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Suppression of magnetization and effective filament diameter $d_{\rm eff} $ with twisting was investigated for a series of recent Bi2212 strands manufactured by Oxford Superconducting Technologies. We measured magnetization as a function of field (out to 14 T) , at 5.1 K, of twisted and nontwisted 37 $\times$ 18 double restack design strands. The samples were helical coils 5–6 mm in height and approximately...
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