Aktiv abgeschirmte supraleitende Magnetanordnung mit Z2-Shim

摘要

Radial inner and outer coil systems (M1,M2) have equal current and large dipole moment. A shim coil system corrects magnetic field non-homogeneity in an operating volume with a z component varying proportionally at z<2>. The shim coil system has a radial inner (Si) and outer (Sa) shim coil set each decoupled inductively by a magnetic device and each creating a magnetic field in the operating volume, the inner with a z component varying as DELTA H0+c2.z2 with c2=const. and the outer with a DELTA H0 magnetic field.