Patent ID: 8390289

Claim:
A permanent magnet assembly for generating an NMR compatible homogeneous permanent magnetic field, comprising: permanent solid cylindrical main magnets disposed on a common cylindrical axis, each solid cylindrical permanent main magnet including a planar magnet pole surface; the planar magnet pole surfaces of the permanent solid cylindrical main magnets being parallel and spaced apart from each other to define an interspace on opposed sides of the magnet pole surfaces of a volume between 0.0005 cm 3 and 200 cm 3 ; the opposed sides of the magnet pole surfaces respectively having an opposite magnetic polarization; a plurality of permanent magnets positioned relative to each other to surround an inner chamber; and the plurality of permanent magnets surrounding the permanent solid cylindrical main magnets so that the inner chamber at least partially encloses the interspace and lines of flux of magnetic fields of the permanent solid cylindrical main magnets and the plurality of permanent magnets are constructively superimposed and additive at least inside the interspace to form the NMR compatible homogeneous permanent magnetic field.