Bruker Biospin Gmbh

Bruker Biospin Gmbh & Co. Kg

Gerald Neuberth

Michael Westphal

Gerhard Roth

Marco Strobel

Wolfgang Frantz

Rafael Caminada

The invention relates to a superconducting magnet coil system comprising a first electrical mesh (M) and a second electrical mesh (M), which are interconnected in series with one another, wherein the first electrical mesh (M) comprises in a first path an HTS (high temperature superconductor) coil section (A) and, in series therewith, a first main coil section (A) and in a second path a quench protection element (Q), which bridges the series connection of HTS coil section (A) and first main coil section (A). The first main coil section (A) comprises a conductor comprising superconducting filaments in a matrix. The second electrical mesh (M) comprises a neighbouring main coil section (A) comprising a conductor comprising superconducting filaments in a matrix. The neighbouring main coil section (A) is that main coil section of an electrical mesh different from the first electrical mesh which, in a radial direction outwards, lies closest to the first main coil section (A) of the first electrical mesh. The magnet coil system is characterized in that, in the case of a quench, the conductors of the main coil sections (A, A, A) each generate a specific power input (LT/2π)*1/ρ, wherein the specific power input of the conductor of the first main coil section (A) of the first electrical mesh (M) is higher than the specific power input of the conductor of the neighbouring main coil section (A) of the second electrical mesh (M). Consequently, using HTS superconductor material, it is possible to provide a magnet coil system with which particularly high field strengths can be generated and/or which has a small structural size.

Superconducting magnet coil system

A superconducting high-field magnet coil system comprising several radially nested main coil sections () which are connected to each other in series in such a fashion that currents of the same direction flow through them during operation, wherein a first main coil section (EHS) is disposed radially further inward than a second main coil section (ZHS) and at least one intermediate main coil section (ZW) is disposed radially between the first and the second main coil section (EHS, ZHS), and with a superconducting switch () via which all main coil sections () can be superconductingly short-circuited in series, is characterized in that the first main coil section (EHS) and the second main coil section (ZHS) are directly successively series-connected and the first main coil section (EHS) and the second main coil section (ZHS) are bridged by a common quench protection element, which does not bridge the at least one intermediate main coil section (ZW). The magnet coil system realizes quench protection for selectively preventing excess currents in magnet coil areas in which the excessive mechanical force load associated with an excess current would damage the superconductor.

Superconducting magnet coil system with quench protection for the prevention of excessive localized currents

A superconducting magnet configuration () for generating a homogeneous magnetic field Bin an examination volume (), has an interior radial superconducting main field coil () which is disposed rotationally symmetrically about an axis (z-axis) and an oppositely driven coaxial radially exterior superconducting shielding coil () is characterized in that the magnet configuration () consists of the main field coil (), the shielding coil (), a ferromagnetic field formation device () and a ferromagnetic shielding body (AK), wherein the ferromagnetic field formation device () is located at the radially inside of the main field coil () and the ferromagnetic shielding device (AK) surrounds the main field coil () and the shielding coil () in a radial and axial direction, the main field coil () consisting of an unstructured solenoid coil or of several radially nested unstructured solenoid coils () which are driven in the same direction, the axial extent Lof the shielding coil () being smaller than the axial extent Lof the main field coil (), wherein the axial magnetic field profile () generated by the main field coil () and the shielding coil () during operation has a minimum of the field strength along the axis (z-axis) in the center () and a maximum of the field strength on each side of the center (), and wherein the axial magnetic field profile () generated by the ferromagnetic field formation device () and the ferromagnetic shielding body (AK) during operation has a maximum of the field strength along the axis (z-axis) in the center () and a minimum of the field strength on each side of the center (). The magnet configuration in accordance with the invention has a very simple structure.

Compact superconducting magnet configuration with active shielding having a shielding coil contributing to field formation

An actively shielded superconducting magnet configuration (M; M; M) for generating a homogeneous magnetic field Bin a volume under investigation () has a radially inner superconducting main field coil () which is disposed rotationally symmetrically about an axis (z axis) and a coaxial radially outer superconducting shielding coil () which is operated in an opposite direction. The magnet configuration consists of the main field coil, the shielding coil and a ferromagnetic field-shaping device (), wherein the ferromagnetic field-shaping device is disposed radially inside the main field coil. The main field coil consists of an unstructured solenoid coil or of several radially nested unstructured solenoid coils () which are operated in the same direction. An extension Lof the shielding coil in the axial direction is smaller than the extension Lof the main field coil in the axial direction. applies for the axial magnetic field profile B(z) generated by the main field coil and the shielding coil during operation along the z-axis in the center at z=0 and applies for the axial magnetic field profile B(z) generated by the ferromagnetic field-shaping device () during operation along the z-axis in the center at z=0, wherein the z-axis is oriented in a positive direction of the B-field. An actively shielded superconducting magnet configuration of considerably simplified structure is thereby provided with a homogeneous and particularly high magnetic field Bin the volume under investigation.

Compact superconducting magnet configuration with active shielding, wherein the shielding coil damps the field maximum of the main coil as well as associated magnetic resonance tomograph, NMR spectrometer and ion cyclotron resonance mass spectrometer

A superconducting magnet configuration () for generating a homogeneous magnetic field Bin an examination volume (), has an interior radial superconducting main field coil () which is disposed rotationally symmetrically about an axis (z-axis) and an oppositely driven coaxial radially exterior superconducting shielding coil () is characterized in that the magnet configuration () consists of the main field coil (), the shielding coil (), and a ferromagnetic field formation device (), wherein the ferromagnetic field formation device () is located at the radially inside of the main field coil (), the main field coil () consisting of an unstructured solenoid coil or of several radially nested unstructured solenoid coils () which are driven in the same direction, the axial extent Lof the shielding coil () being smaller than the axial extent Lof the main field coil (), wherein the axial magnetic field profile () generated by the main field coil () and the shielding coil () during operation has a minimum of the field strength along the axis (z-axis) in the center () and a maximum of the field strength on each side of the center (), and wherein the axial magnetic field profile () generated by the ferromagnetic field formation device () during operation has a maximum of the field strength along the axis (z-axis) in the center () and a minimum of the field strength on each side of the center (). The magnet configuration in accordance with the invention has a very simple structure.

In an arrangement for adjusting the spatial dependence of a magnetic field in a working volume of a main field magnet () by means of ferromagnetic field shaping elements (), the field shaping elements () are formed from foils () and/or sheet metals () having openings () 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 () and/or sheet metals () relative to the working volume of the main field magnet.

Integral passive shim system for a magnetic resonance apparatus

A magnet coil arrangement comprising an actively shielded superconducting primary circuit ( ) comprising first and second magnet windings ( and ), and being wound e.g. in winding chambers ( and ) in a supporting body ( ) for generating a strong magnetic field in a working volume with a small magnetic stray field and a short circuited secondary circuit ( ) which is inductively coupled with the primary circuit ( ) and contains third and fourth magnet windings ( and ) is characterized in that the magnet windings ( and ) of the secondary circuit ( ) form an actively shielded magnet coil. This permits a simple and robust coil protection for actively shielded superconducting magnets during a quench wherein the superconducting magnet windings are reliably relieved and the magnetic stray field of the entire arrangement remains small.

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Bruchsal, Germany

Gerald Neuberth