US3593242A - Liquid cooled magnet coil for particle acceleration - Google Patents

Liquid cooled magnet coil for particle acceleration Download PDF

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Publication number
US3593242A
US3593242A US744126A US3593242DA US3593242A US 3593242 A US3593242 A US 3593242A US 744126 A US744126 A US 744126A US 3593242D A US3593242D A US 3593242DA US 3593242 A US3593242 A US 3593242A
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US
United States
Prior art keywords
conductor
tube
bars
parts
yoke
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Expired - Lifetime
Application number
US744126A
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English (en)
Inventor
Arne Andersson
Hans Klein
Ove Tjernstrom
Carl Ronnevig
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ABB Norden Holding AB
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ASEA AB
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Filing date
Publication date
Application filed by ASEA AB filed Critical ASEA AB
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Publication of US3593242A publication Critical patent/US3593242A/en
Anticipated expiration legal-status Critical
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    • 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
    • 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
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49004—Electrical device making including measuring or testing of device or component part

Definitions

  • a magnet coil for a particle accelerator is formed of a plurality of turns of a conductor each composed of two yoke-shaped parts of conducting material containing a central metallic tube. The tube extends from each end of the pans. The parts are so positioned that the projecting tubes eni$41 MAGNET FOR PARTICLE gage each other, where they are welded together. The inside 3 Chum 2 Draw. a tube is then tested. Conducting members are then placed 8 around the tube in the gaps between the adjacent yoke-shaped parts and are welded to the conductor members. The whole unit is then embodied in insulation.
  • the present invention relates to a liquid-cooled magnet coil for a particle accelerator comprising turns of a relatively thick conductor provided with a cooling channel and surrounded by insulation, several turns being arranged in the same plane, and a method for manufacturing such a coil.
  • magnet coils for the particle accelerator of the abovementioned type it is not only the large cross section of the conductor but also several other requirements which make special demands on the construction if the manufacturing costs are to be kept at a reasonable level.
  • the conductor must be surrounded entirely by insulation since shock voltages of about 30 kv. may arise. It must be possible to make the coils long, for example 5 m., and with small tolerance. Since the conductor is provided with a central cooling channel for liquid cooling the yokes must he joined together so that all risk of leakage-and consequently destroyed insulationis eliminated. During welding it must also be ensured that no molten material penetrates into the cooling channel and causes blockage or throttling, and it is important that the channel opening in one of two yoke ends joined together exactly coincides with the channel opening in the other.
  • an accelerator coil having the properties mentioned in the introduction can be made by shaping a number of yokes of different lengths from a conductor with undivided cross section and a central cooling channel, the end surfaces of the yokes being directly welded to each other so that the coil has two welding seams per turn. Since great reliability is required each welding seam is checked immediately after the welding by inserting the spliced part in a tension testing means and subjecting it to high tensile stress. Possible bubbles or particles of welding flux are then brought to light.
  • This testing method means that the conductor, which during the test must be surrounded by clamps along a relatively long stretch, cannot be wrapped with insulation until the test has been carried out-at least not to any great extent.
  • a magnet coil according to the invention is spliced at at least one relatively short splice stretch per turn and is characterized in that said cooling channel is lined by a metal tube which is joined by means of welding at the central part of said splice section and that along said splice section said conductor is represented by a special conductor part, formed by at least two adjacent parts which are metallically joined at each end to the rest of the conductor.
  • the invention also comprises a method for manufacturing such a magnet coil and is characterized in that each yoke part is built up of a number of copper bars which together form said conductor provided with a cooling channel, the bars being arranged to surround a tube arranged as a lining in the cooling channel, the tube ends projecting from the ends of the bars, afier which said bars are mechanically surrounded along substantially their entire length by a prestressed insulating tape and thus brought into eflective heat-conducting contact with the centrally arranged tube, after which tubes belonging to different yoke-shaped parts are joined together by welding the projecting tube ends, and the tightness of the weld is checked by introducing a pressure medium into the tubes, after which the tube parts not surrounded by copper bars are surrounded by joining bars and the joining bars joined to adjacent yoke-shaped copper bars, after which the joining bars and adjacent, uninsulated parts of the yoke-shaped copper bars are furnished with surrounding insulation.
  • the coil conductor between the splice also sections consists of a number of adjacent parts which are held together and pressed against said tube by means of a layer of strongly prestressed insulating tape surrounding the conductor.
  • FIGS. 1 and 2 show a coil according to the invention at a certain stage in the manufacture.
  • FIG. 2 shows a cross section through the coil along the line B-B in FIG. I and
  • FIG. I shows a section along the line A-A in FIG. 2.
  • the coil is wound from a conductor 1 formed by two bars 10 and lb and having a central channel 2 which is lined with a tube of stainless steel 3.
  • the coil has three turns lying in the same plane.
  • the conductor is surrounded by an insulation layer 4.
  • Each turn consists of two yoke-shaped parts 5 which are bent to the desired shape before assembly and substantially provided with a surrounding insulation which is mechanically applied with the help of equipment for the purpose before the parts are joined and in such a way that the bars Ia and lb are arranged with effective heat-conducting contact in relation to the surrounded tube 3, for example by wrapping them with a strongly prestressed insulating tape.
  • the tube 3 is given greater length that the surrounding, yokeshaped conductor so that the tube ends project at each end of the yoke.
  • the coil is assembled such tube ends are joined by welding seams 6 and this is suitably carried out with an automatic argon welding machine specially developed for welding stainless steel tubes.
  • any unsatisfactory joints are rewelded, After effecting a tube spiral in this way which fulfils the demands for tightness and strength which are made on the cooling system, the pans of the tube not surrounded by the conductor are surrounded by two joining bars 90 and 9b which suitably have the same cross section as the bars la and lb and which are fitted into the corresponding splice section II between the end surfaces 10 of the yoke-shaped conductor which are facing each other. Brazing is then carried out so that the required electrical contact is effected between the yoke-shaped conductors and the joining bars. During the welding the yoke ends are surrounded by water-cooled clamps so that the insulation is not damaged. Finally the joining bars and yoke ends are provided with insulation and the whole coil is then embedded in epoxy resin.
  • the joints of the liquid-containing system are in the form of welded tubes of stainless steel instead of in the form of brazed connections between thick-walled conductor yokes since faults which only result in leakage after some time in operation (for example layers of welding flux or slay) in the latter case form a relatively large percentage of the total number of faults.
  • Liquid-cooled magnet coil for a particle accelerator comprising a plurality of turns of a conductor provided with a cooling channel and surrounded by insulation, several turns being arranged in the same plane, the conductor being spliced at at least one relatively short section per turn, in which said cooling channel is lined by a metal tube which is joined by means of welding at the central part of said splice section and that along said splice section said conductor is constituted by a conductor part, formed by at least two adjacent conductive parts surrounding the metal tube which are joined at each end to the rest of the conductor.
  • Liquid-cooled magnet coil for a particle accelerator in which the magnet coil has two splice sections per turn and the conductor is also formed between the splice sections from two adjacent parts which are held together and pressed against said tube by means of a layer of strongly prestressed insulating tape surrounding the conductor.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Particle Accelerators (AREA)
US744126A 1967-07-12 1968-07-11 Liquid cooled magnet coil for particle acceleration Expired - Lifetime US3593242A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE10473/67A SE318944B (enExample) 1967-07-12 1967-07-12

Publications (1)

Publication Number Publication Date
US3593242A true US3593242A (en) 1971-07-13

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ID=20292381

Family Applications (1)

Application Number Title Priority Date Filing Date
US744126A Expired - Lifetime US3593242A (en) 1967-07-12 1968-07-11 Liquid cooled magnet coil for particle acceleration

Country Status (5)

Country Link
US (1) US3593242A (enExample)
CH (1) CH477802A (enExample)
FR (1) FR1571948A (enExample)
GB (1) GB1223636A (enExample)
SE (1) SE318944B (enExample)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3827017A (en) * 1971-12-07 1974-07-30 Siemens Ag Adjustable induction coil for heating semiconductor rods
US3886509A (en) * 1972-11-24 1975-05-27 Siemens Ag Adjustable induction coil for zone melting of semiconductor rods
US4505824A (en) * 1981-11-02 1985-03-19 Kazuhiko Akamine Method and apparatus for purifying liquid using an electromagnetic filter
US5391863A (en) * 1990-12-22 1995-02-21 Schmidt; Edwin Induction heating coil with hollow conductor collable to extremely low temperature
US5473302A (en) * 1993-04-26 1995-12-05 Top Gulf Coast Corporation Narrow profile transformer having interleaved windings and cooling passage
EP2581135A4 (en) * 2011-08-15 2013-12-04 Shandong Haute Magnet Technology Co Ltd MAGNETIC SEPARATOR WITH A HIGH GRADIENT AND WITH A VERTICAL RING
CN108970806A (zh) * 2018-09-20 2018-12-11 鞍钢集团矿业有限公司 一种立环高梯度磁选机励磁线圈结构
DE102021118450A1 (de) 2021-07-16 2023-01-19 Rolls-Royce Deutschland Ltd & Co Kg Spule

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2564233B1 (fr) * 1984-05-11 1986-10-24 Cogema Inducteur perfectionne pour source a plasma utilisable en spectrometrie d'emission

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2497516A (en) * 1944-04-22 1950-02-14 Metropolitan Eng Co Electrical winding

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2497516A (en) * 1944-04-22 1950-02-14 Metropolitan Eng Co Electrical winding

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3827017A (en) * 1971-12-07 1974-07-30 Siemens Ag Adjustable induction coil for heating semiconductor rods
US3886509A (en) * 1972-11-24 1975-05-27 Siemens Ag Adjustable induction coil for zone melting of semiconductor rods
US4505824A (en) * 1981-11-02 1985-03-19 Kazuhiko Akamine Method and apparatus for purifying liquid using an electromagnetic filter
US5391863A (en) * 1990-12-22 1995-02-21 Schmidt; Edwin Induction heating coil with hollow conductor collable to extremely low temperature
US5473302A (en) * 1993-04-26 1995-12-05 Top Gulf Coast Corporation Narrow profile transformer having interleaved windings and cooling passage
EP2581135A4 (en) * 2011-08-15 2013-12-04 Shandong Haute Magnet Technology Co Ltd MAGNETIC SEPARATOR WITH A HIGH GRADIENT AND WITH A VERTICAL RING
US20140224711A1 (en) * 2011-08-15 2014-08-14 Shandong Huate Magnet Technology Co., Ltd. Vertical ring high gradient magnetic separator
US9079190B2 (en) * 2011-08-15 2015-07-14 Shandong Huate Magnet Technology Co., Ltd. Vertical ring high gradient magnetic separator
CN108970806A (zh) * 2018-09-20 2018-12-11 鞍钢集团矿业有限公司 一种立环高梯度磁选机励磁线圈结构
CN108970806B (zh) * 2018-09-20 2019-11-05 鞍钢集团矿业有限公司 一种立环高梯度磁选机的励磁线圈结构
DE102021118450A1 (de) 2021-07-16 2023-01-19 Rolls-Royce Deutschland Ltd & Co Kg Spule

Also Published As

Publication number Publication date
SE318944B (enExample) 1969-12-22
CH477802A (de) 1969-08-31
FR1571948A (enExample) 1969-06-20
GB1223636A (en) 1971-03-03

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