Abstract
A Bi-2212 oxide superconducting magnet has been cooled down to temperatures around 20 K employing a Gifford-McMahon (G-M) cryocooler. An a.c. magnetic field with a peak value of 0.44T is stably generated at frequencies up to 0.25Hz (0T → 0.44T → 0T, 4s per cycle) at ≈ 20K. The a.c. loss characteristics arising in the magnet are presented. The expected potential of the magnet for a.c. operation with a higher peak magnetic field is also discussed in terms of a.c. loss behaviour.
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