Abstract: A cylindrical sleeve of thermally conductive material is provided together with two epoxy impregnated superconductive coils. The cylindrical sleeve defines a circumferentially extending rabbet on either end of the sleeve on the inner diameter. The edge of the outer diameter of each coil is secured in one of the rabbets in the sleeve.

Abstract: A hybrid undulator made from axial arrays of rare-earth permanent magnets and highly permeable pole pieces. The pole pieces and magnets are wedge-shaped, with the same wedge angle, and fit together with the wedge angle of the magnets directed away from the axis and the wedge angle of the pole pieces directed toward the axis. The pole pieces can extend closer to the axis than the magnets. The wedged-pole undulator produces increased on-axis magnetic fields, and the wedge angle can be chosen to prevent magnetic field saturation inside the pole pieces.

Abstract: A deflection yoke is constructed of a truncated conical hollow core, a pair of saddle-shaped horizontal deflection coils disposed inside the core, and a pair of toroidal vertical deflection coils wound on the core or a pair of vertical deflection coils wound in a saddle-like configuration and arranged in the vicinity of the core. A pair of cancellation coils opposing each other on an imaginary axis which passes through a central axis of the core in the direction of vertical deflection are arranged near front end sections of the vertical deflection coils, respectively. A central axis of each of said cancellation coils is inclined at a predetermined angle relative to the central axis of the core. The cancellation coils are connected with the horizontal deflection coils, respectively.

Abstract: A switch arrangement includes three identical insulating support frames in the tubular insulating housings of which one vacuum switching tube each is arranged. Parallel insulating wall elements, at which support elements are molded for drive parts of a spring force drive, project from the insulating housings. An output shaft of the spring force drive is supported at all insulating wall elements while the remaining drive parts are arranged at the insulating wall elements of the center insulating support frame.

Abstract: The invention disclosed herein is a permanent magnet structure which is uul in focusing or guiding charged particle beams, such as those employed in traveling wave tubes, wigglers and undulators. The magnets are annular or planar in shape and have a cross-sectional configuration which is triangular in shape. The cross section forming the triangular magnet sections is that plane which contains the linear beam path and intersects the magnets. The magnetizations of the magnets are oriented perpendicular to the magnetizations of adjacent magnets such that no magnetic poles exist on the outer surface of the permanent magnetic structure.

Abstract: A cylindrical permanent magnet with a longitudinal induced field may be achieved by creating on either side of a zone of interest two annular structures magnetized on the one hand radially with respect to the cylinder axis and on the other hand antisymetrically with respect to the zone of interest. The annular structures may be achieved by arrangements of blocks on polygonal contours. In order to optimize fabrication, the number of blocks in each ring must be higher or equal to four times the number of rings in each structure. The magnet applies particularly to the field of imaging by nuclear magnetic resonance wherein the control logistics had originally been designed for longitudinal induction fields.

Abstract: A deflection yoke assembly for use on a cathode ray tube including an evacuated envelope, a coil separator mounted exteriorly on the evacuated envelope at a location corresponding to the boundary betweeen the funnel section and the neck section and having a generally conical portion, a radially outwardly flanged front end portion at one end of the conical portion and a radially outwardly flanged rear end portion at the opposite end of the conical portion, a pair of horizontal deflection coils and a pair of vertical deflection coils both wound on the coil separator. The deflection yoke assembly comprises a vertical deflection distortion correcting unit including two electromagnetic coil devices mounted on at least said radially outwardly flanged front end portion of the coil separator in alignment with a vertical axis of the evacuated envelope while spaced 180.degree. circumferentially about the longitudinal axis of the envelope.

Abstract: A valve actuator for use in a pressure regulator. It comprises an electromagnetic having a plurality of pole pieces. A valve actuating permanent magnet is moveably secured to one of the pole pieces. The pole pieces are so disposed relative to each other that four distinct magnetic forces combine to urge the permanent magnet in a first or second direction depending on the polarity of current applied to a coil disposed about one of said pole pieces.

Abstract: A superconductive gravimeter comprises a spool (12, 14, 16) and a circumferential magnet (20, 22, 24), both of which are covered with superconductive material (48, 52, 58, 60) except at the magnetic field gaps (54, 56, 62, 64) between them. A force rebalance coil (28, 30) lies in these gaps and supports a superconductive plate (70) above them. Leakage flux flows through the space between the plate and the circumferential magnet. Variations in gravity result in variations in the weight of the plate, resulting in variations in the height of the space, resulting in variations in the flux in the space, which are detected by a pick up coil (74).

Abstract: A hybrid shielding arrangement for solenoid type cryogenic magnets used in MR systems uses both active and passive shielding elements to improve the effective shielding.

Abstract: Device for setting the rotor of a rotary switch in one of three possible switching positions (positions 1 to 3). Such rotary switches can be for example wave guide or coaxial switches. The excitation of windings in this device for a rotary direction is effected by a pair of conductors with a current pulse. This current pulse, via an initial drive system and by means of a drive torque produced by the windings of the latter, moves the rotor from an initial end position (position 1) in the direction of a mid-position (position 3) and to an intermediate position. After the current pulse has been switched off, a permanently imprinted magnetic detent torque brings about the further rotation of the rotor to the mid-position (position 3), where the rotor is centered by the shape of the detent torque. A further current pulse on the same pair of conductors produces a drive moment which moves the rotor from the mid-position (position 3) to the other end position (position 2).

Abstract: A relay apparatus which comprises an armature, means for pivotally mounting the armature, first and second pole pieces dimensioned, configured and disposed for cooperation with the armature, a magnetic circuit including at least one coil, a plurality of iron shunt lamina spanning the magnetic circuit intermediate at least one of the coil and the first and second pole pieces, and a plurality of copper washer slugs in the magnetic circuit intermediate at least one of the first and second pole pieces and the iron shunt lamina. The invention also includes a method of immunizing a relay from alternating current.

Abstract: A solenoid actuator that includes a ferromagnetic armature body mounted for movement through a defined stroke in the direction of its central axis. A stator includes an electrical coil surrounding the axis of the armature, and a ferromagnetic stator body having a first portion axially opposed to the armature body and a second portion radially surrounding and spaced from the armature body. A ferromagnetic ring is positioned on the armature body radially adjacent and opposed to the second portion of the stator body. The opposed surfaces that define the air gap between the armature ring and the stator body are of identical conical construction and overlap each other as viewed in the axial direction.

Abstract: A chip coil wherein the coil wound around the core is enclosed with a sleeve core. The upper surfaces of the core and the sleeve core are ground so as to adjust the inductance of the chip coil.

Abstract: Novel methods of electronically modulating magnetic fields are described. The basic principle of the instant invention is based on the well known Meissner Effect. A superconducting element is placed within a magnetic field whose strength is much less than the critical field of the superconductor. The field flux is excluded out of the superconducting medium. When the superconductor is now forced into its mixed or normal phase by external means, the magnetic field around it is modified and thus modulation of that field near the superconductor surface is possible. Three distinct methods of modulating magnetic fields on the surfaces of superconductors are detailed and some applications disclosed.

Abstract: An electromagnet and plunger assembly including a ring-shaped solenoid coil having a fixed pole component which extends from the one end into the interior of the solenoid coil. Movable in the axial direction, the plunger extends from the other end into the interior of the solenoid coil. A control device serving the adjustment of the armature pull comprises a sensor element measuring the magnetic induction. The pole component is subdivided in two pole parts which are coaxially nested and between which an annular gap is formed. The annular gap is sealed with a magnetically nonconductive material on its end facing toward the plunger. The sensor element is located in the annular gap in the interior of the solenoid coil.

Abstract: Ferromagnetic pieces are mounted on a plurality of nonmagnetic radial rods located at desired locations parallel to a pole face of a permanent magnet used in a magnetic resonance imaging apparatus. The pieces comprise plates which are translatable radially along each rod. Each rod carrying the plates are each rotatable about the rod axis to produce an error field cancelling environmentally induced, low order perturbations. A method for accomplishing same is also included. In a preferred embodiment, the plates are mounted on radial rods positioned at equal angles from one another, preferably thirty degrees (30.degree.) apart and arranged as spokes of a wheel.

Abstract: A shield is provided for a magnet of the type used in magnetic resonance imaging or spectroscopy to limit the fringe field of a superconducting magnet to specified boundaries when the magnet is generating a magnetic field having a strength required for normal magnet operation. The shield includes a number of steel rectangular plates position around the magnet to form respective sides of a shield, the shield having a cross section in the form of a polygon such as a octrahedron. End caps having the shape of such polygon are joined to the ends of the plates. Structure is provided for supporting the magnet for movement as an integral unit relative to the shield. The supporting structure includes a first set of adjusting mechanisms for moving the magnet vertically and a second set of adjusting mechanisms for moving the magnet laterally, relative to the shield, to move the axis of the magnet into alignment with the shield axis, to avoid magnet quenching and inhomogeneities in the field generated by the magnet.

Abstract: A reduced length, high field strength magnet, comprised of a number of superconducting magnet coils has ferromagnetic compensation rings positioned coaxially around the magnet bore axis to reduce axial inhomogeneities. The rings are positioned symmetrically around the bore axis centerpoint. Both the position of the magnet coils and the position of the ferromagnetic compensation rings are determined by an iterative optimization process checked by finite element modeling.

Abstract: Industrial problems concerning the production of a field of uniform and traverse induction are solved by providing a cylindrical magnet with magnetic blocks of which the internal magnetization is either radial or tangential to the cylinder. Such an arrangement facilitates the fabrication and the magnetization of the blocks. A radial or tangential magnetization distribution produces a transverses field only if the magnetization modulus varies respectively with the cosine or the sine of the localization angle of the block with respect to the direction of induction to be produced. By combining both structures, it is even possible to obtain a magnet having a zero bipolar moment. The variation of the magnetization modulus is obtained by providing composite magnetic bricks. They comprise plates of magnetic materials which are coupled to non-magnetic plates in a proportion dependeing on the reduction of magnetization to be achieved. Such a magnet applies to imaging by nuclear magnetic resonance in the medical field.