Siemens Aktiengesellschaft

Nexans

Siemens Corporation

Siemens Aktiengesell Schaft

Florian Steinmeyer

Michael Zwanger

Markus Vester

Joerg Roland

Peter Van Hasselt

Günter Ries

Andrew Dewdney

Steffen Elschner

Mark O Rikel

Keith White

Jürgen Ehrenberg

G&uuml;nter Ries

Simon Krämer

Hans-Peter Kramer

Carla Brigitte Trautenberg, Legal Representative

Ulrich Trautenberg, Legal Representative

Elke Trautenberg, Legal Representative

A multilayer superconducting wirewith essentially round cross sectional area where the outer surface of the round wire is provided with a high temperature superconductor layerand where at least the high temperature superconductor layeris fabricated as a spiral running along the length of the superconductor wirein parallel lanes

Superconducting wire with low AC losses

The present invention relates to a cryostat having a service neck for access to a superconducting magnet. In many cryogenic applications components, e.g. superconducting coils for magnetic resonance imaging (MRI), superconducting transformers, generators, electronics, are cooled by keeping them in contact with a volume of liquefied, the whole cryogenic assembly being known as a cryostat. In order to operate a superconducting magnet, it must be kept at a temperature below its superconducting transition temperature. A cryostat must provide access to the vessel containing the liquefied helium for the initial cooling of the magnet to its low operating temperature, for periodic refilling of systems where there is a loss of helium, and provide sufficient access whereby to enable operation and maintenance of the magnet. The present invention seeks to provide an access neck to a cryostat such as helium vessel with a minimum heat load and accordingly provides a cryostat assembly, wherein a service neck comprising at least one positive and one negative current lead is arranged such that one of the leads is formed by the neck tube wall and the space between a neck tube wall and the second current lead forms a gas path for venting and/or filling or other services.

Current lead quenching assembly

A high-temperature superconductor fault current limiter elements () of standardized modular design and a high-temperature superconductor fault current limiter unit to protect an electrical application such as power network from damage in case of fault event.

Superconducting resistive fault current limiter

In a medical device with at least one transducer fashioned for generation of high-intensity focused ultrasound and with a magnetic resonance apparatus as well as associated ultrasound transducer, and method for generation of magnetic resonance exposures, at least one shim element is associated with the transducer for compensation of a susceptibility difference caused by the design of the transducer with regard to the transducer environment.

Method, transducer, and arrangement for HIFU treatment with MR temperature monitoring

In a method and device for determination of a position shift, first image data of a body region of a treatment-positioned patient that contain derivable temperature information are acquired. A focal area in the body region is determined, and the focus of a hyperthermia applicator can be aligned on the focal area. Second image data of the body region of the treatment-positioned patient that contain derivable temperature information are acquired, and a position shift of the focal area is determined by a comparison of the second image data with the first image data.

Method and device to determine a position shift of a focal area

In a method and device for correction of a B0 field drift in a temperature map acquisition by magnetic resonance tomography, a fluctuation measurement is calculated per pixel from a number of magnetic resonance tomography phase images of an examination subject or from temperature maps derived therefrom. Using this fluctuation measurement, pixels of the phase images or temperature maps with low fluctuation are determined, and corresponding pixels of a phase image to be corrected or of a temperature map to be corrected are selected using the pixels determined as having low fluctuation. The phase image to be corrected or the temperature map to be corrected is adjusted to a reference phase image or a reference temperature map such that the selected pixels of the phase image to be corrected or of the temperature map to be corrected are calibrated to corresponding pixels of the reference phase image or of the reference temperature map.

Magnetic resonance tomography method and apparatus for correcting drift of the B0 field in a temperature map

A device for implementation and monitoring of thermal ablation has a device for generation of high intensity ultrasound and a magnetic resonance system for generation of examination images composed of voxels that contain temperature information. The geometry of the voxels is adapted to the shape of the ultrasound focus.

Device for implementation and monitoring of thermal ablation and associated method

A device for supplying electric energy to at least one superconductor, with the superconductor being cooled in a cooled region to at least one predetermined temperature for achieving superconductivity, includes at least one electric energy source, and a transformer for transferring electric energy between the at least one energy source and the superconductor. The transformer has a primary winding electrically connected with the energy source and a secondary winding electrically connected with the superconductor, wherein at least the secondary winding of the transformer is arranged within the cooled region.

Rotary transformer for supplying electric power to a superconducting rotor

In a method for assessing ambient conditions of an installation site of a magnetic resonance imaging device, various places in an area surrounding the installation site are examined by means of a detection unit for changes in a test magnetic field and the ambient conditions are determined from the results of the examination. The detection unit includes a magnetic field generator and a magnetic field sensor.

Method and device for assessing ambient conditions of an installation site of a magnetic resonance imaging device

The supraconductor device contains a rotor, which can rotate about a rotational axis, with a supraconductive coil in a heat conducting coil support. The coil support comprises a central cylindrical cavity. A cooling head, which is located outside of the rotor, of a cooling unit is connected in a heat conductive manner to a heat transfer body, which projects into the cavity of the coil support while remaining stationary. An annular gap located between the coil support and the heat transfer body is filled with a heat conducting contact gas.

Superconducting device comprising a cooling unit for cooling a rotating, superconductive coil

The superconducting device has a rotor which is rotatable about an axis of rotation and is provided with a superconductive winding in a heat conducting winding carrier. The winding carrier has a central cooling agent cavity with a lateral cavity leading out of the winding carrier connected thereto. A cold head associated with a cooling unit is connected to a condenser unit which condenses the cooling agent. A fixed heat tube guiding the cooling agent is coupled to the condenser unit, protruding axially into the coorotating lateral cavity and is sealed in relation thereto.

Superconducting device with a cooling-unit cold head thermally coupled to a rotating superconductive winding

A device includes a flux pump and an electromagnet to be fed thereby for the production of highly constant magnetic fields of high field strength. In a flux pump of the rectifier type, switches used are MOSFETs. These MOSFETs include HTsuperconductor material at operating temperatures. Preferably, the flux pump and a coil of the electromagnet are arranged in one and the same cryostat housing.

Flux pump with a superconductor and superconducting electromagnet to be operated therewith

A magnetic bearing includes at least one inner bearing part; at least one outer bearing part which surrounds the inner bearing part; at least one permanent magnet and at least one flux guiding element which is positioned axially in relation to a rotation axis, adjacent to the permanent magnet(s), for guiding the magnetic flux of the permanent magnet(s) to one of the two bearing parts, and at least one superconductor on the other of the two bearing parts. The permanent magnet(s) and superconductor interact with each other in such a way that a bearing gap is formed around the rotation axis between the inner bearing part and the outer bearing part. The permanent magnent(s) is/are radially set back towards the bearing gap in relation to the flux guiding element(s) in a radial direction, perpendicular to the rotation axis. Each permanent magnet is held at least one of inwards and outwards by a corresponding radial holding element, at least on the facing towards the bearing gap.

Magnetic bearing

At temperatures located in a cryogenic temperature range, nickel steel is used for components, which can be subjected to high levels of mechanical stress and which have ferromagnetic properties at these temperatures.

Device including component, which is ferromagnetic in cryogenic temperature range and can be subjected to mechanical loads

The device comprises a) a rotor which can rotate or rotates about a rotational axis and b) at least one magnetic suspension bearing, in which the rotor can be or is mounted in a contactless manner and which comprises at least one super-conductive structure in addition to several permanent magnets, and c) a cooling device comprising at least one refrigeration head for cooling the super-conductive structure of the or each magnetic suspension bearing, whereby d) the rotor and each magnetic suspension bearing are arranged in a common gas chamber, which is surrounded by a gas-proof wall. The advantage of the device is that ice is prevented from forming on the magnetic suspension bearing.

Growing community of inventors

Herzogenaurach, Germany

Florian Steinmeyer