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The field component vs the radial coordinate, , in the distance of from the coil: at (gray lines), measured at coil currents of 6, 5, 4, 3, 2, 1, 0.5, and (from the top to the bottom), at (black lines), measured at the same coil currents. (●) calculated values at assuming uniform current distribution. Inset: the winding geometry.
The maximum of the radial field component, , measured at for the full dc current waves . The dashed line shows the calculated values assuming the uniform current distribution. The rate of change for is . The inset shows the shape and hysteresis of the curves measured at 300 and . Note the change of the character of the hysteresis observed at and at small currents compared with that for the large current (the curve branch down is below the curve branch up).
Coil voltage measured vs coil current for triangular current waves with (●), (엯), and (◇).
The measured total ac losses of the YBCO and Cu coils as a function of the coil current at various frequencies from (bottom curve) up to (upper curve). The losses of Cu coil were measured with dc current (—) and with ac current at (- -) and (— —). The inset shows the coil voltage, , vs time measured at various current at .
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