Abstract
A Bi 2Sr 2Ca 1Cu 2O x superconducting solenoidal coil with a persistent current switch (PCS) has been newly designed and fabricated, for the first time as a superconductively jointed oxide superconducting coil. The operation behaviour of the solenoidal coil at 4.2 K has been evaluated when the PCS is off or on. When the PCS was off, the solenoidal coil worked well, generating magnetic fields of over 95% of the designed value. After the PCS was turned on, a magnetic field of about 100 gauss was continuously generated for 100 h and then the PCS was turned off. The residual resistance of the entire circuit was estimated to be below 1.6 × 10 −11 Ω from the last 1900 min (= 31.7 h) of operation. This resistance value reaches the practical level of commercial metallic superconducting magnets used for magnetic resonance spectroscopy, being operated in the persistent current mode. This work has proved that the Bi-2212 solenoidal coil has great potential for practical use with persistent current mode operation.
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