Bruker Biospin Gmbh

Bruker Analytische Messtechnik Gmbh

Other

Bruker Analytik Gmbh

Bruker Daltonik Gmbh

Bruker Analytic

Forschungszentrum Karlsruhe Gmbh

Bruker Axs Gmbh

Spectrospin Ag

Broker Axs, Inc.

Karlsruher Institut Fur Technologie

Arne Kasten

Gerhard Roth

Gunther R Laukien

Michael Westphal

Tony W Keller

Gunter Laukien

Jochen Franzen

Klaus Schlenga

Rene Jeker

Paul Vincent

Daniel Marek

Alexander Usoskin

Dieter Schmalbein

Wolfgang H Muller

Reinhard Biehl

Andreas Kamlowski

Pawel Grybos

Anton Kuster

Arjen B Storm

Lutz Bruegemann

Leendert J Seijbel

Gijsbertus J Kerpershoek

Gisela Guthausen

Ekkehard Gerndt

Theo Schneider

Rachel Eisenhower

Tschopp Werner

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 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.

Magnet system for generation of a highly stable magnetic field

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 cryostat () with a magnet coil system including superconductors for the production of a magnet field Bin a measuring volume () within a room temperature bore () of the cryostat has a plurality of radially nested solenoid-shaped coil sections () which surround the room temperature bore 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 LTS section () is located in a helium tank () of the cryostat () along with liquid helium at a helium temperature T. The apparatus is characterized in that the HTS section () is disposed radially within the LTS section () in a vacuum portion of the cryostat and is separated from the LTS section () by the helium tank () wall () facing the room temperature bore. The HTS coil section can be reliably used in the cryostat over a long period of time (FIG.).

Cryostat having a magnet coil system, which comprises an LTS section and an HTS section, which is arranged in the vacuum part

A method and an apparatus serve the purpose of determining the fat or oil content of a sample. The sample is dried under the action of a microwave field and is examined under the action of a radio-frequency signal and of a constant magnetic field by means of nuclear magnetic resonance. The sample is exposed to the microwave field, the radio-frequency signal and the magnetic field at the same measuring place in a common measuring chamber. The apparatus has a microwave source for drying the sample, a magnetic system for generating a nuclear magnetic resonance magnetic field in the sample, and a nuclear magnetic resonance measuring arrangement for irradiating radio-frequency signals into the sample and for receiving excited nuclear magnetic resonance signals from the sample. The microwave source, the magnetic system and the nuclear magnetic resonance measuring arrangement are connected to a common measuring chamber in which the sample is located.

Method and apparatus for determining the fat or oil content of a sample

An X-ray analysis device makes use of a variable aperture for controlling the position and cross section of the X-ray beam. The variable aperture is configured to allow changes in the cross section and/or position of the beam by movement of one aperture component in one direction. In one embodiment, the aperture medium is a perforated disk that is rotated to expose different aperture holes to the beam. In another embodiment, the aperture medium is a perforated tape that is moved in a linear direction to expose different aperture holes to the beam. The tape may be wound about two axes to control its movement, or may be a continuous loop. A cassette may also be used to house the tape.

Analytical instrument with variable apertures for radiation beam

An X-ray or neutron-optical analysis device comprising means for directing radiation from a source () onto a sample (), and a detector () with n substantially identical detector elements (D) which are disposed parallel, next to each other in a first direction x and which extend in strips in a second direction y, wherein i=, . . . n, for one-dimensional spatially-resolved detection of radiation reflected, scattered or diffracted by the sample () onto the detector (), and with a detection electronics for processing the detector signals of the n detector elements (D), wherein the detection electronics can reliably process a maximum radiation intensity per detector element (D) without overloading, is characterized in that an optical element is disposed in front of the detector () which covers or weakens radiation incident on the surfaces of the respective n detector elements (D) in correspondence with a predetermined, non-constant transmission function f(x) and/or the optical element comprises a collimator () which can be displaced along the strip direction y. The inventive analysis device permits artificial enlargement of the dynamic range of the detector ().

Analysis device with variably illuminated strip detector

A magnet system of a magnetic resonance apparatus for generating a magnetic field which is homogeneous and temporally highly stable within a volume under investigation and which extends along a z-axis, with a superconducting magnet coil () which is disposed in a cryostat () and with a periodically operated refrigerator () having a magnetic regenerator material which is disposed in a regenerator housing () within the cryostat () in the stray field of the magnet coil (), and which is provided with a device () for shielding or compensating a magnetic disturbing field in the volume under investigation generated by the periodic operation of the refrigerator () due to regenerator magnetization changes is characterized in that the regenerator housing () is surrounded by a compensation coil arrangement () which can be superconductingly short-circuited and which is made from a plurality of conductor loops () which are separately short-circuited during measurement to keep a plurality of magnetic fluxes through these conductor loops () constant in the superconductingly short-circuited state. A magnet system of this type facilitates effective compensation of the disturbing fields caused by a magnetic regenerator material at the location of the volume under investigation.

Magnet system with shielded regenerator housing

The system describes a means and a method for stabilizing the magnetic field generated in the measuring volume of a high-resolution magnetic resonance spectrometer having an actively shielded magnet coil () which is located in a cryostat () and which is superconductingly short-circuited. The system comprises a compensation coil () which is decoupled from the magnet coil (), and is disposed on the shielding coil () of the magnet coil ().

Superconducting magnet system with drift compensation

The invention concerns a superconducting high-field magnet system () for a high-resolution magnetic resonance spectrometer, comprising a magnet coil () which is superconductingly short-circuited during operation, and generates a homogeneous temporally stable magnetic field during operation that meets the requirements for taking a high-resolution magnetic resonance spectrum. The magnet coil () comprises an LTS partial coil () and an HTS partial coil (). The LTS partial coil () can be separately short-circuited in a pure LTS circuit () via an LTS switch (), and the HTS partial coil () can be separately short-circuited in a pure HTS circuit () via an HTS switch () and both partial coils () are connected via an LTS-HTS joint () and are charged by the same power supply.

Low drift superconducting high field magnet system

A description is given of a method for determining the content of a first component of a sample, which first component provides a first NMR signal and has a first self-diffusion coefficient D, the sample additionally containing at least one further component which provides a further NMR signal and has a larger self-diffusion coefficient D, in particular for determining the fat content of a hydrous sample, with the aid of a low-resolution nuclear magnetic resonance (NMR) pulse spectrometer, the sample being excited by a radio-frequency (RF) excitation pulse and being exposed to a magnetic gradient field and to a sequence of further refocusing RF pulses for generating spin echo signals, the spin echo signals being detected and their amplitude values being determined, from which a value for the content of the first component of the sample is determined. The magnetic gradient field is not switched off during the sequence of further refocusing RF pulses.

Method and apparatus for determining the fat content

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.

NMR high field magnet coil system with superconducting capability and having an outwardly protruding inner coil section

The invention concerns a means and a method for stabilizing a magnetic field generated by a superconductingly short-circuited main coil located in a cryostat in the measuring volume of a high-resolution magnetic resonance spectrometer, which comprises compensation coils which are dimensioned and positioned such that they, in their entirety, are suited to largely compensate for field drifts of the superconductingly short-circuited main coil in the measuring volume. The drift compensation coils consist of HTS material and are disposed radially outside of the main coil at a higher temperature level.

Superconducting magnet system

A superconducting very high field magnet coil with several solenoidal multi-layer coil sections which are wound in layers onto a hollow cylindrical support body ( ) about a common central axis a, and which are electrically connected in series to carry a current in excess of 100 A is characterized in that the radially innermost coil section ( ) comprises superconducting wire ( ) which contains oxidic, high temperature superconductor (HTS) material, wherein the layers of the radially innermost coil section ( ) are helically wound such that there is a free axial space between the walls, which is then sealed. The corresponding production method comprises the steps of helically winding a layer of superconducting HTS wire together with a filler wire onto the support body; removing the filler wire from the support body; repeating steps (a) and (b) until a desired number of layers of the coil section is obtained; thermally treating the winding packet for reacting the HTS material under a gaseous atmosphere containing O with optimized annealing parameters; and sealing the hollow spaces of the coil section. This permits production of an NMR-capable solenoid coil having only a few superconducting joints, of topologically simple construction that can carry a current of a few hundred amperes and which contains HTS material to produce magnetic fields in excess of 21 Tesla.

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Karlsruhe, Germany

Arne Kasten