| 摘要 |
A superconducting magnet configuration with a magnet coil ( 1 ) of inductance L which is disposed in a cryostat ( 7 ) at a cryogenic temperature, for generating a temporally stable magnetic field, in a working volume, which is suitable for NMR measurements, and with current feed lines to an external current source ( 3 ) via which a current of a current strength I<SUB>PS </SUB>can be supplied, wherein, at a cryogenic temperature, the magnet coil ( 1 ) can be exclusively short-circuited via a switch ( 5 ), is characterized in that the switch ( 5 ) is normally conducting and comprises a mechanically operable bridge ( 6 ) with an ohmic resistance R 1 which can be predetermined. The inventive magnet configuration ensures straightforward stable permanent operation via a mains supply even at high currents (>1000A) and also effective discharge of the energy released during a quench.
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