Abstract
A large GdBaCuO superconducting bulk 65 mm in diameter has been magnetized by a two-stage pulse field magnetization method named as a modified multi-pulse technique with stepwise cooling (MMPSC). The trapped field B T P of 3.0 T was achieved at the bulk center at 40 K by optimizing the trapped field profile at the first stage of the MMPSC method, on which the maximum B T P was as low as 1.9 T at 40 K for the single pulsed field application. A magnetic gradient along the radius direction larger than that estimated by a Bean’s model is realized at the ascending stage of the magnetic pulse field at the second stage, and a large amount of magnetic fluxes staying at the bulk periphery flow to the bulk center at the descending stage.
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