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The development of high field magnets utilizing Bi-2212 wind & react insert coils

By Chris M. Friend, Hangping Miao, Yibing Huang, Ziad Melhem, Fred Domptail, Maarten Meinesz, Seung Hong, Yifeng Yang, Edward A. Young and Oxford Instruments NanoScience

Abstract

Wind & react Bi-2212 inserts have been manufactured and tested inside a wide-bore NbTi-Nb3Sn magnet providing a background field up to 20T at 4.2K. A pair of six-layer concentric coils both achieved critical currents of 350 A (JE = 200 A/mm2) in a 20T background field. A thicker 14-layer insert made from 119m of round wire had a critical quench current IQ of 287A (JE = 162 A/mm2) at the same field and contributed to a combined central field of 22.5 T. This is a record for a fully superconducting magnet at 4.2 K. The 14-layer coil, equipped with an external protective shunt, was used for an extensive series of quench measurements and endured >150 quenches without damage. Minimum quench energies were found to be in the range of 200-500mJ in background fields of 15-20T when the coil carried 70-95% of its critical quench current

Topics: QC, TK
Year: 2010
OAI identifier: oai:eprints.soton.ac.uk:69578
Provided by: e-Prints Soton

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