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The Investigation of Sweeping Speed on the Magnetization of a 2 Inches Diameter \hbox {YBa}_{2}\hbox {Cu}_{3}\hbox {O}_{7 - \delta } Thin Film With the Circular-Type Magnetic Flux Pump

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9 Author(s)
Wang, W. ; Dept. of Eng., Univ. of Cambridge, Cambridge, UK ; Semerad, R. ; Spaven, F. ; Zhang, M.
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A circular-type magnetic flux pump (CTMFP) device was built to study the flux dynamics on a 2-inch-diameter YBCO thin film. This CTMFP is composed of two CTMFP coils, with each CTMFP coil containing concentric three-phase windings and a dc winding. We connected the three-phase windings to the output of a commercial inverter. By changing the output frequency of the inverter, the sweeping speed of the circular-shaped travelling magnetic wave can be changed. The connection of the phase coils follows the forward consequence, so that the circular-shaped travelling magnetic wave travels inward to the center. The output frequency f was changed from f = 0.01 to 1000.0 Hz. The YBCO sample was sandwiched between the two CTMFP coils to experience the circular-shaped travelling magnetic wave. It was found that the increase of the flux density in the center of the film is independent of the sweeping frequency. In high frequency f = 1000.0 Hz, even if the waveform had changed a lot, the increment is still the same as in low frequencies.

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Applied Superconductivity, IEEE Transactions on  (Volume:23 ,  Issue: 3 )