The invention concerns a method for charging an actively shielded magnet coil
arrangement (20) comprising a first partial region (21) which can
be superconductingly short-circuited using an additional switch (23), and
a second partial region (22), wherein the two partial regions (21, 22)
generate dipole moments of different signs. The magnetic fringe field B* is measured
close to the desired operating state of the arrangement (20) and operating
currents are determined for each of the two partial regions (21, 22) at
which the overall magnetic field B is free from an additional dipole moment caused
by production tolerances to permit setting of the theoretically optimum fringe
field, irrespective of production tolerances. These operating currents are adjusted
taking into consideration the inductive coupling between the partial regions (21,
22) through initially charging the entire magnet coil arrangement (20)
and, after closing the additional switch (23), through continuation of the
charging process in the second partial region (22) only. This eliminates
deviations, which are caused by production tolerances, from the optimum theoretical
fringe field of the arrangement (20) in a simple and inexpensive manner.