US631739A US3431523DA US3431523A US 3431523 A US3431523 A US 3431523A US 631739 A US631739 A US 631739A US 3431523D A US3431523D A US 3431523DA US 3431523 A US3431523 A US 3431523A
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United States
Prior art keywords
core
quadripole
winding
coil
superconductive
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Expired - Lifetime
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US631739A
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English (en)
Inventor
Lucien J Donadieu
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Alcatel Lucent SAS
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Compagnie Generale dElectricite SA
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F6/00—Superconducting magnets; Superconducting coils
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/20—Electromagnets; Actuators including electromagnets without armatures
    • H01F7/202—Electromagnets for high magnetic field strength
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
    • H01J29/58—Arrangements for focusing or reflecting ray or beam
    • H01J29/64—Magnetic lenses
    • H01J29/66—Magnetic lenses using electromagnetic means only
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S505/00—Superconductor technology: apparatus, material, process
    • Y10S505/825—Apparatus per se, device per se, or process of making or operating same
    • Y10S505/871—Magnetic lens

Definitions

  • One difliculty in making superconductive quadripoles is to find a mechanical structure which stands up to electromagnetic forces exerted between the coils when current is flowing through them, which may be of the order of tons.
  • An aim of the present invention is to construct a superconductive quadripole with magnetic focusing which is resistance to internal electromagnetic forces, while obtaining a magnetic field gradient of great homogeneity.
  • the invention consists in an electric coil for a quadripole with magnetic focusing, comprising a core having a metallic element of prismatic form, the section of which is substantially in the form of two isosceles trapeziums, with their small base in common. They are provided on their end faces with end pieces, and an electric winding is wound on the core parallel to the generatrices of the prism.
  • the angle for-med by one of the trapeziums of the section of the core has a value between 30- and 50, preferably 40".
  • the invention also consists in a method of winding a coil as set forth above, in which the core of the coil is fixed on the shaft of a winding machine and the winding is retained laterally by side pieces formed by the stacking of small rods, put in place as and when its thickness increases.
  • FIGURE 1 is a section of the core of a coil of the quadripole in accordance with one embodiment of the invention
  • FIGURE 2 is a section of a coil provided with a core in accordance with a variation
  • FIGURE 3 is a view in elevation of the core in accordance with FIGURE 2;
  • FIGURE 4 is a section of the quadripole through a plane perpendicular to its axis
  • FIGURE 5 is a perspective view of the core provided with a winding
  • FIGURE 6 is a perspective view of an element of the shell of the quadripole.
  • FIGURE 7 is a perspective view of the quadripole in a partly assembled form.
  • the core of the coil is comprised essentially of a prismatic metallic portion terminated by end pieces of plastic material.
  • FIGURE 1 shows a section of the prism in one embodiment.
  • the section has the shape of two isosceles trapeziums 3 and 4 having their small base in common.
  • FIGURE 2 is a section of the winding assembly in which the core is produced, in accordance with a variation, and in which the large base of the trapezium 3 is replaced by a quadrant presenting its concavity outwardly.
  • the angle formed by the sides 41 and 42 of the trapezium 4 is between 30 and 50, and is preferably equal to 40. This feature makes it possible, as will be seen below, to have the magnetic field gradient of great homogeneity for the quadripole.
  • FIGURE 3 is a view of the core in accordance with the embodiment of FIGURE 2.
  • the end faces 5 and 6 of the metallic portion of the core are planar, the dihedral angle formed by their respective planes with a plane perpendicular to the generatrices of the prism being between 10 and 30, preferably approximately 17.
  • the metallic core is provided with two end pieces 7 and 8, preferably of plastic material and in particular, polytet-rafluoroethylene, a polyamide (for instance, nylon) or polyethylene. These tips have substantially the shape of two truncated cones having the same axis and a common base, abutting on the planar end faces of the metallic element of the core. These tips are fixed to the metallic element, for instance, by screws, such as 9.
  • the coil 10 can be manufactured by Winding a superconductive cable around the core, parallel to the generatrices of the prism, in several layers.
  • the core is mounted on the shaft of a winding machine by means of a central hole 50 having an axis perpendicular to the edges of the core and parallel to the plane of symmetry of the core.
  • This winding is retained laterally, on the one hand by the sides 31 and 32 of the core, and on the other hand by side pieces 33 and 34, each constituted by a plurality of short rods 35 screwed in sequence onto each other, the first of them being fixed on a surface plane 3'7 formed at the base of the core.
  • brass or duraluminum will be used for this purpose.
  • the cable constituting the winding is, for instance, a single strand insulated niobium-zirconium cable that can withstand a current strength of approximately 175 A./ mm.
  • the cylindrical space is designated by the reference number 59.
  • the shell is preferably formed of four identical elements 61, 62, 6'3 and 64.
  • FIGURE 6 shows a perspective view of one such element.
  • One coil such as 71, 72, 73 and 74, is fixed to each element, together with its winding, by means of screws, such as 75.
  • the directions of the currents in the coils 71"to 74 are selected in such a way that the system is equivalent to four trapezoidal coils A, B, C, D with the opposed trapezoidal coils constituting two like poles, and the intervening coils constituting two unlike poles.
  • FIGURE 4 The directions of the currents are shown in FIGURE 4, where a sign is the symbol for a current passing from the rear to the front of the plane of the sheet.
  • two end conductors J and K of the coils A, B, C, D are located at equal distance from the center of the space 59.
  • the distance separating the point 0 from the base of the line perpendicular to JK has the reference b and the distance JK has the reference a.
  • the elements of the shell are assembled together by rods and screws placed in bores, such as 76.
  • FIGURE 7 shows a perspective view of the quadripole in the course of assembly; three of the four coils are already assembled together and on the corresponding shell elements.
  • the shell is closed at its ends by discs, preferably of soft iron (not shown), which restricts the leakage field of the quadripole.
  • An electric coil assembly for effecting magnetic field focusing within a quadripole structure comprising: a core including a metallic element of prismatic form and having a cross-section substantially in the form of two isosceles trapeziums with their small base in common, and an electric winding carried by said core and wound thereon parallel to the generatrices of the prism.
  • each end face comprises a tip in the form of two coaxial truncated semicones attached together by their common small base.
  • the core includes a central hole, the axis of which is perpendicular to the edges of the core and parallel to the plane of symmetry of the core.
  • the core assembly as claimed in claim 1 wherein said core comprises antimagnetic metal such as brass or duraluminum.
  • Quadripole with magnetic focusing comprising a metallic shell and four identical coil assemblies, each coil assembly comprising a core including a metallic element of prismatic form having a cross-section substantially in the form of two isosceles trapeziums with their small base in common, an electric winding wound on the core parallel to the generatrices of the prism, and means for circumferentially arranging said coil assembly such that the bases of the radially inner trapeziums define a space of substantially cylindrical shape.
  • the quadripole as claimed in claim 12 in which the shell is formed of four identical, joined shell elements and means for coupling the coil assemblies respectively to said elements.
  • the quadripole as claimed in claim 13 further including means for demountably coupling said shell elements together to form a cylindrical assembly.
  • the quadripole as claimed in claim 15 further including end pieces coupled to respective end faces of said core, said end pieces being formed of a plastic material from the group comprising polytetrafluoroethylene, polyamide and polyethylene.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)
  • Particle Accelerators (AREA)
  • Coils Or Transformers For Communication (AREA)
US631739A 1966-04-21 1967-04-18 Superconductive quadripole with magnetic focusing Expired - Lifetime US3431523A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR58399A FR1504463A (fr) 1966-04-21 1966-04-21 Quadrupôle de focalisation magnétique

Publications (1)

Publication Number Publication Date
US3431523A true US3431523A (en) 1969-03-04

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US631739A Expired - Lifetime US3431523A (en) 1966-04-21 1967-04-18 Superconductive quadripole with magnetic focusing

Country Status (9)

Country Link
US (1) US3431523A (ref)
BE (1) BE697060A (ref)
CH (1) CH471460A (ref)
DE (1) DE1589594C3 (ref)
FR (1) FR1504463A (ref)
GB (1) GB1169075A (ref)
LU (1) LU53449A1 (ref)
NL (1) NL6705529A (ref)
SE (1) SE342347B (ref)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3491318A (en) * 1968-08-16 1970-01-20 Atomic Energy Commission Baseball seam magnet with variable magnetic field
US3582849A (en) * 1969-12-03 1971-06-01 Atomic Energy Commission Electromagnetic apparatus for producing and containing high temperature plasmas
US4189693A (en) * 1977-12-28 1980-02-19 The United States Of America As Represented By The United States Department Of Energy Superconducting magnet
US4271585A (en) * 1977-12-28 1981-06-09 The United States Of America As Represented By The United States Department Of Energy Method of constructing a superconducting magnet
US4673881A (en) * 1984-11-15 1987-06-16 Siemens Aktiengesellschaft Magnetic apparatus of a nuclear spin tomography system with an approximately hollow-cylindrical shielding device
US4949047A (en) * 1987-09-24 1990-08-14 The Boeing Company Segmented RFQ accelerator
US5347254A (en) * 1993-03-08 1994-09-13 The United States Of America As Represented By The Secretary Of The Army Tubular structure having transverse magnetic field with gradient

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3284744A (en) * 1964-09-03 1966-11-08 Gordon T Danby Quadrupole magnet with reduced lateral dimension
US3356976A (en) * 1965-11-10 1967-12-05 William B Sampson Quadrupole magnet
US3370349A (en) * 1963-07-25 1968-02-27 Avco Corp Method of manufacturing electrical conducting winding

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3370349A (en) * 1963-07-25 1968-02-27 Avco Corp Method of manufacturing electrical conducting winding
US3284744A (en) * 1964-09-03 1966-11-08 Gordon T Danby Quadrupole magnet with reduced lateral dimension
US3356976A (en) * 1965-11-10 1967-12-05 William B Sampson Quadrupole magnet

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3491318A (en) * 1968-08-16 1970-01-20 Atomic Energy Commission Baseball seam magnet with variable magnetic field
US3582849A (en) * 1969-12-03 1971-06-01 Atomic Energy Commission Electromagnetic apparatus for producing and containing high temperature plasmas
US4189693A (en) * 1977-12-28 1980-02-19 The United States Of America As Represented By The United States Department Of Energy Superconducting magnet
US4271585A (en) * 1977-12-28 1981-06-09 The United States Of America As Represented By The United States Department Of Energy Method of constructing a superconducting magnet
US4673881A (en) * 1984-11-15 1987-06-16 Siemens Aktiengesellschaft Magnetic apparatus of a nuclear spin tomography system with an approximately hollow-cylindrical shielding device
US4949047A (en) * 1987-09-24 1990-08-14 The Boeing Company Segmented RFQ accelerator
US5347254A (en) * 1993-03-08 1994-09-13 The United States Of America As Represented By The Secretary Of The Army Tubular structure having transverse magnetic field with gradient

Also Published As

Publication number Publication date
FR1504463A (fr) 1967-12-08
NL6705529A (ref) 1967-10-23
DE1589594A1 (de) 1970-05-14
CH471460A (fr) 1969-04-15
BE697060A (ref) 1967-10-16
DE1589594C3 (de) 1978-10-05
SE342347B (ref) 1972-01-31
LU53449A1 (ref) 1968-12-11
DE1589594B2 (de) 1978-02-16
GB1169075A (en) 1969-10-29

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