Abstract: In an arrangement for adjusting the spatial dependence of a magnetic field in a working volume of a main field magnet (19) by means of ferromagnetic field shaping elements (16), the field shaping elements (16) are formed from foils (1, 5, 7, 8) and/or sheet metals (10) having openings (2, 3) whose shape, position and size are selected such that the shape and the amount of the remaining ferromagnetic material produces a desired spatial dependence of the magnetic field in the working volume of the main field magnet for appropriate positioning of the foils (1, 5, 7, 8) and/or sheet metals (10) relative to the working volume of the main field magnet.

Abstract: A magnetic field generator comprises a pair of pole-piece units. The pair of pole-piece units respectively include plate yokes. Each of the plate yokes includes a surface facing the other's and provided with a permanent magnet group and a pole piece. The pole piece includes an annular projection having a plurality of annular-projection pieces and a permanent magnet for reduction of magnetic flux leakage installed on an outside surface of each annular-projection piece. The permanent magnet for reduction of magnetic flux leakage may be disposed with a magnetizing direction thereof being slanted with respect to a main surface of the permanent magnet group.

Abstract: A nuclear fusion reactor system includes a reactor core containing nuclear fusionable material and a plurality of conducting spheres arranged adjacent each other with at least two of said conducting spheres adjacent the reactor core. The reactor core and the conducting spheres form a electro/magnetic circuit such that fusion of fusionable material in the reactor core establishes an electro/magnetic flow around the electro/magnetic circuit. Preferably, a spherical electromagnetic confinement field is initiated around the reactor core such that fusion of the nuclear fusionable material generates a plasma which interacts with the spherical electromagnetic confinement field in a magnethydrodynamic manner. Preferably, electrical energy is inductively extracted in response to the electro/magnetic flow through a coil arrangement located around at least one of the conducting spheres.

Abstract: Magnetic resonance imaging apparatus having a pair of a first magnet device and a second magnet device for generating a magnetostatic field, the pair of magnet devices being installed opposite each other across an examination space for accommodating an examinee; a gradient-field generating device; a high-frequency field generating device; and a yoke for combining the first and second magnetic devices to guide magnetic fluxes generated by the first and second magnetic devices to thereby form a closed magnetic circuit, wherein the yoke includes a first plate member fixed to a first magnet device, a second plate member fixed to a second magnet device and one or more support-post members interconnecting the first plate member and the second plate member, each of the first and second plate members and support-post members includes a plurality of segments formed in a predetermined shape.

Abstract: The invention introduces a method of locomotion that relies on electronically-controlled arrays of electromagnets that permit a spherical or disk-shaped object to move across a magnetic plane by rolling, and also permit the same object to levitate and remain suspended above a surface without further energy expenditure. Another aspect of the invention is a gaming system that implements the above method of locomotion and additionally employs other supporting technologies.

Abstract: In a color cathode ray tube, by optimizing an outer radios of curvature, an inner radius of curvature on a corner portion, a thickness of a long side, a thickness of a short side, a thickness of the corner portion, the total length of the panel, the total length of the funnel body and the total length of a yoke portion of the funnel determining a section shape of the yoke portion of the funnel, a stress concentrated on the yoke portion can be lowered. In addition, according to the increase of an inner radius of curvature of the corner portion of the yoke portion, a crash phenomenon of an electron beam is decreased, and an impact resistance and productivity improvement in fabrication process can be secured by lowering a high stress occurrence on the funnel in vacuum.

Abstract: A method for positioning permanent magnetic blocks includes providing a plurality of magnetized blocks, positioning the magnetized blocks on a yoke in a row by applying a mechanical force at a first end of the row with a first clamping member and at a second end of the row with a second clamping member, and repositioning the blocks by reducing the mechanical force at the first end by moving the first clamping member away from the first end, and moving the second clamping member toward the second end.

Abstract: An intriguing and educational display structure (1) appears to be spinning upon itself without any apparent drive mechanism, power supply or bearing. The structure comprises two concentric hollow spheres (3, 5) spaced apart by a transparent fluid (6). The outer sphere is totally transparent, immobile, and may rest on a tripod (2) or other type of support. The inner sphere may be partially transparent or translucent and carries over its surface, a design such as a map of the world (7). The inner sphere rotates within, and independently from, the first outer one. The internal, that is self-contained, drive mechanism uses either a conventional electrical motor (8) with its own field winding and commutator, or one made of a rotor comprising a cross-array of electromagnets (AC, BD) that interact with an ambient magnetic field such as the earth magnetic field.

Abstract: A gradient coil system for a magnetic resonance apparatus has oblong stiffening elements that are heterogeneously arranged in the gradient coil system such that at least one oscillatory mode of the gradient coil system that can be excited during operation of the magnetic resonance apparatus is reduced.

Abstract: A magnet device includes two sets of static magnetic field generation sources spaced from each other in the vertical direction such that the uniform magnetic field region (patient space) is between then. Each set has concentric current carrying coils to generate a uniform magnetic field in a first direction (the vertical direction).

Abstract: For the purpose of preventing demagnetization of a magnet (32) without any cost increase and improving the max torque and the efficiency of an electric motor (20) by suppressing deterioration of magnetic flux density, a permanent magnet-type electric motor (20) comprises a stator (21) and a rotor (25) disposed in the stator (21), in which a plurality of permanent magnets (32), (32) forming a magnetic pole are inserted in magnet insertion portions (31), (31) of a yoke (26) in such manner that the magnets (32), (32) form in line in the circumferential direction thereof, wherein each magnet (32) is divided into a central magnet (33) that is positioned at the central portion in the width direction of the magnet insertion portion (31) and end magnets (34), (34) that are positioned at end portions of the magnet insertion portion (31), and the end magnets (34), (34) have greater coercive forces than the central magnet (33), whereas the central magnet (33) has a greater magnetic flux density than the end magnets (34)

Abstract: A product line of MRI systems includes a first MRI system including a first yoke and a plurality of magnet blocks forming a first central assembly disposed on the first yoke. The product line also includes a second MRI system including a second yoke, a plurality of magnet blocks forming a second central assembly disposed on the second yoke and shaped the same as the first central assembly, and a first set of magnet blocks mounted to the second yoke at a periphery of the second central assembly.

Abstract: An electromagnet assembly for an electromagnetic apparatus has a ring member, a coil bobbin having an electrical wire wound a spool of the ring member, and a ring case. The ring member is disposed in an annular groove of the ring case. An opening is formed through the ring case adjacent to its closed end surface. A connector, which is disposed on the ring case and covers the opening, includes a case having a closed shape and a bottom, and a cap closing an open end of the case. Ends of the electrical wire and ends of a lead wire are joined in the connector. A projection portion is formed around a fringe portion of a first end surface of the cap and abuts an open end surface of the case. The cap is secured fixedly to the case after the projection portion is melted.

Abstract: The invention relates to a magnetic sensor utilizing a magnetoresistance effect, a method for driving a magnetic sensor utilizing a magnetoresistance effect and a magnetic recording system, and an object of the invention is to overcome the restriction in the level of sensitivity due to the upper limit of the sensing current that can be made to flow. A magneto resistive element 4 is connected to a portion of a feedback loop of a transistor 2 and an LC circuit 3 in an oscillating circuit 1 formed of transistor 2 and LC circuit 3, which is provided with a switching means 5 so that the reading rate of magnetic data is regulated by the switching frequency of switching means 5.

Abstract: A miniature actuator, e.g., for use in a Micro Air Vehicle, comprises at least one nested array of magnets, with an outer annular magnet with a magnetization pointing in an axial direction, a middle annular magnet with a radial magnetization, and an inner cylindrical magnet with a magnetization directed anti-parallel to the magnetization of the outer annular magnet. In one embodiment, a permanent magnet actuator comprises such an array, and a conductive coil having a current distributed over the volume of the conductive coil, wherein the magnetic field of the array is perpendicular to the current located in the coil. The coil may be located above or below the first magnetic array. In another embodiment, a conductive coil is disposed between two magnetic arrays. The coil may have a winding that is pancake-shaped, solenoidal, or toroidal and may comprise more than one winding.

Abstract: A molecular system is provided for nanometer-scale reversible electronic and optical switches, specifically, electric field-activated molecular switches that have an electric field induced band gap change that occurs via rotation of rotor units connected to immobile stator units. The molecular system has two branches on one side of an immobile junction unit and one or two branches on the opposite side to thereby provide “Y” and “X” configurations, respectively. The ends of the branches opposite the junction unit are connected to, or electrically associated with, other molecular systems or substrates, such as electrodes. The rotor units each rotate between two states as a function of an externally-applied field. Both multi-stable molecular mechanical devices and electric field-activated optical switches are provided.

Abstract: Effect of vibration of a refrigerator on a superconducting coil is reduced to reduce disturbance in an image. A coolant tank for supplying a coolant to coil containers is provided separately from the coil containers, and the refrigerator is placed in the coolant tank, and a coolant circulation passage connects between the coolant tank and the coil containers.

Abstract: A magnet system having a magnet coil surrounded by a magnet pot is provided, the magnet coil being electrically connected to contact prongs, an interspace being formed between the outside of the magnet coil and the inside of the magnet pot, in which interspace a free-flowing compound is cast. The magnet coil is surrounded by a thin-walled coil insulating frame on which tubular contact guide elements are integrally molded. The thin-walled coil insulating frame is made of a thermally stable plastic material mixed with mineral fillers.

Abstract: A ferrite magnetic powder for bond magnet that experiences only small decrease in coercivity when molded into a bond magnet is provided, which is a ferrite magnetic powder that includes an alkali-earth metal constituent and exhibits a decrease in coercivity of not greater than 600 Oe when subjected to a prescribed molding test. The magnetic powder can be obtained by mixing a fine ferrite powder of an average particle diameter of greater than 0.50 to 1.0 &mgr;m and a coarse ferrite powder of an average particle diameter of greater than 2.50 to 5.0 &mgr;m at ratio to incorporate the fine powder at a content ratio of 15-40 wt %.

Abstract: The present invention relates to a method and system for adjusting a magnetic center field of a magnetic field generator in an MRI. One embodiment of the presenting invention relates to a magnetic field generator system having a magnetic center field. This embodiment comprises opposing posts and opposing yokes connected to the opposing posts, where at least one of the posts has a spacer. At least one permanent magnetic block is connected to at least one of the opposing yokes. Further, at least one spacer is formed in at least one of the posts, the yokes and/or the permanent magnetic block.

Abstract: A semi-hard magnetic alloy for activation strips in magnetic anti-theft security systems is disclosed that contains 8 to 25 weight % Ni, 1.0 to 4.5 weight % Al, 0.5 to 3 weight % Ti and the balance iron.

Abstract: An iron core includes an electromagnetic steel plate having a first region on the surface of which an insulating film is formed and a second region which is not covered with the insulating film and exposed, and a coating member which coats at least the second region. The second region is formed by removing the insulating film by machining.

Abstract: Opposing concave structures formed in an end portion 22b of a stator yoke 22 and an end portion 23b of a magnetic core 23 are mated in a staggered manner and are joined. An upper projecting portion 22b-1 of the stator yoke 22 is fitted in a recessed portion formed on a lower projecting portion 23b-2 of the magnetic core 23, and the lower projecting portion 23b-2 of the magnetic core 23 is fitted in a recessed portion formed under the upper projecting portion 22b-1 of the stator yoke 22. In this state, the stator yoke 22 and the magnetic core 23 are fixedly fastened by a joint screw 24 and a tube 26. This structure makes it possible to reduce magnetic resistance in a magnetic circuit structure and to improve power-generating efficiency of a power-generating device using the structure.

Abstract: Apparatus, methods and articles of manufacture are disclosed for digital signal modification. Various wave characteristics of an electromagnetic wave may be modified according to desired values. Those values are provided to one or more current sources, wherein the output values of the current sources are modified accordingly.

Abstract: Disclosed is a deflection yoke which is so configured that a coil separator and horizontal deflection coils have angular cross sectional shapes and a ferrite core and vertical deflection coils have circular cross sectional shapes to improve deflection sensitivity thereby reducing power consumption.

Abstract: A magnetic field generator comprises a pair of pole-piece units. The pair of pole-piece units respectively include plate yokes. Each of the plate yokes includes a surface facing the other's and provided with a permanent magnet group and a pole piece. The pole piece includes an annular projection having a plurality of annular-projection pieces and a permanent magnet for reduction of magnetic flux leakage installed on an outside surface of each annular-projection piece. When assembling the pole piece, first, the permanent magnet for reduction of magnetic flux leakage is fixed on the outside surface of each annular-projection piece. At this time, the permanent magnet is slid on the flat outside surface of the annular-projection piece, to a desired position on the annular-projection piece, and then fixed. Each of the annular-projection pieces mounted with the permanent magnet is fixed on a base plate.

Abstract: A superconducting magnet apparatus. By forming one or more holes in each of platelike ferromagnetic substances forming a magnetic shield for focusing the magnetic flux generated by superconducting coils, the flow of lines of magnetic flux is adjusted. Thereby, a static magnetic field in a measurement space is corrected. By disposing coupling tubes for supporting two cooling vessels housing superconducting coils on the rear side with respect to a central axis (Z axis) of the measurement space of the vertical direction, access to the subject is facilitated. In addition, the magnetic shield has an opening portion wider than the superconducting magnet on its side face. After the magnetic shield has been assembled, the superconducting magnet can be inserted from the opening portion.

Abstract: A field coil for an electromagnetic rotor comprising multiple windings, each substantially entirely coated with a powder resin having a dielectric strength of at least in the range of 1000-1500 v/mil. A method of manufacturing a field coil for an electromagnetic rotor includes the steps of a) providing a field coil comprising multiple layers of copper bars; b) coating the multiple layers of the field coil with a powder resin having a dielectric strength of at least about 1000-1500 v/mil.; and c) curing the powder resin.

Abstract: A flux ring for a motor of a power tool has an annular housing which fits inside the motor can of the motor. At least one magnet is on the ring. The at least one magnet includes a portion formed from an isotropic magnetic material and a portion formed from an anisotropic magnetic material. Preferably, the isotropic magnetic material is sandwiched by the anisotropic magnetic material. The magnets being molded onto the flux ring in a two shot process.

Abstract: A magnetic clamping arrangement (10) for holding the arrangement, and in particular a body (5), operably clamped with respect to a ferromagnetic surface (6) by way of a body datum face (8), comprises housing (12) mounted on the body, and electromagnet (16) carried by the housing. The electromagnet comprises a core (18), having three limbs 20.1, 20.2 and 20.3, each terminating in a pole face 22.1, 22.2 and 22.3, being formed by a plurality of ferromagnetic transformer laminations (26). stacked together and slideable with respect to each other in a direction to and from the pole faces. Lamination bias (36), in the form of masses 38, 40.1 and 40.2 of resilient compressible material, defined quiescent pole faces from which individual laminations may depart by sliding when forced against a surface having ridges and/or grooves extending in the lamination planes, but exerts a restoring force on such laminations so displaced.

Abstract: A magnetic field generator for confining plasma within a vacuum chamber is disclosed. The magnetic field generator produces a multi-pole magnetic field around a workpiece positioned within the vacuum chamber. The magnetic field generator is provided outside the vacuum chamber and comprises a plurality of segment type permanent magnets circularly arranged. The magnetic field generator further comprises a plurality of magnetic members to which the segment type permanent magnets are selectively attached.

Abstract: A projection type cathode ray tube device includes a panel, a neck, a funnel connecting the panel to one end of the neck, and a stem closing the other end of the neck. An electron gun is housed in the neck for projecting an electron beam toward a phosphor screen on the panel. The neck includes a small-diameter neck portion disposed on its funnel side, a large-diameter neck portion disposed on its stem side, and a neck junction region connecting the small-diameter neck portion and the large-diameter neck portion. A deflection yoke is disposed in a vicinity of a transition region between the funnel and the small-diameter neck portion. A convergence yoke for generating a beam-convergence magnetic field is disposed to extend from the large-diameter neck portion and surround at least a portion of the neck junction region.

Abstract: For the purpose of efficiently correcting a quadratic term component of a static magnetic field, when an inhomogeneity error of a static magnetic field generated by a pair of magnets supported by yokes so that the magnets face each other across a space is to be corrected, a quadratic term component of the static magnetic field is corrected by a quadratic term component of a magnetic field generated by a pair of circular loop coils, and a zero-th order term component of the magnetic field from the pair of circular loop coils is compensated by a zero-th order term component of a magnetic field generated by coils wound around the yokes.

Abstract: A magnetic dipole ring assembly positioned inside a vacuum chamber and around a wafer being sputter deposited with a ferromagnetic material such as NiFe or other magnetic materials so that the material is deposited with a predetermined magnetization direction in the plane of the wafer. The magnetic dipole ring may include 8 or more arc-shaped magnet segments arranged in a circle with the respective magnetization directions precessing by 720° around the ring. The dipole ring is preferably encapsulated in a vacuum-tight stainless steel carrier and placed inside the vacuum chamber. The carrier may be detachably mounted on a cover ring, on the shield, or on the interior of the chamber sidewall. In another embodiment, the magnet is a magnetic disk placed under the wafer. Such auxiliary magnets allow the magnetron sputter deposition of aligned magnetic layers.

Abstract: A moving coil linear actuator has a bobbin or coil wound as close packed turns of rectangular—cross section wire and radially polarized circumferentially continuous ring magnets which are provided with flux focusing cladding. The result is a light-weight high power linear actuator.

Abstract: An Mn—Zn ferrite wherein 0 to 5000 ppm of a Co oxide in a CO3O4 conversion is contained in a basic component constituted by Fe2O3: 51.5 to 57.0 mol % and ZnO: 0 to 15 mol % (note that 0 is not included) wherein the rest is substantially constituted by MnO; and a value &agr; in a formula (1) below in said ferrite satisfies &agr;≧0.93.

Abstract: A flexible permanent magnet containing atomized, generally spherical rare earth magnet particles bonded in a binder resin including a nitrile rubber and precipitated amorphous silica. The bonded permanent magnet exhibits high mechanical flexibility and elasticity, good magnetic properties, and good heat aging, and the magnet powder may be mixed with the binder resin with little to no risk of combustion. In an exemplary embodiment, a permanent magnet composition includes a nitrile rubber with about 23-37% acrylonitrile content, an ethylene vinyl acetate copolymer, a precipitated amorphous silica, and atomized, generally spherical rare earth magnet particles having a size distribution including a median particle size in the range of about 35-55 &mgr;m with a standard deviation in the range of about 10-30 &mgr;m and less than about 0.1% of the particles having a diameter above about 115 &mgr;m.

Abstract: To provide a magnet roller having a high magnetic force at low cost even if magnetized in a relatively weak magnetic field, having a magnetic force (800 G or higher) sufficient for development even if a plurality of magnetic poles are provided in a main magnetic pole part, and having good resistance to oxidation. The magnet roller (1) of the present invention includes a body part (3) and a shaft part (2) supporting both ends of (3). A plurality of magnetic poles are provided in a magnetized manner in an outer peripheral face of (3), made up of a rare-earth bond magnet made of rare-earth magnetic powder having a composite phase of a hard magnetic phase and a soft magnetic phase both magnetically exchange-interacting with each other and having a coercive force (iHc) of 5 KOe or lower and a residual magnetic flux density (Br) of 5 KG or higher.

Abstract: Display Element for Employment in a Magnetic Anti-theft Security System A semi-hard magnetic alloy for activation strips in magnetic anti-theft security systems is disclosed that contains 8 to 25 weight % Ni, 1.5 to 4.5 weight % Al, 0.5 to 3 weight % Ti and balance iron. The alloy is distinguished over known, employed alloys by excellent magnetic properties and a high resistance to corrosion. Further, the inventive alloy can be excellently cold-worked before the annealing.

Abstract: A field coil for an electromagnetic rotor comprising multiple windings, each substantially entirely coated with a powder resin having a dielectric strength of at least in the range of 1000-1500 v/mil. A method of manufacturing a field coil for an electromagnetic rotor includes the steps of a) providing a field coil comprising multiple layers of copper bars; b) coating the multiple layers of the field coil with a powder resin having a dielectric strength of at least about 1000-1500 v/mil.; and c) curing the powder resin.

Abstract: The present disclosure provides a high performance hybrid magnetic structure made from a combination of permanent magnets and ferromagnetic pole materials which are assembled in a predetermined array. The hybrid magnetic structure provides means for separation and other biotechnology applications involving holding, manipulation, or separation of magnetizable molecular structures and targets. Also disclosed are: a method of assembling the hybrid magnetic plates, a high throughput protocol featuring the hybrid magnetic structure, and other embodiments of the ferromagnetic pole shape, attachment and adapter interfaces for adapting the use of the hybrid magnetic structure for use with liquid handling and other robots for use in high throughput processes.

Abstract: Apparatus and methods for the adjustment of a magnetic field produced by permanent magnet arrangements facing each other across an air gap include a series of ferromagnetic shim blocks individually adjustably positionable within the magnet arrangements to adjust the strength and uniformity of the magnetic field. A backing plate to which the permanent magnets are attached has channels within which adjusting elements are used to move the shim blocks with relation to the permanent magnets, preferably toward or away from the air gap. Shim blocks are arranged in selected geometric arrays and shapes responsive to the geometry of the magnet arrangements and may be formed as toroidal shapes or as individual blocks of varying sizes.

Abstract: A monolithic or dual monolithic magnetic device or apparatus having an array of formations such as protruding or raised nubs wherein adjacent nubs have the same or opposite polarity to produce a high magnetic field gradient in the vicinity of the nubs is described. In lieu of nubs, the use of a magnetic device with thru-holes, blind holes, filled holes, or iron flux concentrators is also detailed, wherein all embodiments result in regions of high magnetic field gradient. Apparatus and methods for spot-poling a magnet array are also illustrated.

Abstract: A process for preparing a magnet roller comprising a plurality of bar-like magnet pieces in a high working efficiency and in an improved adhesion accuracy, which comprises the steps of regulating the bonding position of at least two magnet pieces by their outer peripheral surfaces and their end surfaces, applying an adhesive from the inner surface side of the magnet pieces to the adhesion faces of the magnet pieces for bonding one magnet piece to another magnet piece to form a magnet block, and bonding and fixing the magnet block to a shaft. At least one of the adhesion faces which are in contact with each other may have a plurality of grooves to facilitate penetration of the adhesive into the interface of adjacent two magnet pieces.

Abstract: Disclosed herein is a method for assembling a magnetic field generator for a magnetic resonance imaging system. The method comprises: establishing an arrangement for a permanent magnet of a magnet assembly comprising a ferromagnetic yoke plate and a permanent magnet, wherein the arrangement includes a portion of a cavity formed from placement of a portion of a plurality of retainers attached at substantially the perimeter of the yoke plate. The method also includes populating the first portion of the cavity with a set of rails attached to the yoke plate and affixing a plurality of gliders to a plurality of magnet blocks and magnetizing the gliders and magnet blocks to form a plurality of block assemblies. Finally, the method includes sliding each block assembly of the plurality of block assemblies along a rail of the set of rails; initiating with an outermost rail and concluding with an innermost, securing each successively filled rail with a retainer.

Abstract: A marker for use in a magnetic anti-theft security system has an amorphous ferromagnetic alloy alarm strip and at least one activation strip. The semi-hard magnetic alloy for the activation strip contains 8 to 25 weight % Ni, 1.5 to 4.5 weight % Al, 0.5 to 3 weight % Ti and balance of iron. The alloy is distinguished over known, employed alloys by excellent magnetic properties and a high resistance to corrosion. Further, the alloy can be excellently cold-worked before the annealing.

Abstract: A magnetic device includes a core received in a housing and having three or more outer peripheral surfaces and having one end received in the housing and the other end facing out of the housing. Three or more magnetic members are attached onto the outer peripheral surfaces of the core and secured to the core and the housing with fasteners. The magnetic members include one pole arranged closer to the core and the other pole distal to the core, in order to increase the magnetic field intensity, and to form a unidirectional magnetic line of force, and for allowing the magnetic device to be strongly attracted onto various objects.

Abstract: An electromagnetic-induction coupling apparatus adapted for use as a feeder system for supplying electric power to a spherical semiconductor (10) having a coil (11) on the surface thereof by electromagnetic-induction coupling by means of the coil and/or a data communication system for transferring information signals to and from the spherical semiconductor through the coil. The apparatus comprises a coil array (22) including a plurality of coil elements (21) symmetrically two-dimensionally arranged in the longitudinal and transverse directions, for example, on a given plane, and a magnetic field control element (24) for controlling the respective polarities and phases of magnetic fields generated by means of the individual coil elements of the coil array, thereby changing the respective directions of magnetic fields in a region near the coil array to which the spherical semiconductor is guided.

Abstract: A method for dismantling a magnetic field generator, which includes the steps of providing a plate yoke, and a permanent magnet provided on the plate yoke and having a plurality of neodymium magnets bonded together by an adhesive for the magnetic field generator; heating the magnetic field generator at a temperature of 200° C.˜1000° C.; and thereafter dismantling the magnetic field generator. The dismantling method further includes the step of providing a column yoke connected to the plate yoke for the magnetic field generator.

Abstract: A magnetic field produced by a magnet is measured and modeled as a sum of additive components, each having a different symmetry with respect to the three-dimensional field. The sum of all the additive components completely describes the measured magnetic field, without approximation due to truncation of terms. The degree of non-homogeneity in the measured field is determined by examining the additive components individually. A shim is designed to correspond to a magnitude change of an additive component in order to improve the homogeneity of the magnetic field, such as in an MRI application. The shim is placed in a predetermined location against a metal plate that is connected to or placed near a pole of the magnet, and a plastic plate is attached to the metal plate to hold the shim in place. Grooves are machined into corresponding symmetrical plate locations to complement the shim effect.