Loss Measurements on Twisted Multifilamentary Superconducting Wires

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Abstract
Measurements have been made on the energy losses produced during pulsed operation of several superconducting magnets. The coils were made from NbTi wires with solid and multifilamentary cores and pulsed to approximately 25 kG. A comparison was made between the losses produced in magnets made from the two types of conductor. The multifilamentary wire was tested first with the filaments straight, and then after the wire had been twisted with a pitch of 2 turns/cm. The losses for both the solid core and the untwisted multicore conductors were essentially identical and increased as the cube of the maximum field. The losses in the magnet made from the twisted material showed a drastic reduction at high fields with the loss varying as the first power of the maximum field.

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