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: The invention concerns an NMR sample holder for NMR samples with a short sample tube of constant diameter which is clamped in a largely gas-tight fashion and with a movable plunger and a rotor. The inventive device increases flexibility compared to conventional sample holders, reduces the vapor volume over the sample liquid in the sample tube and prevents deviations from precise orientation. The invention also concerns a method for simple and safe exchange of the sample tube thereby drastically minimizing loss through breakage.

Abstract: 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 (3) 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 (1) comprises superconducting wire (2) which contains oxidic, high temperature superconductor (HTS) material, wherein the layers of the radially innermost coil section (1) are helically wound such that there is a free axial space between the walls, which is then sealed.

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: 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.