| 摘要 |
In an arrangement for adjusting the spatial dependence of a magnetic field in a working volume of a main field magnet ( 19 ) by means of ferromagnetic field shaping elements ( 16 ), the field shaping elements ( 16 ) are formed from foils ( 1, 5, 7, 8 ) and/or sheet metals ( 10 ) having openings ( 2, 3 ) whose shape, position and size are selected such that the shape and the amount of the remaining ferromagnetic material produces a desired spatial dependence of the magnetic field in the working volume of the main field magnet for appropriate positioning of the foils ( 1, 5, 7, 8 ) and/or sheet metals ( 10 ) relative to the working volume of the main field magnet.
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