Class / Patent application number | Description | Number of patent applications / Date published |
505162000 | Magnetic field sensing system or device (e.g., SQUID, etc.) | 71 |
20080318793 | Method For Producing a Superconductive Element - The invention relates to a method for producing a superconductive element to be used as a wire-in-channel superconductor in magnetic resonance imaging (MRI) and in nuclear magnetic resonance (NMR) applications, which superconductive element contains a superconductive wire and a copper component having a longitudinal groove and the superconductive wire being positioned in the groove. In order to produce the wire-in-channel superconductive element by a mechanical contact between the superconductive wire and a wall of the groove in the copper component, at least one contact surface is coated with a lead free solder material before having the mechanical contact. In order to enhance the thermal and electrical conduction and to create a bond between the said components the soldering material is fused in annealing process step. | 12-25-2008 |
20090054242 | SUPERCONDUCTING WIRE, METHOD OF MANUFACTURING THE SAME, ANTENNA COIL FOR NMR PROBE AND NMR SYSTEM USING THE SAME - A superconducting wire, a method of manufacturing the superconducting wire, an antenna coil and a NMR system are disclosed. At least a superconducting material, a paramagnetic material and a diamagnetic material are closely attached and integrated with each other to form a longitudinally continuous wire. The paramagnetic material and the diamagnetic material are arranged in such a manner that the magnetic properties of the paramagnetic material and the diamagnetic material substantially offset each other in the longitudinal and diametrical directions. A superconducting layer is exposed to a part or the whole of the outer periphery of the wire. A low-resistance material layer is formed inside the superconducting layer. | 02-26-2009 |
20090275475 | VACUUM VESSEL FOR COOLED EQUIPMENT - An annular end piece for a cylindrical vacuum vessel, comprising a metal end piece ( | 11-05-2009 |
20090280988 | CORELESS AND BRUSHLESS DIRECT-CURRENT MOTOR, GIFFORD MCMAHON (GM) CRYOGENIC COOLER, PULSE TUBE CRYOGENIC COOLER, CRYOPUMP, MAGNETIC RESONANCE IMAGING (MRI) APPARATUS, SUPERCONDUCTING MAGNET (SCM) APPARATUS, NUCLEAR MAGNETIC RESONANCE (NMR) APPARATUS, AND CRYOGENIC COOLER FOR COOLING SEMICONDUCTOR - A coreless and brushless direct-current motor includes an armature coil wound without core and formed in the shape of a saddle; an outside rotor magnet formed by a permanent magnet, the outside rotor magnet being provided at an outside of the armature coil in the shape of a cylinder so as to face the armature coil, the outside rotor magnet being rotated by the magnetic field; an inside rotor magnet formed by a permanent magnet, the inside rotor magnet being provided in the shape of a cylinder at an inside of the armature coil so that the inside rotor magnet has a pole opposite to the outside rotor magnet and a rotational shaft is independently provided; an output shaft connected to the inside rotor magnet; and a sealing part of a barrier structure which sealing part partitions the armature coil and the outside rotor magnet to an outside of the inside rotor magnet and seals the armature coil and the outside rotor magnet. | 11-12-2009 |
20090291850 | Cryostat Having A Magnet Coil System, Which Comprises An Under-Cooled Lts Section And An Hts Section Arranged In A Separate Helium Tank - A cryostat ( | 11-26-2009 |
20100016168 | APPARATUS AND METHOD FOR TRANSPORTING CRYOGENICALLY COOLED GOODS OR EQUIPMENT - In an apparatus and method for transporting cryogenically cooled goods or equipment, a cryostat containing the cryogenically cooled goods or equipment and partially filled with liquid cryogen is provided with a cryogenic refrigerator for active cooling; and auxiliary equipment sufficient to maintain the cryogenic refrigerator in operation, are all mounted on a transportable carrier such that the transportable carrier may be transported with the cryogenic refrigerator in operation without connection of any of the cryostat, refrigerator and auxiliary equipment to any supplies located off of the transportable carrier. | 01-21-2010 |
20100056378 | DETECTING QUENCH IN A MAGNETIC RESONANCE EXAMINATION SYSTEM - The present invention relates to a magnetic resonance examination system ( | 03-04-2010 |
20100248968 | APPARATUS AND METHOD FOR COOLING A SUPERCONDUCTING MAGNETIC ASSEMBLY - A superconducting magnet assembly and method of cooling a superconducting magnet assembly. An embodiment of the method of manufacturing a superconducting magnet assembly includes: providing a housing configured about a vacuum reservoir; forming a coil former; surrounding the coil former with a thermal shield; locating the thermal shield in the vacuum reservoir; positioning a superconducting magnet about the coil former, wherein the superconducting magnet is configured about a central core to receive an object; providing a second vacuum reservoir having a cryogen reservoir therein; providing two two-phase heat transfer devices wherein each comprises tubing having an evaporator region and a condenser region; thermally connecting the evaporator region of one of the heat transfer devices with the coil former and/or the superconducting magnet and the evaporator region of the other two-phase heat transfer device with the thermal shield; and thermally connecting a cryocooler to the cryogen reservoir and to the condensing region of both heat transfer devices. | 09-30-2010 |
20100304976 | ELECTROMAGNET WITH LAMINATED FERROMAGNETIC CORE AND SUPERCONDUCTING FILM FOR SUPPRESSING EDDY MAGNETIC FIELD - An electromagnet comprises: a ferromagnetic core ( | 12-02-2010 |
20110015078 | CRYOGENICALLY COOLED SUPERCONDUCTOR RF HEAD COIL ARRAY AND HEAD-ONLY MAGNETIC RESONANCE IMAGING (MRI) SYSTEM USING SAME - A superconducting main magnet system for a head-dedicated MRI system is provided, and a head-only MRI system may comprise such a superconducting main magnet and a cryogenically-cooled superconducting RF head-coil array. The superconducting main magnet may comprise a first and second set of high temperature superconductor coils which are configured to be coaxial relative to a common longitudinal axis. The first coil set includes at least two coils having an inner radius and disposed in a first region of a length along the common axis to cover a head and neck of a human body, and the second coil set includes at least one coil having an inner radius and disposed in a second region of a length along the common axis to cover a portion of a human torso, wherein the inner radius of the second coil set is greater than the inner radius of the first coil set. The first and second coils are configured to provide a uniform magnetic field in the first region to provide for imaging a region of interest of the individual's head when positioned within the first region. | 01-20-2011 |
20110065584 | Superconducting magnet coil system with quench protection for the prevention of excessive localized currents - A superconducting high-field magnet coil system comprising several radially nested main coil sections ( | 03-17-2011 |
20110065585 | SYSTEMS, METHODS AND APPARATUS FOR MEASURING MAGNETIC FIELDS - SQUIDs may detect local magnetic fields. SQUIDS of varying sizes, and hence sensitivities may detect different magnitudes of magnetic fields. SQUIDs may be oriented to detect magnetic fields in a variety of orientations, for example along an orthogonal reference frame of a chip or wafer. The SQUIDS may be formed or carried on the same chip or wafer as a superconducting processor (e.g., a superconducting quantum processor). Measurement of magnetic fields may permit compensation, for example allowing tuning of a compensation field via a compensation coil and/or a heater to warm select portions of a system. A SQIF may be implemented as a SQUID employing an unconventional grating structure. Successful fabrication of an operable SQIF may be facilitated by incorporating multiple Josephson junctions in series in each arm of the unconventional grating structure. | 03-17-2011 |
20110082043 | Superconducting Magnet System for Generating High Homogeneity and High Magnetic Field - A superconducting magnet system for generating high homogeneity and high magnetic field consists of a main coil, an outer coil, a quench protection circuit, a quench heater and a power supply. The main coil is composed of many concentric solenoid coils which are arranged from inside to outside. The outer coil out of the main coil includes a first back roll coil, a second back roll coil, a first superconducting coil for compensating sixth harmonic component, a second superconducting coil for compensating sixth harmonic component, a shielding ring and a shielding coil from inside to outside. Every loop circuit of the quench protection circuit is composed of a corresponding protection resistor, a diode and coil which is connected in series each other, and each coil has a corresponding quench protection heater. The classification linear diameter difference of the superconducting coils which contact each other in main coil is less than 0.05 mm. The homogeneity of the magnetic field in the 50 mm diameter working space is 0.15 ppm, because the high order harmonic component of the field is compensated by back roll method. | 04-07-2011 |
20110105334 | APPARATUS AND METHOD FOR INSTALLING COOLING TUBES ON A COOLED FORMER - A superconducting magnet structure has a thermally conductive former with a former body having a former surface and a channel in said former surface that is open at said former surface, a thermally conductive tube disposed in the channel and configured to receive a circulating coolant therethrough, and the former body has at least one deformable retaining element integrally formed as a part of said former body and projecting from said surface of the former body next to the channel and being deformed over said tube in the channel to cover the tube in said channel and retain the tube in the channel. | 05-05-2011 |
20110124507 | SUPERCONDUCTING LOOP, SADDLE AND BIRDCAGE MRI COILS - New MRI coil and resonators are disclosed based solely on superconducting inductive element and built-in capacitive elements as well as hybrid superconducting-metal inductive and capacitive elements having superior SNR. Single and multiple small animal MRI imaging units are also disclosed including one or more resonators of this invention surrounding one or more small animal cavities. Methods for making and using the MRI coils and/or arrays are also disclosed. | 05-26-2011 |
20110257017 | SUPERCONDUCTING MAGNET - There is provided a superconducting magnet including a superconducting coil, in which the superconducting coil includes: a bobbin; one or more superconducting wires wound around the bobbin in a plurality of turns, each superconducting wire being one or more superconducting filaments embedded in a matrix; and one or more metallic members, each metallic member being in electrical and thermal contact with a plurality of portions of the one or more superconducting wires. | 10-20-2011 |
20110312499 | COIL ELEMENT DECOUPLING FOR MRI - An RF coil adjacent an imaging region includes a plurality of conducting coil elements, with each conducting coil element including a proximal portion and a distal portion. The RF coil also includes a capacitance between the distal portions of the at least two conducting coil elements. A mutual coupling inductance between at least two conducting coil elements of the plurality of conducting coil elements is substantially cancelled by the capacitance between the distal portions of the at least two conducting coil elements. | 12-22-2011 |
20120021915 | SUPERCONDUCTING JOINT AND METHOD FOR MANUFACTURING SAME - There is provided a superconducting joint for electrically connecting a first multifilamentary superconducting wire including a plurality of first superconducting filaments embedded in a first stabilizer matrix and a second multifilamentary superconducting wire including a plurality of second superconducting filaments embedded in a second stabilizer matrix. The joint includes: a first bundle of bare superconducting filaments being formed by removing the first stabilizer matrix at an end joint portion of the first superconducting wire; a second bundle of bare superconducting filaments being formed by removing the second stabilizer matrix at an end joint portion of the second superconducting wire; and an intermediate superconductor interposed in contact relationships between the first and the second bundles, a critical current density of the intermediate superconductor under an operating condition of the superconducting joint being less than a critical current density of the bare superconducting filaments under the operating condition. | 01-26-2012 |
20120028805 | SYSTEM AND METHOD FOR OPERATING A MAGNETIC RESONANCE IMAGING SYSTEM DURING RAMPING - Systems and methods for operating a magnetic resonance imaging (MRI) during ramping are provided. One method includes reducing pressure in a cryogen vessel of an MRI system during magnet ramping. The method also includes returning pressure in the cryogen vessel to a normal operating pressure level after magnet ramping is complete. | 02-02-2012 |
20120040838 | COIL WITH SUPERCONDUCTIVE WINDINGS COOLED WITHOUT CRYOGENIC FLUIDS - A coil comprises a set of windings with a generally annular shape and formed by a plurality of series-connected partial windings made of a superconductor with a high critical temperature, in which these partial windings are arranged next to each other in stratified form, and at least one cooling sheet which is made of thermally conductive material and arranged in contact with this set of windings and which is designed to be connected in a thermally conductive manner to a cryogenic cooling system. | 02-16-2012 |
20120065072 | SUPERCONDUCTING METALLIC GLASS TRANSITION-EDGE-SENSORS - A superconducting metallic glass transition-edge sensor (MGTES) and a method for fabricating the MGTES are provided. A single-layer superconducting amorphous metal alloy is deposited on a substrate. The single-layer superconducting amorphous metal alloy is an absorber for the MGTES and is electrically connected to a circuit configured for readout and biasing to sense electromagnetic radiation. | 03-15-2012 |
20120065073 | Magnetic Module - A magnetic field source is provided comprising a support structure upon which is positioned a conducting surface path of superconductor material. The support structure has an at least partially radially overlapping layer of material arranged in a spiral. A corresponding conducting surface path of superconductor material is arranged on the surface of the support structure such that the conducting path has a first point for the introduction of current and a second point for the extraction of current. | 03-15-2012 |
20120088674 | MEASURING INSTRUMENT, ELECTRICAL RESISTANCE ELEMENTS AND MEASURING SYSTEM FOR MEASURING TIME-VARIABLE MAGNETIC FIELDS OR FIELD GRADIENTS - The invention relates to a measuring instrument for time-variable magnetix fluxes, or flux gradients, to electrical resistance elements, and to a measuring system comprising a measuring instrument or electrical resistance element according to the invention. The core component of the measuring instrument is a flux transformer composed of a base material which has a phase transition to the superconducting state. According to the invention, even when the base material is in the superconducting state, this flux transformer comprises at least one load region having electrical resistance that is other than zero for dissipating the electric energy in the conductor loop thereof. For this purpose, according to the invention the conductor loop and the magnetic field source are disposed in one plane and are typically photolithographically structured. The resistance elements according to the invention, having resistance values of ≦10 | 04-12-2012 |
20120157319 | High-Temperature Superconducting Magnetic Sensor and Fabrication Method of the Same - A high-temperature superconducting magnetic sensor having a superconducting layer formed on a substrate and a plurality of superconducting quantum interference devices fabricated on the superconducting layer, which includes: a plurality of input coils that are formed on the superconducting layer and connected to or magnetically coupled with each of the plurality of the superconducting quantum interference devices; a pickup coil that is formed on the superconducting layer and connected so as to form a closed loop together with the plurality of the input coils; and a plurality of trimming wires that are formed on the superconducting layer and can be cut off, while making a short-circuit between both ends of each of the plurality of the input coils. | 06-21-2012 |
20120157320 | RARE-EARTH REGENERATOR MATERIAL PARTICLES, AND GROUP OF RARE-EARTH REGENERATOR MATERIAL PARTICLES, REFRIGERATOR AND MEASURING APPARATUS USING THE SAME, AND METHOD FOR MANUFACTURING THE SAME - Provided is a group of rare-earth regenerator material particles having an average particle size of 0.01 to 3 mm, wherein the proportion of particles having a ratio of a long diameter to a short diameter of 2 or less is 90% or more by number, and the proportion of particles having a depressed portion having a length of 1/10 to ½ of a circumferential length on a particle surface is 30% or more by number. By forming the depressed portion on the surface of the regenerator material particles, it is possible to increase permeability of an operating medium gas and a contact surface area with the operating medium gas. | 06-21-2012 |
20120184444 | ELECTRICALLY CONDUCTIVE SHIELD FOR SUPERCONDUCTING ELECTROMAGNET SYSTEM - In a superconducting electromagnet system or method, cryogenically cooled magnet coils are arranged to provide a static magnetic field in an imaging region. A gradient coil assembly is arranged to provide oscillating magnetic fields within the imaging region. An electrically conductive shield is positioned between the cryogenically cooled magnet coils and the gradient coil assembly. The cryogenically cooled magnet coils are located within an outer vacuum chamber, and the electrically conductive shield is positioned outside the outer vacuum chamber between a surface of the outer vacuum chamber and the gradient coil assembly and inside a bore tube of the outer vacuum chamber. The conductive shield is supported on resilient damping mounts between the conductive shield and the gradient coil assembly and between the conductive shield and the bore tube of the outer vacuum chamber. | 07-19-2012 |
20120190552 | PRECOOLING DEVICE, SUPERCONDUCTING MAGNET AND MAGNETIC RESONANCE IMAGING APPARATUS - A precooling device for a thermal radiation shield of a superconducting magnet has a mechanical heat conductive member in contact with the thermal radiation shield of a superconducting magnet, for cooling the thermal radiation shield down to a second temperature before the second stage of precooling of the superconducting magnet, this second temperature being below the temperature of the thermal radiation shield after a first stage of precooling of the superconducting magnet. A superconducting magnet and magnetic resonance imaging equipment embody such a precooling device. The precooling device reduces the external radiation heat onto a cryogen vessel, thereby reducing the consumption of cryogen. | 07-26-2012 |
20120202696 | OPEN-STRUCTURE MAGNETIC ASSEMBLY FOR MAGNETIC RESONANCE IMAGING - An open-structure magnetic assembly is adapted to generate a homogeneous magnetic field in an accessible space region, including a first and second independent source of magnetic field ( | 08-09-2012 |
20120258862 | OPEN-BORE MAGNET FOR USE IN MAGNETIC RESONANCE IMAGING - A magnetic resonance system is provided which employs a shielded, electromagnetically asymmetric and low-stress magnet to produce a superior sized imaging region close to the patient side. The magnet has a double layered configuration. In the primary layer, the magnet includes at least two strongest coils at two ends of the magnet (end coils), which carry current in the same direction. The magnet may include at least one coil close to the end coils which carries current in a direction opposite to that of the end coils. The magnet employs a plurality of smaller sized coils ( | 10-11-2012 |
20120264614 | LOW TEMPERATURE PRESSURE CHAMBER UNIT, MAGNETIC RESONANCE DEVICE WITH A LOW TEMPERATURE PRESSSURE CHAMBER UNIT, AND AN ATTACHMENT METHOD TO ATTACH AT LEAST ONE ADD-ON UNIT TO AN EXTERNAL HOUSING OF A LOW TEMPERATURE PRESSURE CHAMBER UNIT - In order to attach an add-on unit to a low temperature pressure chamber unit having a low temperature pressure chamber, and an external housing surrounding the low temperature pressure chamber, an attachment device is used to attach at least one add-on unit to the external housing, and the attachment device has an adhesive unit designed for the arrangement and/or attachment of the at least one add-on unit to the external housing. | 10-18-2012 |
20120309630 | PENETRATION TUBE ASSEMBLIES FOR REDUCING CRYOSTAT HEAT LOAD - A penetration assembly for a cryostat is presented. The penetration assembly includes a wall member having a first end and a second end and configured to alter an effective thermal length of the wall member, where a first end of the wall member is communicatively coupled to a high temperature region and the second end of the wall member is communicatively coupled to a cryogen disposed within a cryogen vessel of the cryostat. | 12-06-2012 |
20130012392 | SUPERCONDUCTING SWITCH, SUPERCONDUCTING MAGNET AND MRI - A superconducting switch is provided in which the structural strength of the superconducting switch is kept, and thermal efficiency between a superconducting film and a heater is high when an ON state (superconducting state) and an OFF state (normal conducting state) of the superconducting switch are switched. The superconducting switch includes a substrate, a heater for generating heat by energization, a conductive film, and a MgB | 01-10-2013 |
20130023418 | TUBULAR THERMAL SWITCH FOR THE CRYO-FREE MAGNET - When cooling a superconducting magnet for use in a magnetic resonance imaging (MRI) device, a two-stage cryocooler ( | 01-24-2013 |
20130079229 | CRYOGENIC COOLING SYSTEM WITH WICKING STRUCTURE - A cryogenic cooling system includes a chamber defined by an outer wall and an inner wall, the chamber housing at least one component to be cooled; a wicking structure in thermal contact with one of the outer wall and the inner wall of the chamber; and a delivery system in a spaced apart relationship with the chamber and fluidly connected to the wicking structure for transporting a working fluid to and from the wicking structure. Also provided is a magnetic resonance imaging system including the cryogenic cooling system. | 03-28-2013 |
20130090241 | SUPERCONDUCTIVE ELECTROMAGNET APPARATUS - A superconductive electromagnet apparatus and a magnetic resonance imaging apparatus including the superconductive electromagnet apparatus are provided. The superconductive electromagnet apparatus includes a thermal anchor, a cryogenic cooling device which cools the thermal anchor, and at least one connecting ring into which the thermal anchor is inserted and a plurality of wires which are connected to the connecting ring. | 04-11-2013 |
20130096007 | SUPERCONDUCTIVE ELECTROMAGNET APPARATUS AND COOLING APPARATUS AND METHOD THEREOF - A magnetic resonance imaging apparatus has a plurality of cooling pipes disposed while being spaced apart from each other along a longitudinal length of the coil assembly, a first manifold connected to a lower end of the plurality of cooling pipes to distribute and supply a coolant to the plurality of cooling pipes, and a second manifold connected to an upper end of the plurality of cooling pipes to be supplied with the coolant from the plurality of cooling pipes, thereby able to evenly cool off the coil assembly in a longitudinal direction thereof. | 04-18-2013 |
20130102472 | PERSISTENT-MODE HIGH-TEMPERATURE SUPERCONDUCTING SHIM COILS TO ENHANCE SPATIAL MAGNETIC FIELD HOMOGENEITY FOR SUPERCONDUCTING MAGNETS - A persistent-mode High Temperature Superconductor (HTS) shim coil is provided having at least one rectangular shaped thin sheet of HTS, wherein the thin sheet of HTS contains a first long portion, a second long portion parallel to first long portion, a first end, and a second end parallel to the first end. The rectangular shaped thin sheet of high-temperature superconductor has a hollow center and forms a continuous loop. In addition, the first end and the second end are folded toward each other forming two rings, and the thin sheet of high-temperature superconductor has a radial build that is less than 5 millimeters (mm) and able to withstand very strong magnetic field ranges of greater than approximately 12 Tesla (T) within a center-portion of a superconducting magnet of a superconducting magnet assembly. | 04-25-2013 |
20130123109 | DEMOUNTABLE CURRENT LEAD UNIT AND SUPERCONDUCTING MAGNET APPARATUS EMPLOYING THE SAME - A demountable current lead unit and a superconducting magnet apparatus employing the same include an inserting module that is demountably inserted into a superconducting magnet apparatus and electrode leads electrically connected to a superconducting coil and cooling pipes disposed in the respective electrode leads; a service module including a power supply source for supplying a current to the electrode leads, a refrigerant storage tank for supplying a refrigerant to the cooling pipe, and a controller for controlling a flow of the refrigerant to the cooling pipe; and a transmission pipe line for connecting the inserting module and the service module. | 05-16-2013 |
20130123110 | RE-CONDENSATION DEVICE AND NMR ANALYSIS DEVICE PROVIDED THEREWITH - A re-condensation device allows an NMR analysis device to be reduced in overall size and minimizes heat penetration into a liquid helium tank. An NMR analysis device provided with said re-condensation device. The re-condensation device includes: a second cooling member, part of which is inserted into a neck tube, and which re-condenses liquid helium; and a first cooling member, part of which is inserted into the neck tube. The second cooling member is thermally connected to a chiller's second cooling stage, and the first cooling member is thermally connected to the chiller's first cooling stage. The first cooling member has: a first insertion part, which has a diameter that allows insertion into the neck tube; and an inside contact part on the outer surface of the first insertion part and that cools heat seals by contacting, from the inside, a part of the neck tube that outside contact parts contact. | 05-16-2013 |
20130157865 | SYSTEM FOR MAGNETIC FIELD DISTORTION COMPENSATION AND METHOD OF MAKING SAME - A system and method for magnetic field distortion compensation includes a cryostat for a magnetic resonance imaging (MRI) system. The cryostat includes a vacuum casing having a vacuum therein. A cryogen vessel is disposed within the casing, the vessel having a coolant therein. A thermal shield is disposed between the vacuum casing and the cryogen vessel. An eddy current compensation assembly is disposed within the casing. The eddy current compensation assembly includes a plurality of electrically conductive loops formed on one of the vacuum casing, the cryogen vessel, and the thermal shield and constructed to mitigate vibration-induced eddy currents in the MRI system. | 06-20-2013 |
20130178366 | NUCLEAR MAGNETIC RESONANCE PROBE COMPRISING INFRARED REFLECTION PATCHES - A nuclear magnetic resonance (NMR) probe comprises a substrate, a probe coil formed on the substrate and comprising a superconducting material, and a plurality of infrared (IR) reflection patches formed on the substrate around the probe coil. | 07-11-2013 |
20130178367 | NMR Spectrometer and Method of Setting Up the Same - An NMR spectrometer and method in the following three steps are performed. (1) An external magnetic field is set to H | 07-11-2013 |
20130184158 | Superconducting Magnet System for Nuclear Magnetic Resonance with High Magnetic Field and High Degree of Homogeneity of Magnetic Field - A superconducting magnet system for nuclear magnetic resonance with a high magnetic field and a high degree of homogeneity of magnetic field is provided. The system comprises a main coil and a magnetic field homogeneity compensating coil having a combination of a forward current and a reverse current, and is composed of 24 superconducting coils formed by winding NbTi/Cu low-temperature superconducting wires. The system can produce a magnetic field of 9.4 T within a room-temperature space of 800 mm and can obtain a degree of non-homogeneity of magnetic field less than 0.1 ppm within a spherical volume of 300 mm. The system is equipped with a superconducting magnet inside, and a low-temperature vessel for liquid helium provides a low-temperature environment of 4K which is required for the normal operation of the superconducting magnet. A ferro-magnetic shielding system enables the system to have a good electromagnetic compatibility. | 07-18-2013 |
20130203603 | CRYOCOOLER SYSTEM AND SUPERCONDUCTING MAGNET APPARATUS HAVING THE SAME - A cryocooler system and a superconducting magnet apparatus having the cryocooler system include a cryocooler having a cool stage that cools a heat shielding unit and a thermal inertia that thermally contacts the cool stage of the cryocooler and has a high heat capacity. The cryocooler system reduces a temperature-increasing rate in a current lead by using the thermal inertia member when the temperature in the current lead is increased due to heat generated when an electrical current applied to a superconducting coil is ramped-up or ramped-down. | 08-08-2013 |
20130231248 | SUPERCONDUCTIVE ELECTROMAGNET APPARATUS - Provided is a superconductive electromagnet apparatus including a thermal anchor, a plurality of wires and a cryogenic cooling device which cools the thermal anchor. The thermal anchor includes a body part, at least one connecting part disposed on a surface of the body part and made up of a conductive material. The plurality of wires is connected to the connecting part. | 09-05-2013 |
20130331269 | Coil System for a Magnetic Resonance Tomography System - A coil system for a magnetic resonance tomography system includes a plurality of coils for sending and/or receiving high-frequency signals. The plurality of coils is disposed in a receiving chamber between a tomography magnet and a lining of an opening in the tomography magnet and may be cooled by a cooling apparatus. When the coil system is in an operating state, the receiving chamber is filled with a cryogenic cooling medium. | 12-12-2013 |
20140018243 | MAGNETIC FIELD GENERATION DEVICE WITH ALTERNATIVE QUENCH DEVICE - A magnetic field generation device for a magnetic resonance tomography apparatus has a vacuum container that encloses a magnetic coil made of superconducting material, and a conduit of a pipe system is connected with the magnetic coil so as to conduct heat. The pipe system and the conduit are filled with a coolant that places the magnetic coil in a superconducting state during normal operation of the tomography system. A valve connects the pipe system to the interior of a capture container. In the event of non-normal operation, such as a quench, evaporated coolant passes through the valve into the capture container. | 01-16-2014 |
20140024533 | Precursor of MgB2 Superconducting Wire, and Method for Producing the Same | 01-23-2014 |
20140057792 | NMR RF PROBE COIL EXHIBITING DOUBLE RESONANCE - NMR probe coils designed to operate at two different frequencies, producing a strong and homogenous magnetic field at both the frequencies. This single coil, placed close to the sample, provides a method to optimize the NMR detection sensitivity of two different channels. In addition, the present invention describes a coil that generates a magnetic field that is parallel to the substrate of the coil as opposed to perpendicular as seen in the prior art. The present invention isolates coils from each other even when placed in close proximity to each other. A method to reduce the presence of electric field within the sample region is also considered. Further, the invention describes a method to adjust the radio-frequency tuning and coupling of the MAR probe coils. | 02-27-2014 |
20140066312 | Magnet system for generation of a highly stable magnetic field - A magnet system generates a highly stable magnetic field at a sample location. The magnet system has a magnet cryostat housing a first superconducting magnet coil and a second magnet coil co-axial to the first magnet coil. The second magnet coil is short-circuited in a superconducting persistent mode during operation of the magnet system. An external power supply during operation supplies current to the first magnet coil via a current lead thereby generating a first magnetic field at the sample location that fluctuates according to the current noise of the power supply, wherein the second magnet coil is positioned and dimensioned in a way that it inductively couples to the first magnet coil such that it generates at the sample location a second magnetic field that compensates the fluctuations of the first magnetic field. | 03-06-2014 |
20140121114 | SELF-SHIELD OPEN MAGNETIC RESONANCE IMAGING SUPERCONDUCTING MAGNET - A self-shield open magnetic resonance imaging superconducting magnet comprises five pairs of coils: shim coils, first main magnetic coils, second main magnetic coils, third main magnetic coils, and shielding coils. The five pairs of coils are symmetric about the center. The shim coils are arranged closest to the center point; the first main magnetic coils, the second main magnetic coils, the third main magnetic coils, and the shielding coils are arranged in sequence outside. The first main magnetic coils are connected with reverse current. The second and third main magnetic coils are connected with positive current for providing the main magnetic field strength. The shim coils are connected with positive current for compensating the magnetic field in the central region. The shielding coils are connected with reverse current for creating a magnetic field opposite to the main magnetic field for compensating the stray magnetic field in the space. | 05-01-2014 |
20140128267 | OPEN-TYPE NUCLEAR MAGNETIC RESONANCE MAGNET SYSTEM HAVING AN IRON RING MEMBER - An open type nuclear magnetic resonance magnet system having an iron ring member. A superconducting coil and a superconducting switch form a closed-loop current circuit to generate a magnetic field. The generated magnetic field gains a magnetic flux circuit and executes magnetic field shielding through upper and lower iron yokes and a lateral iron yoke. The magnet system generates a desired magnetic field in a magnet imaging central area via the superconducting coil. To balance the extremely high electromagnetic force between the superconducting coil and the upper and lower iron yokes, an annular iron ring is mounted in a space defined by an inner perimeter wall of in a cryogenic container. The magnetic field distribution between the superconducting coil and the upper and lower iron yokes is changed via the iron ring, so that the electromagnetic interaction force therebetween is reduced. | 05-08-2014 |
20140155268 | SYSTEM AND APPARATUS FOR COMPENSATING FOR MAGNETIC FIELD DISTORTION IN AN MRI SYSTEM - A magnet apparatus for a magnetic resonance imaging system, the magnet apparatus includes a cylindrical vacuum vessel, a closed loop cooling system disposed within the vacuum vessel and a cylindrical thermal shield disposed between the vacuum vessel and the closed loop cooling system. A set of passive compensation coils are disposed within the vacuum vessel and used to compensate for magnetic field distortion caused by mechanical vibrations within the magnet apparatus. | 06-05-2014 |
20140171329 | MRI APPARATUS, OPERATION METHOD THEREOF, AND QUENCHING PREVENTION DEVICE - In order to prevent quenching caused accidentally in a superconducting magnet, an MRI apparatus vibrates the superconducting magnet in order to prevent quenching of the superconducting magnet in a time period for which a predetermined imaging sequence is not executed (step | 06-19-2014 |
20140235448 | METHOD AND APPARATUS FOR COMPENSATING FOR DRIFT IN MAGNETIC FIELD STRENGTH IN SUPERCONDUCTING MAGNETS - An MRI system has a cylindrical superconducting magnet assembly contained in a bore tube of a cylindrical vacuum vessel (OVC), and a gradient coil assembly situated within the OVC bore tube. In an imaging region within a bore of the gradient coil assembly, the magnet assembly produces a magnetic field that is subject to drift during operation of the MRI system. Compensating material is located at a radial position between the imaging region and the magnet in a location that will be heated over a range of temperatures during operation of the MRI system. The compensating material is adjustable between two magnetic phases in response to an applied physical characteristic, which is selectively applied thereto so as to change the compensating material from a first magnetization to a second magnetization, and thereby compensate the drift. | 08-21-2014 |
20140243205 | VERY EFFICIENT HEAT EXCHANGER FOR CRYOGEN FREE MRI MAGNET - A heat exchanger ( | 08-28-2014 |
20140249033 | DC SQUID BASED RF MAGNETOMETER OPERATING AT A BANDWIDTH OF 200 MHZ AND HIGHER - An RF DC SQUID based magnetometer capable of sensing coherent magnetic fields up to 200 MHz and higher is developed which overcomes frequency limitations associated with noise signals due to transmission line delays between the SQUID circuit and readout electronics. The bandwidth limitations are overcome by superimposing the RF flux on the modulation flux to produce at the SQUID output a binary phase modulated RF voltage, which is processed to lock the static flux, and to control modulation regime by producing an AC bias for the RF flux. RF readout electronics based on a double lock-in technique (sequential demodulation of the RF SQUID voltage at the modulation flux frequency ω | 09-04-2014 |
20140274721 | FORCE-COMPENSATED GRADIENT COIL - A cylindrical superconducting magnet system for use in magnetic resonance imaging has axially aligned primary superconducting coils that are situated within an outer vacuum chamber (OVC). A thermal radiation shield surrounds the primary superconducting coils within the OVC. A primary gradient coil assembly is axially aligned with the primary superconducting coils and is situated radially within the primary superconducting coils. The cylindrical superconducting magnetic system also includes a secondary gradient coil assembly, that is radially situated outside of the primary superconducting coils and that is mechanically attached to the primary gradient coil assembly. | 09-18-2014 |
20140296074 | Superconducting Magnet and Nuclear Magnetic Resonance Device - There is provided a superconducting magnet in which magnetization caused by a shielding current of a superconducting winding is eliminated whereby the current to be supplied to the superconducting winding is uniformized, and thus uniformity of the central magnetic field is secured. The superconducting magnet has a superconducting winding composed of a superconductor, and an outer AC winding composed of a superconductor or non-superconductor wound coaxially with the superconducting winding, at an outer side the superconducting winding; and an AC current is supplied to the outer AC winding thereby applying an AC magnetic field in a direction perpendicular to a direction of magnetization caused in the superconducting winding by the shielding current, and thus the magnetization is eliminated. Also, the superconducting magnet has an inner AC winding composed of a superconductor or non-superconductor wound coaxially with the superconducting winding, at an inner side of the superconducting winding layer. | 10-02-2014 |
20140329688 | SUPERCONDUCTING ELECTROMAGNET DEVICE, COOLING METHOD THEREFOR, AND MAGNETIC RESONANCE IMAGING DEVICE - A superconducting magnet device is configured to include: a refrigerant circulation flowpath in which a refrigerant (R) circulates; a refrigerator for cooling vapor of the refrigerant (R) in the refrigerant circulation flowpath; a superconducting coil cooled by the circulating refrigerant (R); a protective resistor thermally contacting the superconducting coil and having an internal space (S); a high-boiling-point refrigerant supply section for supplying a high-boiling-point refrigerant having a higher boiling point than the refrigerant (R) and frozen by the refrigerant (R) to the internal space (S) in the protective resistor; and a vacuum insulating container for at least accommodating the refrigerant circulation flowpath, the superconducting coil, and the protective resistor. | 11-06-2014 |
20150045226 | AUTOMATIC CURRENT SWITCHING OF CURRENT LEADS FOR SUPERCONDUCTING MAGNETS - The invention provides for magnetic resonance imaging system ( | 02-12-2015 |
20150111751 | CRYOPROBE USING CLOSED GAS LOOP FOR NUCLEAR MAGNETIC RESONANCE APPARATUS - Provided is a cryoprobe using a closed gas loop for a nuclear magnetic resonance apparatus, including: superconducting magnets providing a magnetic field; a rotor rotatably disposed between the superconducting magnets in the state of a sample being put therein, the rotor being rotated by a driving gas; a coil configured to generate a nuclear magnetic resonance spectrum according to a resonance phenomenon of the sample by applying a radio frequency to the rotor; and a gas loop configured to cool the driving gas in a cryogenic condition while circulating it in a closed-loop condition and to supply the driving gas to the rotor, wherein the gas loop supplies the driving gas to the rotor while cooling it in a cryogenic condition, thereby rotating the rotor. | 04-23-2015 |
20150332829 | CRYOGENIC COOLING SYSTEM - A cryogen cooling system to cool a superconducting magnet is disclosed herein utilizing embedded vertical tubing with a large heat exchanging surface area. The tubing encompasses the magnet which is further surrounded by a 4 Kelvin thermal shield for extended ride-through. In one embodiment, the system is a hyperpolarizer having an internal high-pressure gas storage for quench gas and to initiate cool-down. Aspects of the invention utilize a minimal volume of pressurized gas, for example, four (4) liters of pressurized gaseous helium in a 150 mL liquid helium system. As such, the prior vent stack has been removed, along with the helium vessel and quench paths/ducts. The method of using the system is further simplified during ramping while the cool-down process utilizing liquids supplied from external dewars has been eliminated. Significant advantages include reducing the helium volume (and cost associated therewith) and allowing for a hermetically sealed vacuum system that is leak-proof. | 11-19-2015 |
20150340858 | SYSTEM AND METHOD FOR QUENCH PROTECTION OF A CRYO-FREE SUPER CONDUCTING MAGNET - A system including a first sealed housing with a first pressure and a second sealed housing with a second pressure. The first pressure is higher than the second pressure. The first sealed housing contains a predetermined gas and the second sealed housing contains a superconducting magnet. A sensor within the second housing monitors a voltage of parts of the magnet. When a processor determines a quenching event as a function of the monitored voltage, the processor actuates a valve that sealably connects the first and second housings. When the valve is in a first position, the first and second housings are sealed off from each other. When the valve is in a second position, the predetermined gas flows from the first housing into the second housing until a third pressure within the second housing is reached. The system can be used for protecting a cryo-free superconducting magnet. | 11-26-2015 |
20150346296 | METHOD AND MAGNETIC RESONANCE APPARATUS WITH A COOLING SYSTEM TO COOL A SUPERCONDUCTING BASIC MAGNETIC FIELD COIL - A magnetic resonance apparatus has a magnet unit that includes at least one superconducting basic magnetic field coil, a magnet housing unit surrounding the at least one superconducting basic magnetic field coil, a cooling system that has at least one cooling loop and a heat absorption unit to cool the at least one superconducting basic magnetic coil, and an additional unit. The cooling system has a switching unit with at least one first cooling mode, and the switching unit couples the at least one cooling loop of the cooling system with the additional unit for a heat exchange in the first cooling mode. | 12-03-2015 |
20150348689 | Superconducting Magnet System for Head Imaging - A superconducting magnet system for head imaging is disclosed which includes a cryocooler, a high-pressure helium container, a self-excitation heat pipe and a superconducting magnet. A second stage coldhead of the cryocooler is connected to the high-pressure helium container for converting the helium gas in the high-pressure helium container into liquid helium. The self-excitation heat pipe forms a closed cooling loop, and liquid helium in the high-pressure helium container flows circularly in the self-excitation heat pipe. The self-excitation heat pipe cools the superconducting magnet, wherein part of the liquid helium in the self-excitation heat pipe is converted into the helium gas due to the heat disturbance generated by the superconducting magnet, and the helium gas interacts with the liquid helium to generate liquid helium vibration. | 12-03-2015 |
20150369885 | SUPERCONDUCTING MAGNETIC FIELD GENERATING DEVICE, SUPERCONDUCTING MAGNETIC FIELD GENERATING METHOD, AND NUCLEAR MAGNETIC RESONANCE APPARATUS - A superconducting magnetic field generating device includes: a superconductor including an outer superconductor formed with a high temperature superconducting material in a cylindrical shape and generating a trapped magnetic field, and an inner superconductor formed with a high temperature superconducting material in a cylindrical shape and coaxially disposed with the outer superconductor on the inner circumferential side; and a cooling device cooling the outer and inner superconductors to a temperature equal to or lower than the superconducting transition temperature, wherein the inner superconductor is formed so that a ratio (Jcθ | 12-24-2015 |
20160041240 | REDUCED -GAS-FLOW ELECTRICAL LEADS FOR SUPERCONDUCTING MAGNET SYSTEM - A device is employed for an apparatus including an electrically conductive coil ( | 02-11-2016 |
20160116555 | Superconducting Magnet, MRI Apparatus and NMR Apparatus - Provided superconducting magnet allowing the temperature of the permanent current switch to be quickly lowered and the excitation time of the superconducting magnet to be shortened, an MRI apparatus and an NMR apparatus having the superconducting magnet. A superconducting magnet structure is disclosed in which a superconducting coil | 04-28-2016 |
20160178716 | SYSTEM AND METHOD FOR COOLING A MAGNETIC RESONANCE IMAGING DEVICE | 06-23-2016 |
20160189841 | COOLING SYSTEM AND METHOD FOR A MAGNETIC RESONANCE IMAGING DEVICE - A cooling system for a low-cryogen superconducting magnet includes a primary cooling loop having a liquid reservoir containing a supply of liquid cryogen and a plurality of cooling tubes fluidly coupled to the liquid reservoir and in thermal communication with the superconducting magnet. The liquid cryogen is configured for circulation through the cooling tubes for providing primary cooling for the magnet for cooling the magnet to a target temperature. The cooling system also includes a thermal battery coupled to a component that is cooled to the target temperature by the primary cooling loop and is configured to be cooled by the primary cooling and to absorb heat from the at least one component during an interruption in the primary cooling to maintain the magnet at approximately the target temperature. | 06-30-2016 |