| 摘要 |
A superconducting magnet arrangement with at least two current paths, short-circuited via switches in the operational state, which may 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 which carry approximately the same current and have dipole moments of approximately the same magnitude, but opposite in direction, such that an outer magnetic field disturbance in a working volume of the magnet arrangement in the long-term behavior is suppressed to a remaining value of less than 20% of the external magnetic field disturbance, is characterized in that sections of the superconducting current paths are disturbance, is characterized in that sections of the superconducting current paths are bridged by ohmic resistors and that said sections and the ohmic resistors are chosen such that the magnetic field disturbance in the working volume is reduced already directly after its occurrence with respect to the field shift remaining after a long time, and that subsequently, the magnetic field disturbance in the working volume approaches the said field shift monotonously with a time constant of &tgr;>=2 sec. In this manner, also the short-term behavior of such a magnet system is improved in case an external disturbance occurs and new ways for optimizing the dynamic disturbance behavior are shown which require relatively little technical expense.
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