Patent ID: 6307370
Filing Date: 2001-10-23
Classification: G01R

Abstract:
Superconducting magnet arrangement with at least two current paths which are short-circuited during operation via superconducting switches, said current paths being able to carry different currents, wherein the magnet arrangement comprises at least one actively shielded superconducting magnet with a radially inner and a radially outer coil system carrying approximately the same current and having dipole moments of approximately the same magnitude, but opposite in direction, such that an external magnetic field disturbance in a working volume in the centre of the magnet arrangement is suppressed in long-term behavior to a remaining value of less than 20% of the external magnetic field disturbance, characterized in that sections of the current paths are bridged via ohmic resistors and that these sections and the ohmic resistors are chosen such that the magnetic field disturbance in the working volume is reduced immediately after its occurrence with respect to the remaining value in the long-term behaviour of less than 20% of the external magnetic field disturbance, and that subsequently, the magnetic field disturbance in the working volume approaches monotonously the remaining value of less than 20% of the external magnetic field shift with a time constant of .tau..gtoreq.2 sec.