Characterization of High Current RRP Wires as a Function of Magnetic Field, Temperature, and Strain

A new instrument for the characterization of superconducting materials as a function of Magnetic Field, Temperature and Strain, was designed, constructed and tested at Lawrence Berkeley National Laboratory (LBNL). A U-shaped bending spring was selected, since that design has proven to enable accurate characterizations of a multitude of superconducting materials for more than a decade. The new device is validated though measurements on very high current Rod Restack Processed (RRP) Internal-Tin (IT) wires, for which we will present initial results, including parameterizations of the superconducting phase boundaries and comparisons with other wire types. Accurate parametrization of modern high magnetic field conductors is important for the analysis of the performance of magnet systems.

[1]  Luca Bottura,et al.  Parameterization for the ITER Production , 2009 .

[2]  L. Bottura,et al.  $J_{C}(B,T,\varepsilon)$ Parameterization for the ITER ${\rm Nb}_{3}{\rm Sn}$ Production , 2009, IEEE Transactions on Applied Superconductivity.

[3]  A. Godeke,et al.  An improved model for the strain dependence of the superconducting properties of Nb3Sn , 2009 .

[4]  D. R. Dietderich,et al.  Nb3Sn research and development in the USA – Wires and cables , 2008 .

[5]  A. Nijhuis,et al.  Axial and transverse stress–strain characterization of the EU dipole high current density Nb3Sn strand , 2008 .

[6]  H. Kate,et al.  State of the art powder-in-tube niobium–tin superconductors , 2008 .

[7]  P. Ferracin,et al.  RRP Nb$_{3}$ Sn Strand Studies for LARP , 2007, IEEE Transactions on Applied Superconductivity.

[8]  Arend Nijhuis,et al.  Scaling law for the strain dependence of the critical current in an advanced ITER Nb3Sn strand , 2007 .

[9]  A. Godeke,et al.  A review of the properties of Nb3Sn and their variation with A15 composition, morphology and strain state , 2006, cond-mat/0606303.

[10]  A Godeke,et al.  A general scaling relation for the critical current density in Nb3Sn , 2006, cond-mat/0608404.

[11]  Albertus Godeke,et al.  Performance boundaries in Nb3Sn superconductors , 2005 .

[12]  D. Larbalestier,et al.  The upper critical field of filamentary Nb3Sn conductors , 2004, cond-mat/0410463.

[13]  H. G. Knoopers,et al.  Experimental verification of the temperature and strain dependence of the critical properties in Nb/sub 3/Sn wires , 2001 .

[14]  H. Kate,et al.  The strain dependence of the critical properties of Nb3Sn conductors , 1999 .