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A magnet assembly comprising a superconducting magnet coil system and a magnetic field shaping apparatus for magnetic resonance spectroscopy
A magnet assembly comprising a superconducting magnet coil system and a magnetic field shaping apparatus for magnetic resonance spectroscopy
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机译：一种磁体组件，包括超导磁体线圈系统和用于磁共振波谱学的磁场整形设备
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摘要
A magnet arrangement for use in an apparatus for magnetic resonance spectroscopy with a superconducting magnetic coil system (C) for generating a magnetic field in the direction of a z-axis in a working volume (AV) arranged around z = 0, the field of the magnetic coil system in the working volume having at least an inhomogeneous proportion An0 · zn with n ≥ 2, whose contribution to the total field strength on the z-axis varies by z = 0 with the nth power of z, and wherein a field-forming device (P1) made of magnetic material is provided which is cylindrically symmetrical with respect to the z-axis , which is at least partially a radial distance from the z-axis of less than 80 millimeters and compensates for at least 50% of the inhomogeneous field components An0 · zn of the magnetic coil system, is characterized in that one or more non-cylindrically symmetrical recesses are provided in the field shaping device are provided, which are designed so that at least one coefficient t Note or Bnm with m ≠ 0 in the magnetic field development of the magnet arrangement according to spherical functions is reduced in amount by at least 50%. The field homogeneity in the working volume can thus be increased significantly simply and without increasing the volume of the magnet arrangement, only a few iterations being required to optimize the magnet arrangement.
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