Abstract: 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 D1, the sample additionally containing at least one further component which provides a further NMR signal and has a larger self-diffusion coefficient D2, 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.

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 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 D1, the sample additionally containing at least one further component which provides a further NMR signal and has a larger self-diffusion coefficient D2, 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.

Abstract: The invention concerns an NMR (nuclear magnetic resonance) high field magnet coil system comprising superconducting conductor structures for generating a homogeneous magnetic field B0 in a measuring volume (23) with several radially nested solenoidal coil sections (12, 13, 31), which is characterized in that the radially innermost coil section (31) 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 (12) 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 (16). This permits use of a brittle band-shaped superconductor for the innermost coil system (31) which cannot be strongly bent at the upper edge.

Abstract: The invention concerns an NMR (nuclear magnetic resonance) high field magnet coil system comprising superconducting conductor structures for generating a homogeneous magnetic field B0 in a measuring volume (23) with several radially nested solenoidal coil sections (12, 13, 31), which is characterized in that the radially innermost coil section (31) 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 (12) 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 (16). This permits use of a brittle band-shaped superconductor for the innermost coil system (31) which cannot be strongly bent at the upper edge.

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.

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: The invention relates to methods and devices for the detection of ions in an RF quadrupole ion trap. The invention consists of integrating a detector, such as a secondary-electron multiplier, into the end cap electrode with form and potential fit, thereby avoiding the ion outlet holes in the end caps, which might otherwise lead to field disturbances. Ions that leave the field by mass-selective and mass-sequential ejection using one of the known scan methods are measured when they impact on the end cap electrode. Both positive and negative ions can be measured. In the case of positive ions, it is also possible to measure the ions that impact on the side opposite the detector by means of their secondary electrons.

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 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: 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.

Abstract: The invention relates to methods and devices for the detection of ions in an RF quadrupole ion trap. The invention consists of integrating a detector, such as a secondary-electron multiplier, into the end cap electrode with form and potential fit, thereby avoiding the ion outlet holes in the end caps, which might otherwise lead to field disturbances. Ions that leave the field by mass-selective and mass-sequential ejection using one of the known scan methods are measured when they impact on the end cap electrode. Both positive and negative ions can be measured. In the case of positive ions, it is also possible to measure the ions that impact on the side opposite the detector by means of their secondary electrons.

Abstract: The magnetic field in the working volume of an apparatus for the measurement of magnetic resonance, in particular nuclear magnetic resonance, is homogenized in that shim platelets are arranged in stacks in pre-calculated positions around the working volume and for a fine adjustment in the mounted state they are continuously displaced from these positions, preferably by means of piezo translators.

Abstract: The invention relates to quadrupole RF ion traps used in a mass spectrometer, either as storage elements or as mass separators for the measurement of the mass spectrum of stored ions. The invention particularly relates to ion traps, which should show a pure quadrupole field without superimpositions of higher multipoles or, on the other hand, a quadrupole field with superimposition of one or several higher multipole fields of a precisely defined intensity, but no others, particularly no higher multipole fields. The limitation of ring and end cap electrodes to finite dimensions induces components of higher multipole fields within the ion trap, which may cause negative influences on the storage and scanning behavior.

Abstract: A device for the safe discharge of a superconducting magnet coil (4) which is located inside a cryostat (2) and superconductively short-circuited by a superconducting switch (7) providing at or in the cryostat (2) a transmitter (10) of electromagnetic energy being located at a temperature level considerably above the cryogenic temperature of the superconducting magnet coil (4), which transmitter can be switched on quickly from outside, and by arranging in the region of the superconducting switch (7) at the cryogenic temperature level of the superconducting magnet coil (4) a receiver (20) for the emitted electromagnetic energy, which transmits the received energy directly or indirectly to a heating device (15) of the superconducting switch (7) or which activates an auxiliary energy source (41) in the region of the superconducting switch (7) , which on its turn effects a heating of the superconducting switch (7), so that it becomes normal-conducting and causes a discharge process of the superconducting magnet c

Abstract: The invention concerns a superconducting magnet configuration for a high resolution NMR spectrometer which is highly stable over time and having a cryostat (21) with a vertical room temperature bore (23). A transverse access (32) through the cryostat (21) to the room temperature bore (23) is provided for at an easily accessible height directly above the upper end of the superconducting magnet coil (25) to substantially simplify the introduction of a sample. In a system having two helium tanks (26, 27), it is advantageous to have the access (32) arranged between these helium tanks.

Abstract: In a superconducting magnet coil configuration, in particular for a high resolution analytical nuclear resonance (NMR) spectrometer, with a cryostat having extremely low heat losses (low loss), comprising at least one essentially cylindrical container (1) with a vertical cylinder axis (k), with a vertical cylindrical room temperature bore (3) and with at least one inner tank (4) for a cryogenic liquid in thermal contact with a superconducting magnet coil (2) enclosing the room temperature bore (3), for generating a vertically directed, extremely homogeneous and stable magnetic field of high field strength inside a measuring volume of the room temperature bore (3), the vertical axes (r) of the room temperature bore (3) and of the superconducting magnet coil (2) run parallel to and at a distance from the vertical cylinder axis (k) of at least one of the cylindrical cryostat containers (1). In this way, access to the room temperature bore (3) is considerably simplified.

Abstract: A device for the safe discharge of a superconducting magnet coil (4) which is located inside a cryostat (2) and superconductively short-circuited by a superconducting switch (7) providing at or in the cryostat (2) a transmitter (10) of electromagnetic energy being located at a temperature level considerably above the cryogenic temperature of the superconducting magnet coil (4), which transmitter can be switched on quickly from outside, and by arranging in the region of the superconducting switch (7) at the cryogenic temperature level of the superconducting magnet coil (4) a receiver (20) for the emitted electromagnetic energy, which transmits the received energy directly or indirectly to a heating device (15) of the superconducting switch (7) or which activates an auxiliary energy source (41) in the region of the superconducting switch (7), which on its turn effects a heating of the superconducting switch (7), so that it becomes normal-conducting and causes a discharge process of the superconducting magnet co

Abstract: An apparatus is disclosed for the propulsion of water vehicles. A magnet field as well as an electric field with essentially perpendicular field lines are produced in a pipe through which surrounding water flows. In this manner, a force is exercised upon charge carriers within the surrounding water and this force is used as a propulsion force for the water vehicle. The pipe is surrounded by a solenoid coil which is arranged essentially coaxially to the pipe. A first electrode is arranged essentially along the axis of the pipe and a voltage source is switched between the electrode and the pipe, acting as a second electrode. An Archimedes' screw is arranged in the cylindrical gap between the electrode and the pipe in order to deflect the surrounding water circulating about the axis into an axial direction, or the screw is rotationally rigidly connected to a moving conductor arranged perpendicularly to the direction of the magnet field.