Magnetic characterization of Nb3Sn strands under applied strain conditions
作者： G De Marzi , L Muzzi , A Rufoloni , U Besi Vetrella , A della Corte
DOI: 10.1088/0953-2048/22/2/025020
关键词: Isotropic etching 、 Critical field 、 Materials science 、 Strain (chemistry) 、 Swaging 、 Composite material 、 Work (thermodynamics) 、 Superconductivity 、 Magnetometer 、 Relaxation (NMR)
摘要: We performed magnetic characterizations, using a vibrating sample magnetometer, of an internal tin-type Nb3Sn technological strand. In order to compare the properties this under different strain conditions, same strand was tested compression, obtained by swaging and compacting into thin stainless steel tubes before heat treatment, as well after complete relaxation filament components, chemical etching Cu bronze matrix components. particular, we analysed Kramer extrapolated upper critical field Bc2K, zero-field temperature Tc(0) its distribution, for all samples. clarify effect due both reinforcement copper thermal pre-compression, compared our experimental results with predictions from established scaling laws based on uniaxial models. Good agreement has been found measured Tc Bc2K values, proper choice fit parameters. On other hand, observed broadening superconducting transition increasing strain. This be ascribed radial which cannot neglected in present work.
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