Bruker Biospin Gmbh

Other

Lukas Haenichen

Rainer Pietig

Volker Niemann

Ion Prisecaru

William Jefferson Stone, Iii

An electron paramagnetic resonance (EPR) spectrometer includes a magnet system comprising at least one magnet and at least one pole piece for producing a magnetic field along a pole axis in a field of view in front of the at least one pole piece. A probe head comprising a microwave resonator and at least one modulation coil or rapid scan coil produces an additional, time-varying magnetic field aligned along the pole axis. The probe head is arranged in the field of view, and a respective modulation coil or rapid scan coil is arranged between the microwave resonator and a respective pole piece. For each pole piece, at least a part of said pole piece is made of a function material having an electric conductivity σof 10S/m or less, and having a saturation magnetic flux density BSof 0.2 T or more.

EPR spectrometer with at least one pole piece made at least partially of a function material

An adjustment apparatus for adjusting the angular tilt of a first component of a magnetic circuit relative to an alignment axis of a second component of the circuit uses at least one pair of spacers each of which has a thickness that changes continuously around its periphery. The spacers are arranged between the circuit components and, as a relative rotation between the spacers is changed, the combined thickness of the two spacers increases in one area, while decreasing in another. This results in a tilting of a top surface of the spacer pair relative to a bottom surface, and a corresponding change in a relative tilt of the first component relative to the second component. The spacers may be ring-shaped or disc-shaped, and allow for precise alignment of the magnetic circuit without the need for shims between the components.

Relative tilt angle adjustment system for magnetic components

A magnet arrangement having a hollow-cylindrical magnet element that has an axial length Land an inner radius R, is constructed from magnet segments arranged concentrically around the z-axis, and has a Halbach magnetization. At least one ring-shaped magnet element has a notched, hollow-cylindrical cutout extending circumferentially around the z-axis symmetrically with respect to the plane z=0, the axial extent Lof the cutout being less than the axial length Lof the magnet element. The cutout has a radial depth Tand an axial length L&#x3c;Lbetween the z-positions z=&#x2212;zto z=+z. The radial depth Tand the axial length Lof the cutout are to ensure that the remaining inhomogeneity of the homogenous magnetic field Bin a predefined measurement volume having an axial plateau length Lin the center of the magnet arrangement does not exceed 10 ppm.

Halbach magnet arrangement with notch

A magnet arrangement () having a permanent magnet system with at least two ring-shaped magnet elements () which are made of individual magnet segments (), are arranged cylindrically symmetrically and stacked on one another in the z direction and/or concentrically, and arranged such that the magnetization directions of the individual segments in the rings extend parallel in an x-y plane. The magnet elements align relative to one another in the z direction and have a Halbach magnetization Before final mounting in the magnetic resonance apparatus, the magnet elements are prefabricated as solid structures and their respective magnet segments are fixed undisplaceably relative to one another. But the magnet elements are displaceable relative to one another in the x-y plane, and are mounted rotatably and/or tiltably relative to one another.

Permanent magnet arrangement for MR apparatuses with axially and laterally displaceable, rotatably mounted ring modules

A magnetic resonance arrangement with a permanent magnet system and having magnet elements, pole piece elements and yoke elements of magnetic material arranged cylinder-symmetrically with respect to the z axis. The yoke elements have a first lid () and a second lid () and also a hollow cylindrical drum () arranged axially between the lids. The yoke elements enclose the measuring volume in the axial and radial direction. The magnet elements each include a pair of cylinder-symmetrical axial magnets () and also radial magnet rings (). The axial magnets are each arranged axially adjoining the lids and are arranged radially within the radial magnet rings and respectively axially further away from the measuring volume than the radial magnet rings. The outer diameter of the axial magnets is less than or equal to the inner diameter of the radial magnet rings.

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Karlsruhe, Germany

Lukas Haenichen