Abstract: 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 (3) which is disposed in a cryostat (1) and with a periodically operated refrigerator (2) having a magnetic regenerator material which is disposed in a regenerator housing (5) within the cryostat (1) in the stray field of the magnet coil (3), and which is provided with a device (4) for shielding or compensating a magnetic disturbing field in the volume under investigation generated by the periodic operation of the refrigerator (2) due to regenerator magnetization changes is characterized in that the regenerator housing (5) is surrounded by a compensation coil arrangement (4) which can be superconductingly short-circuited and which is made from a plurality of conductor loops (6, 7a, 7b) which are separately short-circuited during measurement to keep a plurality of magnetic flux

Abstract: A method of forming buried bit line DRAM circuitry includes collectively forming a buried bit line forming trench, bit line vias extending from the bit line forming trench, and memory array storage node vias within a dielectric mass using only two masking steps. Conductive material is simultaneously deposited to within the buried bit line forming trench, the bit line vias, and the memory storage node vias within the dielectric mass. Other aspects and implementations are contemplated.

Abstract: A flat multi-layer arrangement (1; 1a–1f) of superconducting wires (4,5) with normally conducting substrate (17) and at least one fiber (16) which is electrically conductingly connected to the substrate (17) and is superconducting under predetermined operating conditions is characterized in that the superconducting wires (4, 5) in a respective layer (2, 3; 22, 23) are substantially disposed such that they do not cross. A resistive electric contact is provided between the superconducting wires (4, 5) of different layers (2,3; 22, 23) and the superconducting wires (4, 5) of at least two neighboring layers (2, 3; 22, 23) do cross, wherein no closed superconducting loops are present in the arrangement (1; 1a–1f). This arrangement permits shielding of the working volume of a magnet coil arrangement against low-frequency stray fields in an efficient and reliable manner.

Abstract: 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 (4) which is located in a cryostat (2) and which is superconductingly short-circuited. The system comprises a compensation coil (12) which is decoupled from the magnet coil (4), and is disposed on the shielding coil (4b) of the magnet coil (4).

Abstract: A superconducting magnet configuration with a magnet coil (1) of inductance L which is disposed in a cryostat (7) at a cryogenic temperature, for generating a temporally stable magnetic field, in a working volume, which is suitable for NMR measurements, and with current feed lines to an external current source (3) via which a current of a current strength IPS can be supplied, wherein, at a cryogenic temperature, the magnet coil (1) can be exclusively short-circuited via a switch (5), is characterized in that the switch (5) is normally conducting and comprises a mechanically operable bridge (6) with an ohmic resistance R1 which can be predetermined. The inventive magnet configuration ensures straightforward stable permanent operation via a mains supply even at high currents (>1000A) and also effective discharge of the energy released during a quench.

Abstract: An actively shielded superconducting magnet coil system (1) for generating a magnetic field in a working volume (6), which is rotationally symmetric about a z-axis, comprising a radially inner main field winding (5) and a radially outer shielding winding (7), and an electrically highly conductive shielding cylinder (radially inner shielding cylinder) (8a/8b) which is disposed radially inside the main field winding (5) or between main field winding (5) and the shielding winding (7) is characterized in that at least one further electrically highly conductive shielding cylinder (9) is disposed radially outside the shielding winding (7). The inventive magnet coil system prevents generation of a fringe field flash in the outer region of the magnet coil system in case of a quench.

Abstract: A co-axial magnet configuration for the production of a magnetic field and investigational volume which is suitable for measurement of magnetic resonance has at least one superconducting solenoid coil or solenoid coils which are radially nested within each other, wherein the windings of the solenoid coil(s) in a radial region about the axis of the magnetic configuration are disposed between r1 and r2, wherein r1<r2 is characterized in that the windings are surrounded by at least one rotationally symmetric magnet body made from ferromagnetic material which extends over a radial region between r3 and r4 wherein r3<r4 wherein r2<r3<1.3 r2 and r4>1.

Abstract: A method of forming buried bit line DRAM circuitry includes collectively forming a buried bit line forming trench, bit line vias extending from the bit line forming trench, and memory array storage node vias within a dielectric mass using only two masking steps. Conductive material is simultaneously deposited to within the buried bit line forming trench, the bit line vias, and the memory storage node vias within the dielectric mass. Other aspects and implementations are contemplated.

Abstract: 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 (3) which is disposed in a cryostat (1) and with a periodically operated refrigerator (2) having a magnetic regenerator material which is disposed in a regenerator housing (5) within the cryostat (1) in the stray field of the magnet coil (3), and which is provided with a device (4) for shielding or compensating a magnetic disturbing field in the volume under investigation generated by the periodic operation of the refrigerator (2) due to regenerator magnetization changes is characterized in that the regenerator housing (5) is surrounded by a compensation coil arrangement (4) which can be superconductingly short-circuited and which is made from a plurality of conductor loops (6, 7a, 7b) which are separately short-circuited during measurement to keep a plurality of magnetic flux

Abstract: 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 (4) which is located in a cryostat (2) and which is superconductingly short-circuited. The system comprises a compensation coil (12) which is decoupled from the magnet coil (4), and is disposed on the shielding coil (4b) of the magnet coil (4).

Abstract: A flat multi-layer arrangement (1; 1a-1f) of superconducting wires (4,5) with normally conducting substrate (17) and at least one fiber (16) which is electrically conductingly connected to the substrate (17) and is superconducting under predetermined operating conditions is characterized in that the superconducting wires (4, 5) in a respective layer (2, 3; 22, 23) are substantially disposed such that they do not cross. A resistive electric contact is provided between the superconducting wires (4, 5) of different layers (2,3; 22, 23) and the superconducting wires (4, 5) of at least two neighboring layers (2, 3; 22, 23) do cross, wherein no closed superconducting loops are present in the arrangement (1; 1a-1f). This arrangement permits shielding of the working volume of a magnet coil arrangement against low-frequency stray fields in an efficient and reliable manner.

Abstract: An actively shielded superconducting magnet coil system (1) for generating a magnetic field in a working volume (6), which is rotationally symmetric about a z-axis, comprising a radially inner main field winding (5) and a radially outer shielding winding (7), and an electrically highly conductive shielding cylinder (radially inner shielding cylinder) (8a/8b) which is disposed radially inside the main field winding (5) or between main field winding (5) and the shielding winding (7) is characterized in that at least one further electrically highly conductive shielding cylinder (9) is disposed radially outside the shielding winding (7). The inventive magnet coil system prevents generation of a fringe field flash in the outer region of the magnet coil system in case of a quench.

Abstract: In a magnetic resonance (MR) apparatus comprising a main field magnet system with a tubular opening for receiving the object to be investigated and at least one tubular mechanically oscillatory component, disposed in this opening, in particular a gradient coil system, and at least one cylindrical element of electrically conducting material surrounded by the main field magnet system, which is rigidly mechanically connected to at least one of the mechanically oscillatory components or forms an integral mechanical component thereof, the sum of the products p of the electric conductivities &sgr;, the cylinder radii R and the wall thicknesses d of the cylindrical element per mechanically oscillatory component is between 1 Am/V and 10,000 Am/V, preferably between 10 Am/V and 1000 Am/V, and particularly preferred between 20 Am/V and 500 Am/V. This produces good noise damping in an inward direction.

Abstract: A main field magnet arrangement for a one-sided magnet resonance device produces a homogeneous magnetic field B in a working volume (4). The working volume (4) and the main field magnet (1) are disposed on different sides of a plane E and the main field magnet (1) has a geometric shape which permits disposal of a radio frequency (RF) receiver coil system and optionally a gradient coil system on the same side of the plane E as the main field magnet (1). Field-generating elements of permanent-magnetic material form a radially outer part (2) and a radially inner part (3) relative to an axis A extending through the center of the working volume (4), wherein the surface, facing the working volume (4), of the radially inner part (3) is axially further spaced apart from the center of the working volume (4) than the surface of the radially outer part (2) facing the working volume (4), such that a depression (5) is formed in the radially inner part (3) in the axial direction.

Abstract: The magnetic field in the working volume of an apparatus for measuring the magnetic resonance, in particular nuclear magnetic resonance, is homogenized in that shim plates are disposed at predetermined positions about the working volume and, in sum, do not generate a field in the center of the working volume. The summed effect of the shims is preferably inductively decoupled from the coil generating the magnetic field.

Abstract: A magnet coil arrangement comprising an actively shielded superconducting primary circuit (21) comprising first and second magnet windings (1,2,3 and 4,5), and being wound e.g. in winding chambers (7,8,9 and 10,11) in a supporting body (6a,6b) for generating a strong magnetic field in a working volume with a small magnetic stray field and a short circuited secondary circuit (22) which is inductively coupled with the primary circuit (21) and contains third and fourth magnet windings (13,14,15 and 16,17) is characterized in that the magnet windings (13,14,15 and 16,17) of the secondary circuit (22) 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.

Abstract: A main field magnet arrangement for a one-sided magnet resonance device produces a homogeneous magnetic field B in a working volume (4). The working volume (4) and the main field magnet (1) are disposed on different sides of a plane E and the main field magnet (1) has a geometric shape which permits disposal of a radio frequency (RF) receiver coil system and optionally a gradient coil system on the same side of the plane E as the main field magnet (1). Field-generating elements of permanent-magnetic material form a radially outer part (2) and a radially inner part (3) relative to an axis A extending through the center of the working volume (4), wherein the surface, facing the working volume (4), of the radially inner part (3) is axially further spaced apart from the center of the working volume (4) than the surface of the radially outer part (2) facing the working volume (4), such that a depression (5) is formed in the radially inner part (3) in the axial direction.

Abstract: The invention concerns a gradient system of a magnetic resonance apparatus comprising an additional, rigidly mechanically coupled highly conductive shielding cylinder which dampens excitation of mechanical vibrations of the apparatus during gradient switching.

Abstract: A gradient coil system comprises a gradient coil for generating a rapidly changing magnetic gradient field in a working volume of a magnetic resonance apparatus, with a current path guided in windings on the surface of a geometric body, the geometry of which results in the desired spatial dependence of the magnetic field of this gradient coil in the working volume. N current power supplies (NG1, NG2) can be controlled with an analog or digital control signal to each generate a time-dependent controlled electric current (i1, i2) proportional to the control signal. The current path is divided into several parallel conductor paths which are electrically insulated from one another, and which form a doubly or multiply wound transformer, wherein the inductances of the various conductor paths with respect to one another as well as the mutual inductances with respect to one another have approximately the same value L.

Abstract: In a magnetic resonance (MR) apparatus comprising a main field magnet system with a tubular opening for receiving the object to be investigated and at least one tubular mechanically oscillatory component, disposed in this opening, in particular a gradient coil system, and at least one cylindrical element of electrically conducting material surrounded by the main field magnet system, which is rigidly mechanically connected to at least one of the mechanically oscillatory components or forms an integral mechanical component thereof, the sum of the products p of the electric conductivities &sgr;, the cylinder radii R and the wall thicknesses d of the cylindrical element per mechanically oscillatory component is between 1 Am/V and 10,000 Am/V, preferably between 10 Am/V and 1000 Am/V, and particularly preferred between 20 Am/V and 500 Am/V. This produces good noise damping in an inward direction.