EP3189715B1 - Adjustable magnetic multipole - Google Patents

Adjustable magnetic multipole Download PDF

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Publication number
EP3189715B1
EP3189715B1 EP15766410.3A EP15766410A EP3189715B1 EP 3189715 B1 EP3189715 B1 EP 3189715B1 EP 15766410 A EP15766410 A EP 15766410A EP 3189715 B1 EP3189715 B1 EP 3189715B1
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EP
European Patent Office
Prior art keywords
permanent magnet
rotation
peripheral
central point
parts
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EP15766410.3A
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German (de)
French (fr)
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EP3189715A1 (en
Inventor
Chamseddine BENABDERRAHMANE
Marie-Emmanuelle COUPRIE
Frédéric FOREST
Olivier COSSON
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Sigmaphi
Synchrotron Soleil
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Sigmaphi
Synchrotron Soleil
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H7/00—Details of devices of the types covered by groups H05H9/00, H05H11/00, H05H13/00
    • H05H7/04—Magnet systems, e.g. undulators, wigglers; Energisation thereof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/02—Permanent magnets [PM]
    • H01F7/0273—Magnetic circuits with PM for magnetic field generation
    • H01F7/0278—Magnetic circuits with PM for magnetic field generation for generating uniform fields, focusing, deflecting electrically charged particles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/02—Permanent magnets [PM]
    • H01F7/0273—Magnetic circuits with PM for magnetic field generation
    • H01F7/0278—Magnetic circuits with PM for magnetic field generation for generating uniform fields, focusing, deflecting electrically charged particles
    • H01F7/0284—Magnetic circuits with PM for magnetic field generation for generating uniform fields, focusing, deflecting electrically charged particles using a trimmable or adjustable magnetic circuit, e.g. for a symmetric dipole or quadrupole magnetic field
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H7/00—Details of devices of the types covered by groups H05H9/00, H05H11/00, H05H13/00
    • H05H7/04—Magnet systems, e.g. undulators, wigglers; Energisation thereof
    • H05H2007/043—Magnet systems, e.g. undulators, wigglers; Energisation thereof for beam focusing
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H7/00—Details of devices of the types covered by groups H05H9/00, H05H11/00, H05H13/00
    • H05H7/04—Magnet systems, e.g. undulators, wigglers; Energisation thereof
    • H05H2007/046—Magnet systems, e.g. undulators, wigglers; Energisation thereof for beam deflection

Definitions

  • the present invention relates to a magnetic multi-pole. It also relates to a method of adjusting such a multi-pole.
  • Such a device makes it possible, for example, but in a nonlimiting manner, to provide an adjustable magnetic multi-pole with a high magnetic field gradient and high compactness.
  • the field of the invention is preferably, but not limited to, that of magnetic fields for particle accelerator.
  • a plasma laser acceleration system delivers beams with high divergence that must be contained at the output of a generation chamber, requiring the use of a magnetic multi-pole.
  • DiMarco's article describes an adjustable quadrupole. The adjustment is made by several rotating magnets.
  • the object of the present invention is to propose a new multi-pole for solving at least one of these problems.
  • Another object of the present invention is to propose a method for adjusting such a multi-pole.
  • Peripheral permanent magnets are preferably N in number.
  • Each peripheral permanent magnet may be provided with a screen of ferromagnetic material, preferably such that the axis of rotation of each peripheral permanent magnet is located on a segment connecting the screen of this peripheral permanent magnet and the central point.
  • the N permanent magnet parts, the N parts made of ferromagnetic material, and the peripheral permanent magnets are preferably held inside the same support provided, around the central point, with at least one hollow between two of the magnets. permanent devices.
  • N is preferably greater than or equal to 4.
  • the N permanent magnet portions can be grouped together by a pair of permanent magnet parts, each pair of permanent magnet parts preferably comprising two permanent magnet parts located in the plane of section at symmetrical locations. report to the central point.
  • Each pair of permanent magnet portions preferably comprises two permanent magnet portions having opposing magnetizations.
  • the N parts made of ferromagnetic material may be grouped by a pair of ferromagnetic material parts, each pair of ferromagnetic material parts preferably comprising two parts of ferromagnetic material located in the plane of section, at locations symmetrical with respect to the central point.
  • the axes of rotation of the peripheral permanent magnets may be distributed in the plane of section on a circle centered on the central point.
  • a connecting segment in the plane of section, connecting the axis of rotation of this peripheral permanent magnet and the central point can pass through one (preferably a single) of the N parts of ferromagnetic material.
  • the connecting segment of each peripheral permanent magnet preferably passes through a ferromagnetic material part different from the ferromagnetic material parts traversed by the connecting segments of the other peripheral permanent magnets.
  • the N peripheral permanent magnets may be grouped by pairs of peripheral permanent magnets, each pair of peripheral permanent magnets preferably comprising two peripheral permanent magnets located in the plane of section at locations symmetrical with respect to the central point.
  • the rotation of at least one of the peripheral permanent magnets may comprise a rotation of all the peripheral permanent magnets around their axis of rotation, preferably at the same angular value of rotation.
  • Two peripheral permanent magnets of the same pair preferably rotate in the same direction of rotation.
  • variants of the invention comprising only a selection of characteristics described or illustrated subsequently isolated from the other characteristics described or illustrated (even if this selection is isolated within a sentence including these other characteristics), if this selection of features is sufficient to confer a technical advantage or to differentiate the invention from the state of the prior art.
  • This selection comprises at least one preferably functional characteristic without structural details, and / or with only a part of the structural details if this part alone is sufficient to confer a technical advantage or to differentiate the invention from the state of the art. earlier.
  • the description will be made by default in the section plane 14, but the structure of the multi-pole 1 is identical by translation in several (more precisely all) cutting planes parallel to the section plane 14, it is in several (or all) section planes perpendicular to the X axis of the first end 16 to the second end 17 of the multi-pole 1.
  • the first magnetic multi-pole embodiment 1 comprises N permanent magnet portions 2 arranged, according to the section plane 14, around a central point 3.
  • the central point 3 is in the center of a hollow central zone 21.
  • Each permanent magnet part 2 comprises only one single permanent magnet whose magnetization (tangent to a circle centered on the central point 3) is illustrated by an arrow 20, the tip of each arrow 20 indicating the magnetic north pole of this magnet.
  • the magnetization of a permanent magnet is the magnetic moment per unit volume of this magnet.
  • N is an integer positive integer number greater than or equal to 2.
  • N is preferably greater than or equal to 4 (but one could also implement a dipole).
  • N 4, that is to say that the multi-pole 1 is a quadripole.
  • the first embodiment of magnetic multi-pole 1 further comprises N parts (referenced 4 in the figures) made of non-magnetized ferromagnetic material (ie not including a permanent magnet, and preferably no electromagnet either), arranged , according to the sectional plane 14, around the central point 3.
  • N parts referenced 4 in the figures
  • non-magnetized ferromagnetic material ie not including a permanent magnet, and preferably no electromagnet either
  • the permanent magnet parts 2 and the parts made of ferromagnetic material 4 are contained in the section plane 14 in an annular zone 5.
  • the permanent magnet parts 2 and the ferromagnetic material parts 4 do not protrude from the annular zone 5.
  • the annular zone 5 is centered on the central point 3.
  • the annular zone 5 is delimited by two concentric circles 36, 37 (shown in bold dashed lines in the figures), centered on the central point 3.
  • each of the N permanent magnet parts 2 has a surface 22 (at a distance d1 from the central point 3, d1 being identical for all the permanent magnet parts 2) for which none of the N parts made of ferromagnetic material 4 is between this surface 22 and the central point 3.
  • each of the N parts made of ferromagnetic material 4 has a surface 24 (at a distance d2 from the central point 3, d2 being identical for all parts made of ferromagnetic material 4) for which none of the N permanent magnet parts 2 are between this surface 24 and the central point 3.
  • Each permanent magnet part 2 makes it possible to channel the magnetic field and to avoid disturbing the quality of the magnetic field at center 3 of multi-pole 1 and the operation of nearby equipment.
  • the first embodiment of multi-magnetic pole 1 further comprises peripheral permanent magnets 6 adjustment.
  • each peripheral permanent magnet 6 has a cylinder shape extending along the axis X, that is to say perpendicularly to the plane of section 14.
  • Each peripheral permanent magnet 6 is rotatably mounted around an axis of rotation 7 which is specific to it (ie which is different from the axis of rotation of the other peripheral magnets 6).
  • Each axis of rotation 7 is located, in the plane of section 14, beyond the annular zone 5 with respect to the central point 3, that is to say further from the central point 3 than the annular zone 5.
  • the annular zone 5 does not cover (even partially) any of the peripheral permanent magnets 6.
  • Each axis of rotation 7 is perpendicular to the section plane 14.
  • each peripheral permanent magnet 6 (this magnetization being perpendicular to the axis of rotation 7 of this peripheral magnet 6 and being illustrated by an arrow 60, the tip of the arrow 60 illustrating a magnetic north pole of this peripheral magnet 6 ) is contained in the cutting plane 14.
  • each permanent magnet portion 2 (illustrated by an arrow 20, the tip of each arrow 20 illustrating a magnetic north pole of this portion 2) is contained in the plane of section 14.
  • the axes of rotation 7 of the peripheral permanent magnets 6 are distributed, in the plane of section 14, on a circle 12 centered on the central point 3 and surrounding the annular zone 5.
  • Peripheral permanent magnets 6 are N.
  • each peripheral permanent magnet 6 is situated on a segment 9 connecting the screen 8 of this peripheral permanent magnet 6 and the central point 3.
  • the N permanent magnet parts 2, the N ferromagnetic material parts 4, the peripheral permanent magnets 6 and the screens 8 are held inside the same support 10 provided, around the central point 3 along the circle 22, at least one hollow 11 between two of the peripheral permanent magnets 6. This allows the passage of a laser beam 23 to the axis 25 perpendicular to the cutting plane 14 and passing through the central point 3.
  • the support 10 is made of aluminum.
  • the permanent magnet portions 2 are fixed and non-movable with respect to the support 10.
  • Each permanent magnet 6 is free to rotate 360 ° about its axis 7 within the support 10.
  • the parts 2 and 4 are held between the support 10 and a pipe 34.
  • the pipe 34 is located between the parts 2, 4 and the central point 3.
  • the pipe 34 is in contact with each of the parts 2, 4.
  • the pipe 34 is copper. This pipe 34 can convey the image current created by the passage of the electron beam 32 and protects the parts 2 against a risk of overheating.
  • the N permanent magnet parts 2 are grouped together by pairs of permanent magnet parts 2, each pair 2a or 2b of permanent magnet parts 2 comprising two localized permanent magnet parts 2, in the plane of section 14, at symmetrical locations by report to central point 3.
  • Each pair 2a or 2b of permanent magnet parts 2 comprises two permanent magnet parts 2 having magnetizations 20 of opposite directions, and preferably of the same value (with a difference in value of plus or minus 1% with respect to the largest of the two values within the pair, and of the parallel directions at plus or minus 1 °).
  • the N parts of ferromagnetic material 4 are grouped together by a pair of ferromagnetic material parts, each pair 4a or 4b of parts made of ferromagnetic material 4 comprising two parts made of ferromagnetic material 4 located in the plane of section 14 at symmetrical locations relative to at the central point 3.
  • each peripheral permanent magnet 6 passes through a part of ferromagnetic material 4 different from the ferromagnetic material parts 4 traversed by the connecting segments 13, 13b of the other peripheral permanent magnets 6.
  • the N peripheral permanent magnets 6 are grouped together by pairs of peripheral permanent magnets, each pair 6a or 6b of peripheral permanent magnets comprising two peripheral permanent magnets 6 located, in the plane of section, at locations symmetrical with respect to the central point 3 .
  • the parts 2 and 4 of the multi-pole 1 are fixed in the center of the support 10 made of aluminum, itself secured to a box 15 of square shape illustrated on the figure 5 .
  • the multi-pole 1 comprises N motors 26, each motor 26 ensuring the rotational movement of one of the peripheral magnets 6 typically via a belt 27.
  • the housing 15 has openings 28, 29 which allow the passage of different laser beams 23 participating in an experiment without disturbing the operation of the multi-pole 1.
  • the multi-pole 1 is placed on a mechanical support via two micrometric plates 30, 31 which make it possible to adjust the magnetic center 3, 25 of the multi-pole 1 in two directions (horizontal and vertical) with respect to the axis of the beam of electrons 32 which therefore circulates ideally along an axis perpendicular to the plane of section 14 and passing through the central point 3.
  • a control system (not shown) allows to control and control the multi-pole 1 from outside of a vacuum chamber 33.
  • the vacuum chamber 33 is illustrated on the figure 6 .
  • This vacuum chamber may comprise several casings 15 arranged in series (three on the figure 6 ), each housing 15 comprising its multi-pole 1 and being equipped with its plates 30, 31.
  • the length L of the multi-pole is 100 mm along the axis X, that is to say perpendicular to the plane of section 14.
  • the figure 8 indicates several dimensions in millimeters (mm).
  • the multi-pole 1 is an extremely compact magnetic system with a support section 10 of 9x9 cm 2 (in the plane of section 14) and a length (along the axis X, perpendicular to the section plane 14) of 10 cm.
  • the throat circle (diameter of the central zone 21 plus the pipe 34) is 12 mm.
  • At least one of the peripheral permanent magnets 6 is rotated about its axis of rotation 7.
  • Each permanent magnet 6 is free to rotate 360 ° about its axis 7.
  • the rotation of at least one of the peripheral permanent magnets 6 comprises a rotation of all the peripheral permanent magnets 6 about their axis of rotation 7 preferably according to the same angular value of rotation.
  • Two peripheral permanent magnets 6 of the same pair 6a or 6b rotate in the same direction of rotation (clockwise or counterclockwise). Any sequence of two peripheral permanent magnets 6 whose axes of rotation 7 are successive, in the plane of section 14 along a closed loop 12 surrounding the central point 3, rotate in opposite directions of rotation (hourly or counterclockwise) .
  • the rotation of the peripheral magnets 6 makes it possible to add or subtract, to the fixed part of the magnetic field created by the permanent magnet parts 2, a quadrupole component, which makes it possible to vary the quadrupole gradient by approximately 50%.
  • FIG 9 is a sectional view of a second embodiment of multi-pole according to the invention, which will be described only for its differences from the first embodiment of multi-pole according to the invention.
  • each permanent magnet part 2 comprises several permanent magnets (two on the figure 9 ) having different directions of magnetization (all tangent to a circle centered on the central point 3) illustrated by arrows 20a, 20b, the tip of each arrow 20a, 20b indicating the magnetic north pole of each permanent magnet of each part 2 permanent magnet.
  • the figure 10 is a sectional view of a third embodiment of multi-pole according to the invention, which will be described only for its differences with respect to the first embodiment of multi-pole according to the invention.
  • each permanent magnet part 2 comprises several permanent magnets (two on the figure 9 ) having different directions of magnetization (all tangent to a circle centered on the central point 3) illustrated by arrows 20a, 20b, the tip of each arrow 20a, 20b indicating the magnetic north pole of each permanent magnet of each part 2 permanent magnet.
  • each magnet of a fixed part 2 is replaced by two magnets with a different orientation of magnetization.
  • each portion of ferromagnetic material 4 has a cylindrical arc shape further provided with a sharp edge 35 oriented in the direction of the axis 25 and therefore of the central point 3.
  • the shape of the end of the magnetic poles on the throat circle is modified.
  • the gradient of the multi-pole is increased by about 20%.
  • the figure 11 is a sectional view of a fourth embodiment of multi-pole according to the invention (without the support 10 which is not shown to lighten this figure), which will be described only for its differences with respect to the first embodiment of multi-pole according to the invention.
  • each portion of ferromagnetic material 4 does not have a cylindrical arc shape but has a rectangular parallelepiped shape.
  • each permanent magnet part 2 does not have a cylindrical arc shape but has a rectangular parallelepiped shape.
  • the figure 12 is a sectional view of a fifth embodiment of multi-pole according to the invention (without the support 10 which is not shown to lighten this figure), which will be described only for its differences from the first mode multi-pole embodiment according to the invention.
  • N 6, that is to say that the multi-pole 1 is a magnetic sextupole.
  • the figure 13 is a sectional view of a sixth embodiment of multi-pole according to the invention (without the support 10 which is not shown to lighten this figure), which will be described only for its differences from the first mode multi-pole embodiment according to the invention.
  • N 8 that is to say that the multi-pole 1 is a magnetic octopole.

Description

Domaine techniqueTechnical area

La présente invention concerne un multi-pôle magnétique. Elle concerne aussi un procédé de réglage d'un tel multi-pôle.The present invention relates to a magnetic multi-pole. It also relates to a method of adjusting such a multi-pole.

Un tel dispositif permet par exemple, mais de manière non limitative, de fournir un multi-pôle magnétique réglable à fort gradient de champ magnétique et forte compacité. Le domaine de l'invention est de préférence, mais de manière non limitative, celui des champs magnétiques pour accélérateur de particules.Such a device makes it possible, for example, but in a nonlimiting manner, to provide an adjustable magnetic multi-pole with a high magnetic field gradient and high compactness. The field of the invention is preferably, but not limited to, that of magnetic fields for particle accelerator.

Etat de la technique antérieureState of the art

Un système d'accélération par laser plasma délivre des faisceaux à forte divergence qu'il faut contenir à la sortie d'une chambre de génération, nécessitant d'utiliser un multi-pôle magnétique.A plasma laser acceleration system delivers beams with high divergence that must be contained at the output of a generation chamber, requiring the use of a magnetic multi-pole.

On connaît l'article de J. DiMarco et al. (« Adjustable Permanent Quadrupoles Using Rotating Magnet Material Rods for the next Linear Collider », IEE transactions on Applied Superconductivity, vol12, N°1, Mars 2002 ), qui date d'il y a plus de dix ans.We know the article of J. DiMarco et al. ("Adjustable Permanent Quadrupoles Using Rotating Magnet Material Rods for the next Linear Collider", IEE Transactions on Applied Superconductivity, vol12, No. 1, March 2002 ), which is more than ten years old.

L'article de DiMarco décrit un quadripôle réglable. Le réglage se fait par plusieurs aimants rotatifs.DiMarco's article describes an adjustable quadrupole. The adjustment is made by several rotating magnets.

Certains problèmes posés par ce type de quadripôle sont les suivants :

  • augmenter la variabilité du champ magnétique
  • augmenter le gradient maximum du champ magnétique
  • rendre le multi-pôle encore plus compact
  • rendre la structure du multi-pôle compatible avec son utilisation au sein d'un système d'accélération d'électrons par laser plasma, i.e. par exemple avec les aménagements pour l'arrivée de faisceaux laser ou de particules vers ce multi-pôle malgré l'encombrement de toutes les pièces de ce multi-pôle.
Some problems with this type of quadrupole are:
  • increase the variability of the magnetic field
  • increase the maximum gradient of the magnetic field
  • make the multi-pole even more compact
  • to make the structure of the multi-pole compatible with its use within a plasma laser electron acceleration system, ie for example with the arrangements for the arrival of laser beams or particles towards this multi-pole despite the 'congestion of all parts of this multi-pole.

Le but de la présente invention est de proposer un nouveau multi-pôle permettant de résoudre au moins un de ces problèmes.The object of the present invention is to propose a new multi-pole for solving at least one of these problems.

Un autre but de la présente invention est de proposer un procédé de réglage d'un tel multi-pôle.Another object of the present invention is to propose a method for adjusting such a multi-pole.

Exposé de l'inventionPresentation of the invention

Cet objectif est atteint avec un multi-pôle magnétique, comprenant :

  • N parties en aimant permanent disposées, selon un plan de coupe, autour d'un point central, N étant un nombre entier positif supérieur ou égal à 2,
  • N parties en matière ferromagnétique, disposées, selon le plan de coupe, autour du point central, les parties en aimant permanent et les parties en matière ferromagnétique étant contenues dans le plan de coupe dans une zone annulaire autour du point central en étant réparties de manière alternée dans la zone annulaire,
  • des aimants permanents périphériques, chaque aimant permanent périphérique étant monté en rotation autour d'un axe de rotation qui lui est propre, qui est situé au-delà de la zone annulaire par rapport au point central et qui est de préférence perpendiculaire au plan de coupe.
This objective is achieved with a magnetic multi-pole, comprising:
  • N permanent magnet portions disposed in a sectional plane around a central point, N being a positive integer greater than or equal to 2,
  • N parts of ferromagnetic material disposed in the plane of section around the central point, the permanent magnet parts and the ferromagnetic material parts being contained in the cutting plane in an annular zone around the central point and distributed in such a manner as to be alternated in the annular zone,
  • peripheral permanent magnets, each peripheral permanent magnet being rotatably mounted about an axis of rotation proper to it, which is located beyond the annular zone with respect to the central point and which is preferably perpendicular to the plane of section .

Les aimants permanents périphériques sont de préférence au nombre de N.Peripheral permanent magnets are preferably N in number.

Chaque aimant permanent périphérique peut être muni d'un écran en matière ferromagnétique, de préférence de sorte que l'axe de rotation de chaque aimant permanent périphérique soit situé sur un segment reliant l'écran de cet aimant permanent périphérique et le point central.Each peripheral permanent magnet may be provided with a screen of ferromagnetic material, preferably such that the axis of rotation of each peripheral permanent magnet is located on a segment connecting the screen of this peripheral permanent magnet and the central point.

Les N parties en aimant permanent, les N parties en matière ferromagnétique, et les aimants permanents périphériques, sont de préférence maintenus à l'intérieur d'un même support muni, autour du point central, d'au moins un creux entre deux des aimants permanents périphériques.The N permanent magnet parts, the N parts made of ferromagnetic material, and the peripheral permanent magnets are preferably held inside the same support provided, around the central point, with at least one hollow between two of the magnets. permanent devices.

N est de préférence supérieur ou égal à 4.N is preferably greater than or equal to 4.

Les N parties en aimant permanent peuvent être regroupées par couple de parties en aimant permanent, chaque couple de parties en aimant permanent comprenant de préférence deux parties en aimant permanent localisées, dans le plan de coupe, à des emplacements symétriques par rapport au point central. Chaque couple de parties en aimant permanent comprend de préférence deux parties en aimant permanent ayant des aimantations de sens opposés.The N permanent magnet portions can be grouped together by a pair of permanent magnet parts, each pair of permanent magnet parts preferably comprising two permanent magnet parts located in the plane of section at symmetrical locations. report to the central point. Each pair of permanent magnet portions preferably comprises two permanent magnet portions having opposing magnetizations.

Les N parties en matière ferromagnétique peuvent être regroupées par couple de parties en matière ferromagnétique, chaque couple de parties en matière ferromagnétique comprenant de préférence deux parties en matière ferromagnétique localisées, dans le plan de coupe, à des emplacements symétriques par rapport au point central.The N parts made of ferromagnetic material may be grouped by a pair of ferromagnetic material parts, each pair of ferromagnetic material parts preferably comprising two parts of ferromagnetic material located in the plane of section, at locations symmetrical with respect to the central point.

Les axes de rotation des aimants permanents périphériques peuvent être répartis, dans le plan de coupe, sur un cercle centré sur le point central.The axes of rotation of the peripheral permanent magnets may be distributed in the plane of section on a circle centered on the central point.

Pour chaque aimant permanent périphérique, un segment de liaison, dans le plan de coupe, reliant l'axe de rotation de cet aimant permanent périphérique et le point central peut traverser une (de préférence une unique) des N parties en matière ferromagnétique. Le segment de liaison de chaque aimant permanent périphérique traverse de préférence une partie en matière ferromagnétique différente des parties en matière ferromagnétique traversées par les segments de liaison des autres aimants permanents périphériques.For each peripheral permanent magnet, a connecting segment, in the plane of section, connecting the axis of rotation of this peripheral permanent magnet and the central point can pass through one (preferably a single) of the N parts of ferromagnetic material. The connecting segment of each peripheral permanent magnet preferably passes through a ferromagnetic material part different from the ferromagnetic material parts traversed by the connecting segments of the other peripheral permanent magnets.

Les N aimants permanents périphériques peuvent être regroupés par couple d'aimants permanents périphériques, chaque couple d'aimants permanents périphériques comprenant de préférence deux aimants permanents périphériques localisés, dans le plan de coupe, à des emplacements symétriques par rapport au point central.The N peripheral permanent magnets may be grouped by pairs of peripheral permanent magnets, each pair of peripheral permanent magnets preferably comprising two peripheral permanent magnets located in the plane of section at locations symmetrical with respect to the central point.

Suivant encore un autre aspect de l'invention, il est proposé un procédé de réglage d'un multi-pôle magnétique selon l'une quelconque des revendications précédentes, comprenant une rotation d'au moins un des aimants permanents périphériques autour de son axe de rotation.According to yet another aspect of the invention, there is provided a method of adjusting a magnetic multi-pole according to any one of the preceding claims, comprising rotating at least one of the peripheral permanent magnets around its axis of rotation. rotation.

La rotation d'au moins un des aimants permanents périphériques peut comprendre une rotation de tous les aimants permanents périphériques autour de leur axe de rotation, de préférence selon une même valeur angulaire de rotation.The rotation of at least one of the peripheral permanent magnets may comprise a rotation of all the peripheral permanent magnets around their axis of rotation, preferably at the same angular value of rotation.

Deux aimants permanents périphériques d'un même couple tournent de préférence dans un même sens de rotation.Two peripheral permanent magnets of the same pair preferably rotate in the same direction of rotation.

Toute suite de deux aimants permanents périphériques dont les axes de rotation sont successifs, dans le plan de coupe le long d'une boucle fermée entourant le point central, tournent de préférence dans des sens de rotation opposés.Any sequence of two peripheral permanent magnets whose axes of rotation are successive, in the plane of section along a closed loop surrounding the central point, preferably rotate in opposite directions of rotation.

Description des figures et modes de réalisationDescription of the Figures and Embodiments

D'autres avantages et particularités de l'invention apparaîtront à la lecture de la description détaillée de mises en oeuvre et de modes de réalisation nullement limitatifs, et des dessins annexés suivants :

  • la figure 1 est une vue en perspective d'un premier mode de réalisation de multi-pôle selon l'invention, qui est le mode de réalisation préféré de l'invention,
  • les figures 2 à 4 sont des vues de coupe (selon le plan de coupe 14 de la figure 1) du premier mode de réalisation de multi-pôle selon l'invention,
  • la figure 5 est une vue en perspective du boitier 15 comprenant le premier mode de réalisation de multi-pôle selon l'invention,
  • la figure 6 est une vue en perspective de trois boitiers 15 identiques (tels que représentés sur la figure 5) disposés en série au sein d'une chambre à vide 33,
  • la figure 7 illustre une partie 19 de la figure 5,
  • la figure 8 est une vue de face du premier mode de réalisation de multi-pôle selon l'invention sur laquelle on voit la première extrémité 16 du multi-pôle ; sur cette figure est en outre indiqué l'emplacement 18 d'arrivé d'un laser sur un plan portant la première extrémité 16,
  • la figure 9 est une vue de coupe d'un deuxième mode de réalisation de multi-pôle selon l'invention,
  • la figure 10 est une vue de coupe d'un troisième mode de réalisation de multi-pôle selon l'invention,
  • la figure 11 est une vue de coupe d'un quatrième mode de réalisation de multi-pôle selon l'invention,
  • la figure 12 est une vue de coupe d'un cinquième mode de réalisation de multi-pôle selon l'invention, et
  • la figure 13 est une vue de coupe d'un sixième mode de réalisation de multi-pôle selon l'invention.
Other advantages and particularities of the invention will appear on reading the detailed description of implementations and non-limiting embodiments, and the following appended drawings:
  • the figure 1 is a perspective view of a first multi-pole embodiment according to the invention, which is the preferred embodiment of the invention,
  • the Figures 2 to 4 are sectional views (according to section plane 14 of the figure 1 ) of the first embodiment of multi-pole according to the invention,
  • the figure 5 is a perspective view of the housing 15 comprising the first embodiment of multi-pole according to the invention,
  • the figure 6 is a perspective view of three identical boxes (as shown in FIG. figure 5 ) arranged in series within a vacuum chamber 33,
  • the figure 7 illustrates part 19 of the figure 5 ,
  • the figure 8 is a front view of the first embodiment of multi-pole according to the invention on which we see the first end 16 of the multi-pole; in this figure is further indicated the location 18 of arrival of a laser on a plane carrying the first end 16,
  • the figure 9 is a sectional view of a second embodiment of multi-pole according to the invention,
  • the figure 10 is a sectional view of a third embodiment of multi-pole according to the invention,
  • the figure 11 is a sectional view of a fourth embodiment of multi-pole according to the invention,
  • the figure 12 is a sectional view of a fifth embodiment of multi-pole according to the invention, and
  • the figure 13 is a sectional view of a sixth embodiment of multi-pole according to the invention.

Ces modes de réalisation étant nullement limitatifs, on pourra notamment considérer des variantes de l'invention ne comprenant qu'une sélection de caractéristiques décrites ou illustrées par la suite isolées des autres caractéristiques décrites ou illustrées (même si cette sélection est isolée au sein d'une phrase comprenant ces autres caractéristiques), si cette sélection de caractéristiques est suffisante pour conférer un avantage technique ou pour différencier l'invention par rapport à l'état de la technique antérieure. Cette sélection comprend au moins une caractéristique de préférence fonctionnelle sans détails structurels, et/ou avec seulement une partie des détails structurels si cette partie uniquement est suffisante pour conférer un avantage technique ou à différencier l'invention par rapport à l'état de la technique antérieure.These embodiments being in no way limiting, it will be possible to consider variants of the invention comprising only a selection of characteristics described or illustrated subsequently isolated from the other characteristics described or illustrated (even if this selection is isolated within a sentence including these other characteristics), if this selection of features is sufficient to confer a technical advantage or to differentiate the invention from the state of the prior art. This selection comprises at least one preferably functional characteristic without structural details, and / or with only a part of the structural details if this part alone is sufficient to confer a technical advantage or to differentiate the invention from the state of the art. earlier.

On va tout d'abord décrire, en référence aux figures 1 à 8, un premier mode de réalisation de dispositif 1 selon l'invention.We will first describe, with reference to Figures 1 to 8 , a first embodiment of device 1 according to the invention.

Par la suite, la description sera effectuée par défaut dans le plan de coupe 14, mais la structure du multi-pôle 1 est identique par translation dans plusieurs (plus précisément tous les) plans de coupe parallèles au plan de coupe 14, c'est-à-dire dans plusieurs (ou tous) les plans de coupe perpendiculaire à l'axe X de la première extrémité 16 à la deuxième extrémité 17 du multi-pôle 1.Subsequently, the description will be made by default in the section plane 14, but the structure of the multi-pole 1 is identical by translation in several (more precisely all) cutting planes parallel to the section plane 14, it is in several (or all) section planes perpendicular to the X axis of the first end 16 to the second end 17 of the multi-pole 1.

Le premier mode de réalisation de multi-pôle magnétique 1, comprend N parties 2 en aimant permanent disposées, selon le plan de coupe 14, autour d'un point central 3.The first magnetic multi-pole embodiment 1 comprises N permanent magnet portions 2 arranged, according to the section plane 14, around a central point 3.

Le point central 3 est au centre d'une zone centrale 21 creuse.The central point 3 is in the center of a hollow central zone 21.

Chaque partie 2 en aimant permanent ne comprend qu'un seul et unique aimant permanent dont l'aimantation (tangente à un cercle centré sur le point central 3) est illustrée par une flèche 20, la pointe de chaque flèche 20 indiquant le pôle nord magnétique de cet aimant.Each permanent magnet part 2 comprises only one single permanent magnet whose magnetization (tangent to a circle centered on the central point 3) is illustrated by an arrow 20, the tip of each arrow 20 indicating the magnetic north pole of this magnet.

L'aimantation d'un aimant permanent est le moment magnétique par unité de volume de cet aimant.The magnetization of a permanent magnet is the magnetic moment per unit volume of this magnet.

N est un nombre pair entier positif supérieur ou égal à 2.N is an integer positive integer number greater than or equal to 2.

N est de préférence supérieur ou égal à 4 (mais on pourrait aussi implémenter un dipôle).N is preferably greater than or equal to 4 (but one could also implement a dipole).

Dans ce premier mode de réalisation, N=4, c'est-à-dire que le multi-pôle 1 est un quadripôle.In this first embodiment, N = 4, that is to say that the multi-pole 1 is a quadripole.

Chaque partie en aimant permanent 2 est en Néodyme - fer - bore (NdFeB) (rémanence Br=1,26 T et coercivité Hcj=1355kA/m)Each permanent magnet part 2 is in neodymium - iron - boron (NdFeB) (remanence B r = 1.26 T and coercivity H cj = 1355kA / m)

Le premier mode de réalisation de multi-pôle magnétique 1 comprend en outre N parties (référencées 4 sur les figures) en matière ferromagnétique non aimantée (i.e. ne comprenant pas d'aimant permanent, et de préférence pas d'électroaimant non plus), disposées, selon le plan de coupe 14, autour du point central 3.The first embodiment of magnetic multi-pole 1 further comprises N parts (referenced 4 in the figures) made of non-magnetized ferromagnetic material (ie not including a permanent magnet, and preferably no electromagnet either), arranged , according to the sectional plane 14, around the central point 3.

Chaque partie en matière ferromagnétique 4 est en acier magnétique (Vanadium Permendur, saturation Bs=2,35 T).Each part of ferromagnetic material 4 is made of magnetic steel (Vanadium Permendur, saturation B s = 2.35 T).

Les parties en aimant permanent 2 et les parties en matière ferromagnétique 4 sont contenues dans le plan de coupe 14 dans une zone annulaire 5. Les parties en aimant permanent 2 et les parties en matière ferromagnétique 4 ne dépassent pas de la zone annulaire 5.The permanent magnet parts 2 and the parts made of ferromagnetic material 4 are contained in the section plane 14 in an annular zone 5. The permanent magnet parts 2 and the ferromagnetic material parts 4 do not protrude from the annular zone 5.

La zone annulaire 5 est centrée sur le point central 3.The annular zone 5 is centered on the central point 3.

La zone annulaire 5 est délimitée par deux cercles concentriques 36, 37 (représentes en pointillés gras sur les figures), centrés sur le point central 3.The annular zone 5 is delimited by two concentric circles 36, 37 (shown in bold dashed lines in the figures), centered on the central point 3.

Les parties en aimant permanent 2 et les parties en matière ferromagnétique 4 sont disposées, dans le plan de coupe 14, autour du point central 3 (dans la zone annulaire 5) en étant réparties de manière alternée dans la zone annulaire 5. Chaque partie en aimant permanent 2 est, en parcourant un cercle centré sur le point 3 et contenu dans la zone annulaire 5 :

  • précédée et en contact (sur toute une surface de contact) d'une partie en matière ferromagnétique 4, et
  • suivie et en contact (sur toute une surface de contact) d'une autre partie en matière ferromagnétique 4.
The permanent magnet parts 2 and the parts made of ferromagnetic material 4 are arranged in the plane of section 14 around the central point 3 (in the annular zone 5) and are alternately distributed in the annular zone 5. Each part of permanent magnet 2 is, by traversing a circle centered on the point 3 and contained in the annular zone 5:
  • preceded and in contact (over an entire contact surface) with a portion of ferromagnetic material 4, and
  • followed and in contact (over a whole contact surface) with another part made of ferromagnetic material 4.

Chaque partie en matière ferromagnétique 4 est, en parcourant un cercle centré sur le point 3 et contenu dans la zone annulaire 5 :

  • précédée et en contact (sur toute une surface de contact) d'une partie en aimant permanent 2, et
  • suivie et en contact (sur toute une surface de contact) d'une autre partie en aimant permanent 2.
Each part made of ferromagnetic material 4 is, by traversing a circle centered on the point 3 and contained in the annular zone 5:
  • preceded and in contact (over an entire contact surface) with a permanent magnet portion 2, and
  • followed and in contact (over a whole contact surface) with another permanent magnet part 2.

En parcourant un cercle centré sur le point 3 et contenu dans la zone annulaire 5, les parties en matière ferromagnétique 4 sont réparties de manière périodique sur ce cercle.By traversing a circle centered on the point 3 and contained in the annular zone 5, the parts of ferromagnetic material 4 are distributed periodically on this circle.

En parcourant un cercle centré sur le point 3 et contenu dans la zone annulaire 5, les parties en aimant permanent 2 sont réparties de manière périodique sur ce cercle.By traversing a circle centered on the point 3 and contained in the annular zone 5, the permanent magnet parts 2 are distributed periodically on this circle.

En référence à la figure 3, chacune des N parties en aimant permanent 2 présente une surface 22 (à une distance d1 du point central 3, d1 étant identique pour toutes les parties en aimant permanent 2) pour laquelle aucune des N parties en matière ferromagnétique 4 n'est comprise entre cette surface 22 et le point central 3.With reference to the figure 3 each of the N permanent magnet parts 2 has a surface 22 (at a distance d1 from the central point 3, d1 being identical for all the permanent magnet parts 2) for which none of the N parts made of ferromagnetic material 4 is between this surface 22 and the central point 3.

En référence à la figure 3, chacune des N parties en matière ferromagnétique 4 présente une surface 24 (à une distance d2 du point central 3, d2 étant identique pour toutes les parties en matière ferromagnétique 4) pour laquelle aucune des N parties en aimant permanent 2 n'est comprise entre cette surface 24 et le point central 3.With reference to the figure 3 , each of the N parts made of ferromagnetic material 4 has a surface 24 (at a distance d2 from the central point 3, d2 being identical for all parts made of ferromagnetic material 4) for which none of the N permanent magnet parts 2 are between this surface 24 and the central point 3.

On a : d1 = d2We have: d1 = d2

L'ensemble des parties 2 et 4 (ou plus précisément des surfaces 22 et 24) assemblées forme une surface entourant le point central 3.All the parts 2 and 4 (or more precisely surfaces 22 and 24) assembled form a surface surrounding the central point 3.

En référence à la figure 1, chaque partie en aimant permanent 2 a une forme d'arc cylindrique:

  • centré sur l'axe 25 passant par le point central 3 et perpendiculaire au plan de coupe 14, et
  • s'étirant le long de l'axe X, c'est-à-dire perpendiculairement au plan 14.
With reference to the figure 1 each permanent magnet portion 2 has a cylindrical arc shape:
  • centered on the axis 25 passing through the central point 3 and perpendicular to the section plane 14, and
  • stretching along the X axis, that is to say perpendicular to the plane 14.

Chaque partie en aimant permanent 2 permet de canaliser le champ magnétique et d'éviter de perturber la qualité du champ magnétique au centre 3 du multi-pôle 1 ainsi que le fonctionnement des équipements proches.Each permanent magnet part 2 makes it possible to channel the magnetic field and to avoid disturbing the quality of the magnetic field at center 3 of multi-pole 1 and the operation of nearby equipment.

En référence à la figure 1, chaque partie en matière ferromagnétique 4 a une forme d'arc cylindrique :

  • centré sur l'axe 25 passant par le point central 3 et perpendiculaire au plan de coupe 14, et
  • s'étirant le long de l'axe X, c'est-à-dire perpendiculairement au plan 14.
With reference to the figure 1 each part of ferromagnetic material 4 has a cylindrical arc shape:
  • centered on the axis 25 passing through the central point 3 and perpendicular to the section plane 14, and
  • stretching along the X axis, that is to say perpendicular to the plane 14.

Le premier mode de réalisation de multi-pôle magnétique 1 comprend en outre des aimants permanents périphériques 6 de réglage.The first embodiment of multi-magnetic pole 1 further comprises peripheral permanent magnets 6 adjustment.

En référence à la figure 1, chaque aimant permanent périphérique 6 a une forme de cylindre s'étirant le long de l'axe X, c'est-à-dire perpendiculairement au plan de coupe 14.With reference to the figure 1 each peripheral permanent magnet 6 has a cylinder shape extending along the axis X, that is to say perpendicularly to the plane of section 14.

Chaque aimant périphérique 6 est en Néodyme - fer - bore (NdFeB) (Br=1,26 T Hcj=1355kA/m)
Chaque aimant permanent périphérique 6 est monté en rotation autour d'un axe de rotation 7 qui lui est propre (i.e. qui est différent de l'axe de rotation des autres aimants périphériques 6).Each peripheral magnet 6 is made of neodymium - iron - boron (NdFeB) (B r = 1.26 TH cj = 1355kA / m)
Each peripheral permanent magnet 6 is rotatably mounted around an axis of rotation 7 which is specific to it (ie which is different from the axis of rotation of the other peripheral magnets 6).

Chaque axe de rotation 7 est situé, dans le plan de coupe 14, au-delà de la zone annulaire 5 par rapport au point central 3, c'est-à-dire plus loin du point central 3 que la zone annulaire 5.Each axis of rotation 7 is located, in the plane of section 14, beyond the annular zone 5 with respect to the central point 3, that is to say further from the central point 3 than the annular zone 5.

La zone annulaire 5 ne couvre (même partiellement) aucun des aimants permanents périphériques 6.The annular zone 5 does not cover (even partially) any of the peripheral permanent magnets 6.

Chaque axe de rotation 7 est perpendiculaire au plan de coupe 14.Each axis of rotation 7 is perpendicular to the section plane 14.

L'aimantation de chaque aimant permanent périphérique 6 (cette aimantation étant perpendiculaire à l'axe de rotation 7 de cet aimant périphérique 6 et étant illustrée par une flèche 60, la pointe de la flèche 60 illustrant un pôle nord magnétique de cet aimant périphérique 6) est contenue dans le plan de coupe 14.The magnetization of each peripheral permanent magnet 6 (this magnetization being perpendicular to the axis of rotation 7 of this peripheral magnet 6 and being illustrated by an arrow 60, the tip of the arrow 60 illustrating a magnetic north pole of this peripheral magnet 6 ) is contained in the cutting plane 14.

L'aimantation de chaque partie en aimant permanent 2 (illustrée par une flèche 20, la pointe de chaque flèche 20 illustrant un pôle nord magnétique de cette partie 2) est contenue dans le plan de coupe 14.The magnetization of each permanent magnet portion 2 (illustrated by an arrow 20, the tip of each arrow 20 illustrating a magnetic north pole of this portion 2) is contained in the plane of section 14.

Les axes de rotation 7 des aimants permanents périphériques 6 sont répartis, dans le plan de coupe 14, sur un cercle 12 centré sur le point central 3 et entourant la zone annulaire 5.The axes of rotation 7 of the peripheral permanent magnets 6 are distributed, in the plane of section 14, on a circle 12 centered on the central point 3 and surrounding the annular zone 5.

Les aimants permanents périphériques 6 sont au nombre de N.Peripheral permanent magnets 6 are N.

La zone annulaire 5 est une zone intermédiaire, comprise entre :

  • le point central 3 (ainsi que la zone central creuse 21) et
  • les aimants périphériques 6
The annular zone 5 is an intermediate zone, between:
  • the central point 3 (as well as the central hollow zone 21) and
  • the peripheral magnets 6

Chaque aimant permanent périphérique 6 est muni d'un écran 8 en matière ferromagnétique non aimantée (i.e. ne comprenant pas d'aimant permanent, et de préférence pas d'électroaimant non plus), typiquement en acier magnétique (Vanadium Permendur, saturation Bs=2,35 T).Each peripheral permanent magnet 6 is provided with a screen 8 made of non-magnetized ferromagnetic material (ie not including a permanent magnet, and preferably no electromagnet either), typically magnetic steel (Vanadium Permendur, saturation B s = 2.35 T).

En référence à la figure 2, dans le plan de coupe 14, l'axe de rotation 7 de chaque aimant permanent périphérique 6 est situé sur un segment 9 reliant l'écran 8 de cet aimant permanent périphérique 6 et le point central 3.With reference to the figure 2 in the plane of section 14, the axis of rotation 7 of each peripheral permanent magnet 6 is situated on a segment 9 connecting the screen 8 of this peripheral permanent magnet 6 and the central point 3.

En référence à la figure 1, chaque écran 8 a une forme d'arc cylindrique :

  • centré sur l'axe 25 passant par le point central 3 et perpendiculaire au plan de coupe 14, et
  • s'étirant le long de l'axe X, c'est-à-dire perpendiculairement au plan 14.
With reference to the figure 1 each screen 8 has a cylindrical arc shape:
  • centered on the axis 25 passing through the central point 3 and perpendicular to the section plane 14, and
  • stretching along the X axis, that is to say perpendicular to the plane 14.

Les N parties en aimant permanent 2, les N parties en matière ferromagnétique 4, les aimants permanents périphériques 6 et les écrans 8 sont maintenus à l'intérieur d'un même support 10 muni, autour du point central 3 le long du cercle 22, d'au moins un creux 11 entre deux des aimants permanents périphériques 6. Cela permet le passage d'un faisceau laser 23 jusqu'à l'axe 25 perpendiculaire au plan de coupe 14 et passant par le point central 3.The N permanent magnet parts 2, the N ferromagnetic material parts 4, the peripheral permanent magnets 6 and the screens 8 are held inside the same support 10 provided, around the central point 3 along the circle 22, at least one hollow 11 between two of the peripheral permanent magnets 6. This allows the passage of a laser beam 23 to the axis 25 perpendicular to the cutting plane 14 and passing through the central point 3.

Le support 10 est en aluminium.The support 10 is made of aluminum.

Les parties en aimant permanent 2 sont fixes et non mobiles par rapport au support 10.The permanent magnet portions 2 are fixed and non-movable with respect to the support 10.

Chaque aimant permanent 6 est libre en rotation à 360° autour de son axe 7 au sein du support 10.Each permanent magnet 6 is free to rotate 360 ° about its axis 7 within the support 10.

En référence à la figure 1, les parties 2 et 4 sont maintenues entre le support 10 et un tuyau 34. Le tuyau 34 est situé entre les parties 2, 4 et le point central 3. Le tuyau 34 est en contact de chacune des parties 2, 4. Le tuyau 34 est en cuivre. Ce tuyau 34 permet de véhiculer le courant image créé par le passage du faisceau d'électron 32 et protège les parties 2 contre un risque d'échauffement.With reference to the figure 1 , the parts 2 and 4 are held between the support 10 and a pipe 34. The pipe 34 is located between the parts 2, 4 and the central point 3. The pipe 34 is in contact with each of the parts 2, 4. The pipe 34 is copper. This pipe 34 can convey the image current created by the passage of the electron beam 32 and protects the parts 2 against a risk of overheating.

Les N parties en aimant permanent 2 sont regroupées par couple de parties en aimant permanent 2, chaque couple 2a ou 2b de parties en aimant permanent 2 comprenant deux parties en aimant permanent 2 localisées, dans le plan de coupe 14, à des emplacements symétriques par rapport au point central 3.The N permanent magnet parts 2 are grouped together by pairs of permanent magnet parts 2, each pair 2a or 2b of permanent magnet parts 2 comprising two localized permanent magnet parts 2, in the plane of section 14, at symmetrical locations by report to central point 3.

Chaque couple 2a ou 2b de parties en aimant permanent 2 comprend deux parties en aimant permanent 2 ayant des aimantations 20 de sens opposés, et de préférence de même valeur (avec un écart de valeur de plus ou moins 1% par rapport à la plus grande des deux valeurs au sein du couple, et des sens parallèles à plus ou moins 1°).Each pair 2a or 2b of permanent magnet parts 2 comprises two permanent magnet parts 2 having magnetizations 20 of opposite directions, and preferably of the same value (with a difference in value of plus or minus 1% with respect to the largest of the two values within the pair, and of the parallel directions at plus or minus 1 °).

Les N parties en matière ferromagnétique 4 sont regroupées par couple de parties en matière ferromagnétique, chaque couple 4a ou 4b de parties en matière ferromagnétique 4 comprenant deux parties en matière ferromagnétique 4 localisées, dans le plan de coupe 14, à des emplacements symétriques par rapport au point central 3.The N parts of ferromagnetic material 4 are grouped together by a pair of ferromagnetic material parts, each pair 4a or 4b of parts made of ferromagnetic material 4 comprising two parts made of ferromagnetic material 4 located in the plane of section 14 at symmetrical locations relative to at the central point 3.

Dans le plan de coupe 14, pour chaque aimant permanent périphérique 6, un segment de liaison 13 reliant l'axe de rotation 7 de cet aimant permanent périphérique 6 et le point central 3 traverse une et une seule des N parties en matière ferromagnétique 4.In the plane of section 14, for each peripheral permanent magnet 6, a connecting segment 13 connecting the axis of rotation 7 of this peripheral permanent magnet 6 and the central point 3 passes through one and only one of the N parts of ferromagnetic material 4.

Le segment de liaison 13, 13a de chaque aimant permanent périphérique 6 traverse une partie en matière ferromagnétique 4 différente des parties en matière ferromagnétique 4 traversées par les segments de liaison 13, 13b des autres aimants permanents périphériques 6.The connecting segment 13, 13a of each peripheral permanent magnet 6 passes through a part of ferromagnetic material 4 different from the ferromagnetic material parts 4 traversed by the connecting segments 13, 13b of the other peripheral permanent magnets 6.

Les N aimants permanents périphériques 6 sont regroupés par couple d'aimants permanents périphériques, chaque couple 6a ou 6b d'aimants permanents périphériques comprenant deux aimants permanents périphériques 6 localisés, dans le plan de coupe, à des emplacements symétriques par rapport au point central 3.The N peripheral permanent magnets 6 are grouped together by pairs of peripheral permanent magnets, each pair 6a or 6b of peripheral permanent magnets comprising two peripheral permanent magnets 6 located, in the plane of section, at locations symmetrical with respect to the central point 3 .

Les parties 2 et 4 du multi-pôle 1 sont fixées au centre du support 10 en aluminium, lui-même solidaire d'un boitier 15 de forme carrée illustré sur la figure 5.The parts 2 and 4 of the multi-pole 1 are fixed in the center of the support 10 made of aluminum, itself secured to a box 15 of square shape illustrated on the figure 5 .

Le multi-pôle 1 comprend N moteurs 26, chaque moteur 26 assurant le mouvement de rotation d'un des aimants périphériques 6 typiquement via une courroie 27.The multi-pole 1 comprises N motors 26, each motor 26 ensuring the rotational movement of one of the peripheral magnets 6 typically via a belt 27.

Quatre moteurs 26 sont fixés aux quatre coins de ce boitier 15.Four motors 26 are fixed to the four corners of this housing 15.

Le boitier 15 dispose d'ouvertures 28, 29 qui permettent le passage de différents rayons lasers 23 participant à une expérience sans perturber le fonctionnement du multi-pôle 1.The housing 15 has openings 28, 29 which allow the passage of different laser beams 23 participating in an experiment without disturbing the operation of the multi-pole 1.

Le multi-pôle 1 est posé sur un support mécanique via deux platines micrométriques 30, 31 qui permettent d'ajuster le centre magnétique 3, 25 du multi-pôle 1 dans deux directions (horizontale et verticale) par rapport à l'axe du faisceau d'électrons 32 qui circule donc idéalement le long d'un axe perpendiculaire au plan de coupe 14 et passant par le point central 3. Un système de contrôle (non illustré) permet de piloter et commander le multi-pôle 1 de l'extérieur d'une chambre à vide 33.The multi-pole 1 is placed on a mechanical support via two micrometric plates 30, 31 which make it possible to adjust the magnetic center 3, 25 of the multi-pole 1 in two directions (horizontal and vertical) with respect to the axis of the beam of electrons 32 which therefore circulates ideally along an axis perpendicular to the plane of section 14 and passing through the central point 3. A control system (not shown) allows to control and control the multi-pole 1 from outside of a vacuum chamber 33.

La chambre à vide 33 est illustrée sur la figure 6. Cette chambre à vide peut comprendre plusieurs boitiers 15 disposés en série (trois sur la figure 6), chaque boitier 15 comprenant son multi-pôle 1 et étant équipé de ses platines 30, 31.The vacuum chamber 33 is illustrated on the figure 6 . This vacuum chamber may comprise several casings 15 arranged in series (three on the figure 6 ), each housing 15 comprising its multi-pole 1 and being equipped with its plates 30, 31.

En référence à la figure 1, la longueur L du multi-pôle est de 100 mm le long de l'axe X, c'est-à-dire perpendiculairement au plan de coupe 14.With reference to the figure 1 , the length L of the multi-pole is 100 mm along the axis X, that is to say perpendicular to the plane of section 14.

La figure 8 indique plusieurs dimensions en millimètres (mm).The figure 8 indicates several dimensions in millimeters (mm).

Le multi-pôle 1 est un système magnétique extrêmement compact avec une section du support 10 de 9x9 cm2 (dans le plan de coupe 14) et une longueur (le long de l'axe X, perpendiculairement au plan de coupe 14) de 10 cm.The multi-pole 1 is an extremely compact magnetic system with a support section 10 of 9x9 cm 2 (in the plane of section 14) and a length (along the axis X, perpendicular to the section plane 14) of 10 cm.

Le cercle de gorge (diamètre de la zone centrale 21 plus du tuyau 34) est de 12 mm.The throat circle (diameter of the central zone 21 plus the pipe 34) is 12 mm.

Avec cette structure, on obtient un maximum local du gradient du champ magnétique très légèrement supérieur à 200 T/m et cette structure permet une variabilité de ce gradient (par rotation des aimants périphériques 6) supérieur à 40%, c'est-à-dire un gradient du champ magnétique approximativement compris entre 100 T/m et 200 T/m selon les positions angulaires des aimants périphériques 6.With this structure, a local maximum of the gradient of the magnetic field very slightly greater than 200 T / m is obtained and this structure allows a variability of this gradient (by rotation of the peripheral magnets 6) greater than 40%, that is to say say a gradient of the field magnet approximately between 100 T / m and 200 T / m depending on the angular positions of the peripheral magnets 6.

Pour régler le multi-pôle magnétique 1, on procède de la manière suivante.To adjust the magnetic multi-pole 1, the procedure is as follows.

On réalise une rotation d'au moins un des aimants permanents périphériques 6 autour de son axe de rotation 7.At least one of the peripheral permanent magnets 6 is rotated about its axis of rotation 7.

Les positions des aimants périphériques 6 sur les figures 1 et 2 correspondent aux caractéristiques suivantes :

  • gradient du champ magnétique dans la zone centrale 21 mais en dehors du tuyau 34 (sensiblement constant): 211 T/m ; cette position correspond au maximum du gradient
  • Composantes harmonique :
    • ∘ B6 : 1%
    • ∘ B10 : 0,2%
    • ∘ B14 : 0,03 %
The positions of the peripheral magnets 6 on the Figures 1 and 2 correspond to the following characteristics:
  • gradient of the magnetic field in the central zone 21 but outside the pipe 34 (substantially constant): 211 T / m; this position corresponds to the maximum of the gradient
  • Harmonic components:
    • ∘ B6: 1%
    • ∘ B10: 0.2%
    • ∘ B14: 0.03%

Les positions des aimants périphériques 6 sur la figure 3 correspondent aux caractéristiques suivantes :

  • gradient du champ magnétique dans la zone centrale 21 mais en dehors du tuyau 34 (sensiblement constant) : 153 T/m
  • Composantes harmonique :
    • ∘ B6 : 1%
    • ∘ B10: 0,23%
    • ∘ B14 : 0,036 %
The positions of the peripheral magnets 6 on the figure 3 correspond to the following characteristics:
  • gradient of the magnetic field in the central zone 21 but outside the pipe 34 (substantially constant): 153 T / m
  • Harmonic components:
    • ∘ B6: 1%
    • ∘ B10: 0.23%
    • ∘ B14: 0.036%

Les positions des aimants périphériques 6 sur la figure 4 correspondent aux caractéristiques suivantes :

  • gradient du champ magnétique dans la zone centrale 21 mais en dehors du tuyau 34 (sensiblement constant) : 106 T/m; cette position correspond au minimum du gradient
  • Composantes harmonique :
    • ∘ B6 : 1%
    • ∘ B10 : 0,25%
    • ∘ B14 : 0,05 %
The positions of the peripheral magnets 6 on the figure 4 correspond to the following characteristics:
  • gradient of the magnetic field in the central zone 21 but outside the pipe 34 (substantially constant): 106 T / m; this position corresponds to the minimum of the gradient
  • Harmonic components:
    • ∘ B6: 1%
    • ∘ B10: 0.25%
    • ∘ B14: 0.05%

Chaque aimant permanent 6 est libre en rotation à 360° autour de son axe 7.Each permanent magnet 6 is free to rotate 360 ° about its axis 7.

Dans un réglage « fin », la rotation individuelle d'un des aimants périphériques 6 permet un ajustement précis de la qualité du champ magnétique du multi-pôle.In a "fine" setting, the individual rotation of one of the peripheral magnets 6 allows a precise adjustment of the quality of the magnetic field of the multi-pole.

Dans un réglage « global », la rotation d'au moins un des aimants permanents périphériques 6 comprend une rotation de tous les aimants permanents périphériques 6 autour de leur axe de rotation 7 de préférence selon une même valeur angulaire de rotation. Deux aimants permanents périphériques 6 d'un même couple 6a ou 6b tournent dans le même sens de rotation (horaire ou contra horaire). Toute suite de deux aimants permanents périphériques 6 dont les axes de rotation 7 sont successifs, dans le plan de coupe 14 le long d'une boucle fermée 12 entourant le point central 3, tournent dans des sens de rotation opposés (horaire ou contra horaire).In a "global" setting, the rotation of at least one of the peripheral permanent magnets 6 comprises a rotation of all the peripheral permanent magnets 6 about their axis of rotation 7 preferably according to the same angular value of rotation. Two peripheral permanent magnets 6 of the same pair 6a or 6b rotate in the same direction of rotation (clockwise or counterclockwise). Any sequence of two peripheral permanent magnets 6 whose axes of rotation 7 are successive, in the plane of section 14 along a closed loop 12 surrounding the central point 3, rotate in opposite directions of rotation (hourly or counterclockwise) .

La rotation des aimants périphériques 6 permet d'ajouter ou de soustraire, à la partie fixe du champ magnétique créé par les parties en aimant permanent 2, une composante quadripolaire ce qui permet de varier le gradient du quadripôle d'environ 50%.The rotation of the peripheral magnets 6 makes it possible to add or subtract, to the fixed part of the magnetic field created by the permanent magnet parts 2, a quadrupole component, which makes it possible to vary the quadrupole gradient by approximately 50%.

Ainsi on remarque que ce premier mode de réalisation 1 possède de nombreux avantages par rapport à l'état de l'art antérieur :

  • grande variabilité (environ 50%) du gradient du champ magnétique selon la position des aimants périphériques 6,
  • fort gradient maximum du champ magnétique (supérieur à 200 T/m)
  • grande compacité (section du support 10 de 9x9 cm2 dans le plan de coupe 14)
  • structure du multi-pôle 1 compatible avec son utilisation au sein d'un système d'accélération par laser plasma, c'est à dire par exemples avec des aménagements possibles (sur la figure 8, creux 11, 29 entre deux des aimants périphériques 6, situé le long d'un cercle centré sur le point central 3 et passant par ces deux aimants périphériques 6) permettant l'arrivée d'un faisceau 23 laser ou de particules vers le multi-pôle 1 malgré l'encombrement de toutes les pièces (moteurs 26, courroies 27, aimants périphériques 6, etc.) de ce multi-pôle 1.
Thus, it will be noted that this first embodiment 1 has many advantages over the state of the prior art:
  • large variability (about 50%) of the gradient of the magnetic field according to the position of the peripheral magnets 6,
  • strong maximum gradient of the magnetic field (greater than 200 T / m)
  • very compact (support section 10 of 9x9 cm 2 in the plane of section 14)
  • structure of multi-pole 1 compatible with its use within a plasma laser acceleration system, that is to say for example with possible arrangements (on the figure 8 , hollow 11, 29 between two peripheral magnets 6, located along a circle centered on the central point 3 and passing through these two peripheral magnets 6) allowing the arrival of a beam 23 laser or particles to the multi -Pole 1 despite the size of all the parts (motors 26, belts 27, peripheral magnets 6, etc.) of this multi-pole 1.

La figure 9 est une vue de coupe d'un deuxième mode de réalisation de multi-pôle selon l'invention, qui ne sera décrit que pour ses différences par rapport au premier mode de réalisation de multi-pôle selon l'invention.The figure 9 is a sectional view of a second embodiment of multi-pole according to the invention, which will be described only for its differences from the first embodiment of multi-pole according to the invention.

Dans ce deuxième mode de réalisation, chaque partie 2 en aimant permanent comprend plusieurs aimants permanents (deux sur la figure 9) distincts ayant différents sens d'aimantation (tous tangents à un cercle centré sur le point central 3) illustrés par des flèches 20a, 20b, la pointe de chaque flèche 20a, 20b indiquant le pôle nord magnétique de chaque aimant permanent de chaque partie 2 en aimant permanent.In this second embodiment, each permanent magnet part 2 comprises several permanent magnets (two on the figure 9 ) having different directions of magnetization (all tangent to a circle centered on the central point 3) illustrated by arrows 20a, 20b, the tip of each arrow 20a, 20b indicating the magnetic north pole of each permanent magnet of each part 2 permanent magnet.

La figure 10 est une vue de coupe d'un troisième mode de réalisation de multi-pôle selon l'invention, qui ne sera décrit que pour ses différences par rapport au premier mode de réalisation de multi-pôle selon l'invention.The figure 10 is a sectional view of a third embodiment of multi-pole according to the invention, which will be described only for its differences with respect to the first embodiment of multi-pole according to the invention.

Dans ce troisième mode de réalisation, chaque partie 2 en aimant permanent comprend plusieurs aimants permanents (deux sur la figure 9) distincts ayant différents sens d'aimantation (tous tangents à un cercle centré sur le point central 3) illustrés par des flèches 20a, 20b, la pointe de chaque flèche 20a, 20b indiquant le pôle nord magnétique de chaque aimant permanent de chaque partie 2 en aimant permanent. Par rapport au premier mode de réalisation, on remplace chaque aimant d'une partie fixe 2 par deux aimants avec une orientation différente d'aimantation.In this third embodiment, each permanent magnet part 2 comprises several permanent magnets (two on the figure 9 ) having different directions of magnetization (all tangent to a circle centered on the central point 3) illustrated by arrows 20a, 20b, the tip of each arrow 20a, 20b indicating the magnetic north pole of each permanent magnet of each part 2 permanent magnet. With respect to the first embodiment, each magnet of a fixed part 2 is replaced by two magnets with a different orientation of magnetization.

Dans ce troisième mode de réalisation selon l'invention, chaque partie en matière ferromagnétique 4 a une forme d'arc cylindrique muni en outre d'un bord pointu 35 orienté en direction de l'axe 25 et donc du point central 3.In this third embodiment according to the invention, each portion of ferromagnetic material 4 has a cylindrical arc shape further provided with a sharp edge 35 oriented in the direction of the axis 25 and therefore of the central point 3.

Par rapport au premier mode de réalisation, on modifie la forme de l'extrémité des pôles magnétique côté cercle de gorge, de cylindrique à paraboliqueWith respect to the first embodiment, the shape of the end of the magnetic poles on the throat circle, from cylindrical to parabolic, is modified.

Le gradient du multi-pôle est augmenté d'environ 20%.The gradient of the multi-pole is increased by about 20%.

Les positions des aimants périphériques 6 sur la figure 10 correspondent aux caractéristiques suivantes :

  • gradient du champ magnétique dans la zone centrale 21 mais en dehors du tuyau 34 (sensiblement constant) : 305 T/m ; cette position correspond au maximum du gradient
  • Gradient intégré : 32 T
  • Composantes harmonique :
    • ∘ B6 : 3%
    • ∘ B10 : 0,05%
    • ∘ B14 : 0,01 %
The positions of the peripheral magnets 6 on the figure 10 correspond to the following characteristics:
  • gradient of the magnetic field in the central zone 21 but outside the pipe 34 (substantially constant): 305 T / m; this position corresponds to the maximum of the gradient
  • Built-in gradient: 32 T
  • Harmonic components:
    • ∘ B6: 3%
    • ∘ B10: 0.05%
    • ∘ B14: 0.01%

Les positions des aimants périphériques 6 sur la figure 3 mais adapté au cas de ce troisième mode de réalisation de la figure 10 correspondent aux caractéristiques suivantes :

  • gradient du champ magnétique dans la zone centrale 21 mais en dehors du tuyau 34 (sensiblement constant) : 237 T/m
  • Gradient intégré : 24,9 T
  • Composantes harmonique :
    • ∘ B6 : 3%
    • ∘ B10 : 0,05%
    • ∘ B14 : 0,01 %
The positions of the peripheral magnets 6 on the figure 3 but adapted to the case of this third embodiment of the figure 10 correspond to the following characteristics:
  • gradient of the magnetic field in the central zone 21 but outside the pipe 34 (substantially constant): 237 T / m
  • Integrated gradient: 24.9 T
  • Harmonic components:
    • ∘ B6: 3%
    • ∘ B10: 0.05%
    • ∘ B14: 0.01%

Les positions des aimants périphériques 6 sur la figure 4 mais adapté au cas de ce troisième mode de réalisation de la figure 10 correspondent aux caractéristiques suivantes :

  • gradient du champ magnétique dans la zone centrale 21 mais en dehors du tuyau 34 (sensiblement constant) : 153 T/m ; cette position correspond au maximum du gradient
  • Gradient intégré : 17,7 T
  • Composantes harmonique :
    • ∘ B6 : 3%
    • ∘ B10 : 0,05%
    • ∘ B14 : 0,01 %
The positions of the peripheral magnets 6 on the figure 4 but adapted to the case of this third embodiment of the figure 10 correspond to the following characteristics:
  • gradient of the magnetic field in the central zone 21 but outside the pipe 34 (substantially constant): 153 T / m; this position corresponds to the maximum of the gradient
  • Integrated gradient: 17.7 T
  • Harmonic components:
    • ∘ B6: 3%
    • ∘ B10: 0.05%
    • ∘ B14: 0.01%

La figure 11 est une vue de coupe d'un quatrième mode de réalisation de multi-pôle selon l'invention (sans le support 10 qui n'est pas représenté pour alléger cette figure), qui ne sera décrit que pour ses différences par rapport au premier mode de réalisation de multi-pôle selon l'invention.The figure 11 is a sectional view of a fourth embodiment of multi-pole according to the invention (without the support 10 which is not shown to lighten this figure), which will be described only for its differences with respect to the first embodiment of multi-pole according to the invention.

Dans ce quatrième mode de réalisation selon l'invention, chaque partie en matière ferromagnétique 4 n'a pas une forme d'arc cylindrique mais a une forme de parallélépipède rectangle.In this fourth embodiment according to the invention, each portion of ferromagnetic material 4 does not have a cylindrical arc shape but has a rectangular parallelepiped shape.

Dans ce quatrième mode de réalisation selon l'invention, chaque partie en aimant permanant 2 n'a pas une forme d'arc cylindrique mais a une forme de parallélépipède rectangle.In this fourth embodiment according to the invention, each permanent magnet part 2 does not have a cylindrical arc shape but has a rectangular parallelepiped shape.

La figure 12 est une vue de coupe d'un cinquième mode de réalisation de multi-pôle selon l'invention (sans le support 10 qui n'est pas représenté pour alléger cette figure), qui ne sera décrit que pour ses différences par rapport au premier mode de réalisation de multi-pôle selon l'invention.The figure 12 is a sectional view of a fifth embodiment of multi-pole according to the invention (without the support 10 which is not shown to lighten this figure), which will be described only for its differences from the first mode multi-pole embodiment according to the invention.

Dans ce premier mode de réalisation, N=6, c'est-à-dire que le multi-pôle 1 est un sextupôle magnétique.In this first embodiment, N = 6, that is to say that the multi-pole 1 is a magnetic sextupole.

La figure 13 est une vue de coupe d'un sixième mode de réalisation de multi-pôle selon l'invention (sans le support 10 qui n'est pas représenté pour alléger cette figure), qui ne sera décrit que pour ses différences par rapport au premier mode de réalisation de multi-pôle selon l'invention.The figure 13 is a sectional view of a sixth embodiment of multi-pole according to the invention (without the support 10 which is not shown to lighten this figure), which will be described only for its differences from the first mode multi-pole embodiment according to the invention.

Dans ce premier mode de réalisation, N=8, c'est-à-dire que le multi-pôle 1 est un octopôle magnétique.In this first embodiment, N = 8, that is to say that the multi-pole 1 is a magnetic octopole.

Bien sûr, l'invention n'est pas limitée aux exemples qui viennent d'être décrits et de nombreux aménagements peuvent être apportés à ces exemples sans sortir du cadre de l'invention.Of course, the invention is not limited to the examples that have just been described and many adjustments can be made to these examples without departing from the scope of the invention.

Bien entendu, les différentes caractéristiques, formes, variantes et modes de réalisation de l'invention peuvent être associées les unes avec les autres selon diverses combinaisons dans la mesure où elles ne sont pas incompatibles ou exclusives les unes des autres. En particulier toutes les variantes et modes de réalisation décrits précédemment sont combinables entre eux.Of course, the various features, shapes, variants and embodiments of the invention can be associated with each other in various combinations to the extent that they are not incompatible or exclusive of each other. In particular all the variants and embodiments described above are combinable with each other.

Claims (15)

  1. Magnetic multipole (1), comprising:
    - N permanent magnet parts (2) arranged, in a section plane, around a central point (3), N being a positive integer greater than or equal to 2,
    - N ferromagnetic material parts (4), arranged, in the section plane, around the central point (3), the permanent magnet parts (2) and the ferromagnetic material parts (4) being contained in the section plane in an annular zone (5) around the central point (3) while being distributed alternately in the annular zone (5),
    - peripheral permanent magnets (6), each peripheral permanent magnet (6) being mounted in rotation about its own axis of rotation (7), characterized in that the axis of rotation (7) is situated beyond the annular zone (5) with respect to the central point (3).
  2. Magnetic multipole according to claim 1, characterized in that the number of peripheral permanent magnets is N.
  3. Magnetic multipole according to claim 1 or 2, characterized in that each peripheral permanent magnet is equipped with a screen (8) made from ferromagnetic material, such that the axis of rotation (7) of each peripheral permanent magnet (6) is situated on a segment (9) connecting the screen (8) of this peripheral permanent magnet (6) and the central point (3).
  4. Magnetic multipole according to any one of the preceding claims, characterized in that the N permanent magnet parts (2), the N ferromagnetic material parts (4), and the peripheral permanent magnets (6), are held inside one and the same support (10) equipped, around the central point (3), with at least one hollow (11, 29) between two of the peripheral permanent magnets (6).
  5. Magnetic multipole according to any one of the preceding claims, characterized in that N is greater than or equal to 4.
  6. Magnetic multipole according to any one of the preceding claims, characterized in that the N permanent magnet parts (2) are grouped together per pair of permanent magnet parts, each pair of permanent magnet parts comprising two permanent magnet parts located, in the section plane, at symmetrical sites with respect to the central point (3).
  7. Magnetic multipole according to the preceding claim, characterized in that each pair of permanent magnet parts comprises two permanent magnet parts (2) having magnetization in opposite directions.
  8. Magnetic multipole according to any one of the preceding claims, characterized in that the N ferromagnetic material parts (4) are grouped together per pair of ferromagnetic material parts, each pair of ferromagnetic material parts comprising two ferromagnetic material parts located, in the section plane, at symmetrical sites with respect to the central point (3).
  9. Magnetic multipole according to any one of the preceding claims, characterized in that the axes of rotation (7) of the peripheral permanent magnets (6) are distributed, in the section plane, on a circle (12) centred on the central point (3).
  10. Magnetic multipole according to any one of the preceding claims, characterized in that, for each peripheral permanent magnet (6), a linking segment (13), in the section plane, connecting the axis of rotation (7) of this peripheral permanent magnet (6) and the central point (3) passes through one (4) of the N ferromagnetic material parts.
  11. Magnetic multipole according to the preceding claim, characterized in that the linking segment (13, 13a) of each peripheral permanent magnet (6) passes through a part made from ferromagnetic material (4) different from the ferromagnetic material parts (4) passed through by the linking segments (13, 13b) of the other peripheral permanent magnets (6).
  12. Magnetic multipole according to any one of the preceding claims, characterized in that the N peripheral permanent magnets (6) are grouped together per pair of peripheral permanent magnets, each pair of peripheral permanent magnets comprising two peripheral permanent magnets located, in the section plane, at symmetrical sites with respect to the central point (3).
  13. Method for the adjustment of a magnetic multipole according to any one of the preceding claims, comprising rotation of at least one of the peripheral permanent magnets (6) about its axis of rotation (7).
  14. Method according to claim 13, characterized in that the rotation of at least one of the peripheral permanent magnets comprises rotation of all the peripheral permanent magnets (6) about their axis of rotation (7) according to one and the same angular rotation value.
  15. Method according to claim 13 or 14, for adjustment of a magnetic multipole according to claim 12, characterized in that:
    - the two peripheral permanent magnets (6) of one and the same pair turn in the same direction of rotation,
    - any set of two peripheral permanent magnets (6) the axes of rotation of which (7) are successive, in the section plane along a closed loop (12) surrounding the central point (3), turn in opposite directions of rotation.
EP15766410.3A 2014-09-05 2015-08-27 Adjustable magnetic multipole Active EP3189715B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1458335A FR3025689B1 (en) 2014-09-05 2014-09-05 MULTI-POLE MAGNETIC ADJUSTABLE
PCT/EP2015/069649 WO2016034490A1 (en) 2014-09-05 2015-08-27 Adjustable magnetic multipole

Publications (2)

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EP3189715A1 EP3189715A1 (en) 2017-07-12
EP3189715B1 true EP3189715B1 (en) 2018-06-13

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Application Number Title Priority Date Filing Date
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Country Status (3)

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EP (1) EP3189715B1 (en)
FR (1) FR3025689B1 (en)
WO (1) WO2016034490A1 (en)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4549155A (en) * 1982-09-20 1985-10-22 The United States Of America As Represented By The United States Department Of Energy Permanent magnet multipole with adjustable strength
AU7441600A (en) * 1999-09-21 2001-04-24 Magnetic Solutions (Holdings) Limited A device for generating a variable magnetic field

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
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FR3025689A1 (en) 2016-03-11
EP3189715A1 (en) 2017-07-12
WO2016034490A1 (en) 2016-03-10
FR3025689B1 (en) 2018-03-02

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