Bruker Biospin Gmbh

Bruker Analytische Messtechnik Gmbh

Bruker Analytik Gmbh

Kernforschungszentrum Karlsruhe Gmbh

Forschungszentrum Karlsruhe Gmbh

Bruker Eas Gmbh

Karlsruher Institut Fur Technologie

Gerhard Roth

Arne Kasten

Klaus Schlenga

Volker Niemann

Wolfgang Frantz

Michael Westphal

Robert Schauwecker

Alexander Usoskin

Pierre-Alain Bovier

Patrick Wikus

Wolfgang H Muller

Marco Strobel

Andreas Amann

Gerald Neuberth

Steffen Bonn

Rene Jeker

Wolfgang Lehmann

Franz Graf

Peter Turowski

Klaus Goebel

Thorsten Greeb

Theo Schneider

Helmut Krauth

Roland Binger

Claus Hanebeck

Axel Lausch

Wolfgang Stautner

Werner Tschopp

Markus Jakob

Yuriy Ogol

A magnet coil system () has a first end section () of an HTSL-tape conductor () located ahead of a first end () of an HTSL-tape conductor () and a first end section () of an LTS wire () located prior to a first end () of the LTS wire () which are connected electrically but not in a superconducting way in a connecting section () along the length of the connecting section. The LTS wire () has a flat shape at least within the connecting section () and one side of the flat LTS wire () abutting the HTSL-tape conductor () and the connecting section () has a length of at least 5 m. The magnet coil system has an acceptably small residual ohmic resistance which is achieved by simple means.

Magnet coil assembly, comprising an HTS strip conductor and an LTS wire, which form a joint

An NMR spectrometer () with an NMR magnet coil () having windings of a conductor with a superconducting structure (), which have a plurality of band-segments (--) made of band-shaped superconductor. Each band-segment (--) has a flexible substrate () and a superconducting layer () deposited thereon, wherein the band-segments (--) each have a length of 20 m or more. At least one of the band-segments (--) forms a linked band-segment (), and each linked band-segment () is connected to at least two further band-segments (-) in such a way that the combined further band-segments (-) overlap with at least 95% of the total length (L) of the linked band-segment (). The magnet coil generates particularly high magnetic fields in a sample volume and has a low drift.

NMR spectrometer comprising a superconducting magnetic coil having windings composed of a superconductor structure having strip pieces chained together

A connecting device in a pulse tube cooler system branches such that a first line branch () has a first flexible line segment () and a second line branch () has a second flexible line segment (), the flexible line segments being arranged in parallel with and offset from one another. The flexible line segments each have a front segment end () and a rear segment end (), the front segment end () of the first flexible line segment () and the rear segment end () of the second flexible line segment () are rigidly connected to one another, the rear segment end () of the first flexible line segment () and the front segment end () of the second flexible line segment () are rigidly connected to one another, and there is no continuous rigid connection between the control valve and the cold head.

Pulse tube cooler system with force-compensated rotary valve line

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 cryostat () with a magnet coil system including superconductors for the production of a magnet field Bin a measuring volume () has a plurality of radically nested solenoid-shaped coil sections () and which are electrically connected in series, at least one of which being an LTS section () with a conventional low temperature superconductor (LTS) and at least one of which being an HTS section () including a high temperature superconductor (HTS), wherein the magnet coil system is located in a helium tank () of the cryostat () along with liquid helium at a helium temperature TK. The apparatus is characterized in that heating means are provided which always keep the HTS at an increased temperature T&#x3e;Tand T&#x3e;2.2 K. The cryostat in accordance with the invention can maintain the HTS section over a long period of time in a reliable manner.

Cryostat having a magnet coil system, which comprises an LTS section and a heatable HTS section

A cryostat () with a magnet coil system including superconductors for the production of a magnet field Bin a measuring volume () has a plurality of radially nested solenoid-shaped coil sections () which are electrically connected in series, at least one of which being an LTS section () with a conventional low temperature superconductor (LTS) and at least one of which being an HTS section () including a high temperature superconductor (HTS), wherein the LTS section () is located in a first helium tank () of the cryostat () along with liquid helium at a helium temperature T&#x3c;4 K. The apparatus is characterized in that the HTS section () is disposed radially within the LTS section (,) in a separate helium tank () of the cryostat () having normal liquid helium and is separated from the LTS section () by means of at least one wall disposed between the two helium tanks. An HTS coil section can be maintained in the cryostat in accordance with the invention over a long period of time and in a reliable fashion.

Cryostat having a magnet coil system, which comprises an under-cooled LTS section and an HTS section arranged in a separate helium tank

A winding machine () for winding solenoid-shaped coils () with band-shaped conductors (), comprising a winding means () which holds a circular-cylindrical coil core () of a coil () to be wound, and a winding drive which rotates a coil core (), which is held in the winding means (), about a winding axis W, wherein the winding means () can be moved in a first direction A by an axial drive, the direction A preferably extending approximately parallel to the winding axis W, is characterized in that the winding means () can be rotated about a pivot axis S by a pivot drive, wherein the pivot axis S extends perpendicularly to the direction A. The winding machine winds a solenoid-shaped coil with several layers of a band-shaped conductor without damaging the band-shaped conductor, in particular, when the band-shaped conductor contains brittle superconducting material.

Winding machine for winding solenoid shaped coils having band-shaped conductors

A superconductor element comprising NbSn, in particular, multi-filament wire, which contains at least one superconducting filament () which is obtained after drawing through solid diffusion reaction from an initial filament structure which comprises a longitudinal hollow tube () of niobium (Nb) or an Nb alloy, in particular, NbTa or NbTi, with an inner surface () and an outer surface (), wherein the tube () is embedded into a thermally and electrically highly conducting metal matrix (), in particular, of copper (Cu), wherein the tube () is filled with a material () which contains tin (Sn) is characterized in that, for mechanical reinforcement of the conductor element and as a diffusion barrier during solid diffusion reaction, the outer surface () of the tube () is directly and completely surrounded by a sleeve () made from a metallic material which has, at room temperature, a thermal expansion coefficient &#x3b1;&#x3c;17*10K, preferably &#x3b1;&#x3c;8*10K, an elastic limit R&#x3e;300 MPa and a cross-sectional reduction A&#x3e;20%, wherein the metallic material is selected to be chemically inert to diffusing tin (Sn) up to a reaction temperature T of the solid diffusion reaction.

Reinforced superconductor element

A superconducting magnet coil configuration comprising at least one section of a superconducting strip conductor, which is continuously wound in a cylindrical winding chamber () between two end flanges () in several solenoid-like layers is characterized in that the section comprises an axial region of reduced current density (=notch region ()), and the winding chamber () in the notch region () contains a first separating body () with a truncated conical envelope () which axially divides the winding chamber () into two partial chambers (), the superconducting strip conductor being guided over the truncated conical envelope () of the first separating body () from one partial chamber () into the other partial chamber () via a single-layer transfer winding (), and a second separating body () is provided which supplements the first separating body () in the notch region () in a radial outer direction to form a circular cylinder, wherein the single-layer transfer winding () is disposed between the separating bodies (). The inventive magnet coil configuration thereby realizes an HTS coil with a notch region for correcting inhomogeneities, wherein bending of the strip conductor through a small radius of curvature is not necessary.

Superconductor magnet coil configuration

A cryostat () with a first helium tank () which contains helium at an operating temperature T&#x3c;3K, and a second helium tank () which is connected to the first helium tank () and contains liquid helium at an operating temperature T&#x3e;3K, wherein a cooling means () is provided in the first helium tank () which generates an operating temperature T&#x3c;3K in the first helium tank (), wherein the cooling means () is designed as a Joule-Thomson valve with downstream heat exchanger from which pumped helium is transported to a room temperature region outside of the cryostat () is characterized in that a refrigerator () is provided whose cold end () projects into the second helium tank () and the supplied helium is returned during normal operation in a closed loop along the refrigerator () and into the second helium tank (), thereby being pre-cooled and liquefied at the cold end () of the refrigerator (). The inventive cryostat minimizes helium consumption, thereby permitting continuous measuring operation.

Superconducting magnet system with refrigerator

A superconducting magnet coil configuration comprising at least one section of a superconducting strip conductor, which is continuously wound in a cylindrical winding chamber () between two end flanges () in several solenoid-like layers is characterized in that the section comprises an axial region of reduced current density (=notch region ()), and the winding layers () have hollow cylindrical blind regions () which are filled with filler and which have different axial lengths, and radially sequential blind regions () each alternately abut one of the two end flanges () and are each radially separated from each other by at least one continuous winding layer (), wherein the axial overlapping region of the blind regions () forms the notch region (). The inventive device thereby realizes a magnet coil configuration comprising a strip conductor which has a notch region for correcting inhomogeneities, wherein the mechanical load on the strip conductor is minimized.

A superconducting magnet coil configuration has at least one section containing a superconducting strip conductor which is wound in several layers like a solenoid in a cylindrical winding chamber () between two end flanges (), characterized in that the radially innermost layers of the section consist of metallic low-temperature superconductors (LTS) (LTS layers ()) and radially adjacent layers of the section are formed from high-temperature superconductor (HTS) material (HTS layers ()). The invention proposes a magnet coil configuration using HTS material which has a notch structure for correcting inhomogeneities and homogenizing a compact high-field magnet, wherein the mechanical load on the HTS strip conductor is minimized.

A magnetic resonance apparatus comprising a superconducting magnet coil which is disposed in a cryostat, and a refrigerator for cooling the magnet coil, which comprises a compressor for compressing a working gas, and a high-pressure line and a low-pressure line between the compressor and a control valve, which periodically connects the high-pressure line and the low-pressure line to a connecting line from the control valve to a cold head of the refrigerator, thereby generating pressure pulses via the connected working gas, wherein the control valve is mechanically rigidly connected to the cryostat, is characterized in that one pressure reservoir is provided in the high-pressure line and/or in the low pressure line, which is mechanically rigidly connected to the cryostat and which is connected to the compressor via a mechanically flexible line section. This permits supply of a working gas to a cold head using a compressor in such a manner that the artifacts in the NMR signals caused by the pressure pulses of the working gas are minimized.

Magnetic resonance apparatus with pressure reservoir

NMR magnet coil system with separate superconducting short-circuited regions for drift compensation as well as method for operation thereof

The invention concerns an NMR (nuclear magnetic resonance) high field magnet coil system comprising superconducting conductor structures for generating a homogeneous magnetic field B in a measuring volume ( ) with several radially nested solenoidal coil sections ( ), which is characterized in that the radially innermost coil section ( ) is wound with a band-shaped superconductor with an aspect ratio (width to thickness) >3 on a coil support which axially projects, at least at one axial end, past the winding packet of the radially neighboring coil section ( ) and the band-shaped superconductor is guided on this side tangentially towards the outside to a region of reduced magnetic field strength and terminates in at least one electrical connecting point ( ). This permits use of a brittle band-shaped superconductor for the innermost coil system ( ) which cannot be strongly bent at the upper edge.

Growing community of inventors

Rheinstetten, Germany

Gerhard Roth