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TARSIS and Pacman transverse and axial load tests on CN-WST TF Nb3Sn strand, Final Report UT-IO-2013, 7 February 2013, Contract no.: UT - OFI 309.35.310

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University of Twente
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Disciplines
  • Physics

Abstract

The reduction of the critical current in Nb/sub 3/Sn cables under transverse forces - Magnetics, IEEE Transactions on JEEE TRANSACTIONS ON MAGNETIKS, VOL. 28, N O . 1 , J w A R Y 1992 The Reduction of the Critical Current in Nb3Sn Cables under Transverse Forces. H.H.J. ten Kate, H. Weijers, S. Wessel, H. Boschman, L.J.M van de Klundert. University of Twente, Ap lied Superconductivity Centre, P.O. Box 217, 7500 Ai! Enschede, the Netherlands. Abstract---The degradation of the critical current of impregnated Rutherford type of Nb3Sn cables has been investigated as function of the transverse force * applied to the cable surface. Voltage-current charac- teristics were measured between 9 and 11 tesla by which the cable is supplied with the full transport current while a section on the broad side of the cable with a length of 40 m is under pressure. A few samples are investigated as a function of the tranmerse force strands in the cable. It appears that the degradation of the strands is not uniform, for example, at 200 HPa some strands show 10 X while others have 40 X critical current degradation also depending on the critical current criterion used. The global degradation of the cable is 12k2X at 200 MPa though it is possible that a single bad strand in a cable limits the cable to below this value due to premature quenching of that strand. I. INTRODUCTION The presence of large compressive forces in high- field magnets can drastically influence the current carrying capacity of the superconductor in the windings especially if Nb,Sn is used. In the case of 10 to 13 tesla accelerator magnets, for example, the required current density in the windings is so extreme that no additional force retaining structures like a steel casing around the conductor is allowed for. This means that the transverse compressive stresses which are in the range 150 to 200 MPa have to be absorbed by the conductor itself. As part of a development programme for a high fi

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