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.
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机译：Wind＆React Bi-2212刀片已经在宽口径NbTi-Nb3Sn磁体中进行了制造和测试，在4.2K时提供高达20T的背景磁场。一对六层同心线圈在20T背景场中均达到350 A（JE = 200 A / mm2）的临界电流。由119m圆线制成的较厚的14层刀片在相同磁场下的临界淬火电流IQ为287A（JE = 162 A / mm2），对中心磁场的贡献为22.5T。超导磁体的磁场强度为4.2K。14层线圈配有外部保护分流器，可用于广泛的淬火测量，并承受超过150次的淬火而不会造成损坏。当线圈承载其临界淬火电流的70-95％时，在15-20T的背景场中发现最小淬火能量在200-500mJ的范围内。
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