The reduction of the critical current in Nb3Sn cables under transverse loads


Oort, J.M. van and Scanlan, R.M. and Weijers, H.W. and Wessel, S. and Kate, H.H.J. ten (1993) The reduction of the critical current in Nb3Sn cables under transverse loads. IEEE Transactions on Applied Superconductivity, 3 (1, par). pp. 559-562. ISSN 1051-8223

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Abstract:The degradation of the critical current of impregnated Rutherford type Nb3Sn cables was investigated as a function of the applied transverse load and magnetic field. The cable is made of modified jelly-roll-type strand material and has a keystone angle of 1.0°. The voltage-current characteristics were determined for the magnetic field ranging from 2 to 11 T and transverse pressure up to 250 MPa on the cable surface. It was found that the 48-strand cable, made of strands with six elements in the matrix, showed a larger critical current degradation than the 26-strand cable with 36 elements per strand. The global degradation of the 48-strand cable was 63% at 150 MPa, and 40% at 150 MPa for the 26-strand cable. Microanalysis of the cross-section before and after compression is presented, showing significant permanent damage to the superconducting strands.
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Copyright:© IEEE 1993
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