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Critical current versus transverse stress and thermal stability of a RRP Nb3Sn Rutherford cable

Camp, W. van den (2012) Critical current versus transverse stress and thermal stability of a RRP Nb3Sn Rutherford cable.

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Abstract:A full-sized state-of-the-art superconducting Nb3Sn Rutherford cables was tested in terms of its critical current up to a magnetic peak field of 12 T and transverse stress levels up to 270 MPa. Also its thermal stability was assessed as function of magnetic field and test current over a field range of 2 to 11 T and currents from 7 to 20 kA. These measurements were preformed on a cable intended for the DS magnet, which constitutes an important first step in the LHC upgrade program. The samples were tested over a length of 45 mm on a U-shaped sample holder powered by a superconducting transformer. The cable was validated for the application in the DS magnet, both in terms of cabling degradation and in terms of operational transverse stress. Irreversible reduction of the critical current only occurs at transverse stresses far above the maximum coil stress expected in the DS magnet. The transition in thermal stability between the single strand- and the collective cable regime, which is reported in NbTi cables and sub-sized Nb3Sn cables, is not clearly seen in the magnetic field dependence of this full-sized cable and only a weak transition is found in its current dependence.
Item Type:Essay (Master)
Faculty:TNW: Science and Technology
Subject:33 physics
Programme:Applied Physics MSc (60436)
Link to this item:https://purl.utwente.nl/essays/62400
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