The superconducting magnet assembly with hysteresenfreier field coil

Magnet assembly for generating a magnetic field in the direction of az axis in a working on the z axis about z = 0 arranged working volume (V) with a magnet coil system (A, A ', A' ', A' '') comprising one or more includes superconducting magnet partial coil systems (A1, A1 ', A1' ', A1' '', A2 '' ', ..., An' ''), which form each superconductingly short-circuited during operation current paths and can be loaded with a further coil system (C, C ', C' ', C' '') which is independent of the magnet coil system (A, A ', A' ', A' '') or discharged, and comprising a first and comprises a second partial coil system (C1, C2, C1 'C2', C1 '', C2 '', C1 '' ', C2' ''), wherein the first partial coil system (C1, C1 ', C1' ', C1' ' ') and the second partial coil system (C2, C2', C2 '', C2 '' ') each comprise at least one coil, wherein all of the coils of the further coil system (C, C', C '', C '' ') to each other in series are connected, wherein g eff, diamag / C> 0.1 mT / A, characterized in that ...