Persistent-Current Magnetization of Nb3Sn Strands: Influence of Applied Field Angle and Transport Current
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Date
2015
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Publisher
IEEE
Abstract
For many accelerator magnets field quality at the bore is a critical requirement for which reason it is necessary to fully characterize the persistent-current magnetization of strands of the kind under consideration for these magnets. The magnetization of a strand is generally measured in a magnetometer. However, certain effects can differentiate such measurements from the true magnetizations of strands in magnets. This report focuses on persistent-current magnetization: (i) measured by vibrating-sample magnetometer on segments of strand extracted from a section of heat treated Nb3Sn cable as functions of angle of the applied field and (ii) calculated as function of applied transport current. It is found that the magnetization of a strand in a cable increases by ~10% as the field applied to the cable is shifted from edge-on to face-on, and that the difference between the current-on and current-off magnetizations is not significant until close to the operational field of a magnet.
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Keywords
Nb3Sn, Magnetization, transport current, angular dependence
Citation
Published version: IEEE Transactions on Applied Superconductivity (Volume: 25, Issue: 3, June 2015) Article Sequence Number: 8200704. https://doi.org/10.1109/TASC.2014.2375818