Sections (A1,A2,...An) of current paths (P1,P2,P3) short-circuited by superconducting switches (S1,S2,S3) are shunted by resistors (R1,R2,...,Rn). These sections and the resistors are selected such that the magnetic field disturbance in the volume of operation is reduced compared to the long-term residual amount, immediately after it occurs, the reduction being less than 20 per cent of the external magnetic field disturbance. The magnetic field disturbance is subsequently monotonically approximated to the residual amount of less than 20 per cent of the external magnetic field disturbance, using a time constant tau greater than or equal to 2 sec, preferably approximately equal to 20 sec. An Independent claim is included for a method of determining and optimising a magnet arrangement.
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