Bruker Biospin Gmbh

Bruker Eas Gmbh

Bruker Hts Gmbh

Forschungszentrum Karlsruhe Gmbh

Klaus Schlenga

Alexander Usoskin

Gerhard Roth

Bernd Sailer

Manfred Thoener

Vital Abaecherli

Matheus Wanior

Volker Niemann

Carl Buehler

Arne Kasten

André Aubele

Volker Gluecklich

Felicitas Tenbrink

Robert Schauwecker

Pierre-Alain Bovier

Wolfgang Frantz

Michael Field

Andreas Szulczyk

Andreas Amann

Marion Klaeser

Thomas Arndt

Thorsten Greeb

Claus Hanebeck

Roland Binger

Carl BÜHLER

Manfred THÖNER

Vital ABÄCHERLI

Volker Glücklich

A monofilament () for producing an NbSn-containing superconductor wire () includes a powder core () with an Sn-containing powder, a reaction tube () composed of an Nb alloy that includes Nb and at least one further alloy component X. The powder core is disposed within the reaction tube. The monofilament also includes at least one source () for at least one partner component Pk. A respective source includes one or more source structures at a unitary radial position in the monofilament. The alloy component X and the partner component Pk form precipitates XPk on reaction annealing of the monofilament in which Sn from the powder core and Nb from the reaction tube react to produce NbSn. The powder core is disposed in a moderation tube, which in turn is disposed within the reaction tube. This provides a monofilament for a powder-in-tube based NbSn-containing superconductor wire with improved current carrying capacity.

Monofilament for producing an NbSn-containing superconductor wire, especially for internal oxidation

A subelement () for an NbSn-containing superconductor wire includes

Subelement based on Nb-containing rod elements with powder-filled core tube for an NbSn-containing superconductor wire, and associated production method

For producing an Nb3Sn superconductor wire, restack rod process (RRP) subelements () are grouped to form a bundle having an approximately circular cross section and are arranged together with filling elements (-) in an internally and externally round outer tube (). To the inside the filling elements form a serrated profile () for abutment against the hexagonal subelements, and to the outside they form a round profile () for direct or indirect abutment in the outer tube. In fabricating the RRP subelements, and before a reshaping with a reduction in cross section, an externally hexagonal and internally round casing structure () is provided, into which the remaining parts of the subelements are inserted, in particular, an annular arrangement of hexagonal Nb-containing rod elements (), which are surrounded externally by an outer matrix () and internally by an inner matrix ().

Finished conductor arrangement for an NB3SN superconductor wire and method for producing a subelement for an NB3SN superconductor wire

A method for producing an at least two-part structure, such as a semifinished product for a superconducting wire is provided. A first structure and a second structure are separately produced, and the first structure and the second structure are then inserted one into the other. The first structure and the second structure are respectively produced in layers by selective laser melting or selective electron beam melting of a powder. The method produces two-part structures for semifinished products of superconducting wires.

Method for producing an at least two-part structure, in particular a semifinished product for a superconducting wire

A method for producing a semifinished product for a superconducting wire is provided herein. The semifinished product includes at least one NbTi-containing structure, such as a NbTi-containing rod structure. The NbTi-containing structure may be produced in layers by selective laser melting or selective electron beam melting of a powder that contains Nb and Ti. In the production of at least some layers of the NbTi-containing structure, during the production of an irradiated area provided for a material deposition of a respective layer, at least one process parameter of the selective laser melting or electron beam melting is varied in one or a plurality of first zones of the irradiated area as compared to one or a plurality of second zones of the irradiated area. The present techniques simplify introduction of artificial pinning centers into the NbTi-material of a superconducting wire or a semifinished product for such a superconducting wire.

Method for producing a semifinished product for a superconducting wire

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 semi-finished wire () for a NbSn superconducting wire () has a multiplicity of elements containing Nb packed against each other (). The elements containing Nb () each have a rod containing Nb () and an enclosure containing Cu () surrounding the latter. The semi-finished wire also has a structure containing Sn () and a matrix containing Cu () in which the structure containing Sn () is disposed and on and/or in which the elements containing Nb () are disposed. The enclosures containing Cu () of the elements containing Nb (), contain Sn. The semi-finished wire is suitable for manufacturing an NbSn superconducting wire with which further improved superconducting current-carrying capacity is achieved.

Semi-finished wire for a Nb3Sn superconducting wire

An inductive fault current limiter () has a normally conducting primary coil assembly () with a multiplicity of turns () and a superconducting, short-circuited secondary coil assembly (), wherein the primary coil assembly () and the secondary coil assembly () are at least substantially coaxial with respect to each other and at least partially interleaved in each other. The primary coil assembly () has a first coil section () and a second coil section (), wherein the turns () of the first coil section () of the primary coil assembly () are disposed radially inside the secondary coil assembly () and the turns () of the second coil section () of the primary coil assembly () are disposed radially outside the secondary coil assembly (). The fault current limiter has an increased inductance ratio.

Inductive fault current limiter with divided primary coil configuration

A superconducting structure () has a plurality of linked band-segments (), with each linked band-segment () having a substrate () and a superconducting layer deposited onto it (). The linked band-segments () are joined to one another by superconducting layers () that face each other. Each linked band-segment () is joined to two additional band-segments () in such a way that the superconducting layers () of the two additional band-segments () and of the linked band-segment () face each other. The additional band-segments () together substantially overlap the total length (L) of the linked band-segment (). This provides for a superconducting structure, which exhibits high superconductivity and which is very suitable for long distances.

Superconducting structure having linked band-segments which are each overlapped by directly sequential additional band-segments

An inductive fault current limiter (), has a normally conducting primary coil assembly () with a multiplicity of turns (), and a superconducting, short-circuited secondary coil assembly (). The primary coil assembly () and the secondary coil assembly () are disposed at least substantially coaxially with respect to each other and at least partially interleaved in each other. The secondary coil assembly () has a first coil section () disposed radially inside the turns () of the primary coil assembly () and a second coil section () disposed radially outside the turns () of the primary coil assembly (). The fault current limiter has an increased inductance ratio.

Inductive fault current limiter with divided secondary coil configuration

A method for superconductingly connecting two or more wires (), each comprising at least one filament (-) that contains MgBor a mixture of Mg and B, wherein a superconducting connection is realized through exposed end regions () of the filaments (-) via an MgBmatrix, is characterized in that a bulk boron powder () is provided into which the exposed end regions () of the filaments (-) of the wires () project, the boron of the bulk boron powder () being present in amorphous modification. The bulk powder () is then compacted together with the projecting exposed end regions () of the filaments () to form a compressed element () and the compressed element () is infiltrated with molten magnesium () from the surface () of the compressed element (). The method improves the quality, in particular, the current-carrying capacity and the critical magnetic field strength of a superconducting connection of MgBsuperconducting wires.

Method for superconducting connection between MgB2 superconducting wires via a MgB2 matrix made from a boron powder compressed element infiltrated with Mg

A high temperature superconductor (=HTS) coated conductor (), comprising an HTS layer () deposited epitaxially on a substrate (), wherein the HTS layer () exhibits a lattice with a specific crystal axis being oriented perpendicular to the substrate plane (SP), in particular wherein the HTS layer material is of ReBCO type and the c-axis (c) is oriented perpendicular to the substrate plane (SP), wherein the HIS layer () comprises particle inclusions (), in particular wherein the particle inclusions () may be used to introduce pinning of magnetic flux, is characterized in that at least a part () of the particle inclusions () are formed of the same material as the HTS layer (), and/or of chemical fractions of the material of the HTS layer (), such that the average stoichiometry of said part () of the particle inclusions () corresponds to the stoichiometry of the HTS layer (), and that the particle inclusions of said part () are discontinuities of the lattice of the HTS layer (). A more simple method for producing a HTS coated conductor with reduced losses, and with improved critical current and critical magnetic field is thereby provided.

HTS coated conductor with particle inclusions, and method of production of an HTS coated conductor

A method for connecting two or more superconducting wires (), each comprising at least one filament (-) that contains MgB, wherein the superconducting connection is realized through exposed end regions () of the filaments (-) via a superconducting matrix, is characterized in that a bulk powder () of a high-temperature superconductor (HTS) powder with a transition temperature of T&#x3e;40K is provided, into which the exposed end regions () of the filaments (-) project, wherein the Boron of the Boron powder of the bulk powder () is in amorphous modification, and the bulk powder () is compacted together with the projecting exposed end regions () of the filaments (-) to form a compressed element (). The method improves the quality, in particular, the current carrying capacity and the critical magnetic field strength of a superconducting connection of two MgBwires.

Superconducting connection between MgB2 superconducting wires via a compressed element made from HTS powder

Disclosed herein are superconducting composites, and preliminary products therefor, having a core comprising a superconducting phase, a first casing surrounding the core, and having an inner area abutting the core and having a first magnesium concentration and an outer area having a second magnesium concentration greater than the first magnesium concentration, wherein the second magnesium concentration is, on average, between 5 and 40 atomic percent. Desirably, the superconducting phase comprises a MgBphase. This arrangement allows for methods for producing the composites that reduce or eliminate subjecting the superconducting phase to mechanical stresses.

Superconducting composite, preliminary product of superconducting composite and method for producing same

A superconducting magnet system with a superconducting magnet coil system disposed in a cryogenic fluid tank () of a cryostat (), and a refrigerator () for cooling the cryogenic fluid that cools the magnet, is characterized in that a radiation shield () is provided which separates a refrigerator space () from the cryogenic fluid tank (), wherein the entire cooling region () of the refrigerator () is disposed in the refrigerator space (), and wherein the radiation shield () has openings () for gas or fluid exchange between the refrigerator space () and the cryogenic fluid tank (). Should the refrigerator fail, the thermal input into the cryostat is reduced, and the safety of the maintenance staff is improved in case of a quench.

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Linkenheim-Hochstetten, Germany

Klaus Schlenga