| 摘要 |
A superconducting magnet coil system comprising a main field coil which is formed from series-connected sections, wherein the conductors of the radially inner sections contain a first superconducting material and have first electric voltage insulation, the conductors of the radially outer sections comprise a second superconducting material and are provided with second electric voltage insulation, wherein the first superconducting material has a higher critical magnetic field than the second superconducting material, and the first voltage insulation has a smaller dielectric strength than the second voltage insulation, and a shielding coil which is connected in series with the main field coil, radially surrounds the main field coil, and comprises conductors of the second superconducting material having the second electric voltage insulation, wherein the main field coil and the shielding coil are superconductingly short-circuited during operation and are protected through several ohmic resistances and/or diodes in case of a quench, is characterized in that the inner sections are protected by at least one ohmic resistance and the outer sections are protected, together with the shielding coil, by one single ohmic resistance.
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