Progress in the development of an 88-mm bore 10 Tn3Sn dipole magnet

A. den Ouden, W.A.J. Wessel, G.A. Kirby, T. Taylor, N. Siegel, H.H.J. ten Kate

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A 10 T, 2-layer cos(θ)-dipole model magnet with an 88 mm clear bore utilizing an advanced powder-in-tube Nb3Sn conductor is being developed for the LHC. A dedicated conductor development program has resulted in a well performing Rutherford cable containing strands that uniquely exhibit both an overall current density of 600 A/mm2 @ 11 T and filaments with a diameter of 20 μm. The resistance between crossing strands amounts to 30-70 μΩ by insertion of a stainless steel core. After being exposed to a transverse pressure of 200 MPa identical cables show negligible permanent degradation of the critical current. The mechanical support structure is further optimized in order to reduce the peak stress in the mid-plane to below 130 MPa at full excitation and to control the pre-stress build-up during system assembly. Prior to the manufacturing of the final coils a dummy 2-layer pole is wound, heat-treated at 675°C and vacuum resin impregnated. This paper presents the current status of the magnet development program and highlights in particular the successful conductor development.
Original languageEnglish
Pages (from-to)2268-2271
Number of pages4
JournalIEEE transactions on applied superconductivity
Issue number1
Publication statusPublished - 2001
Event2000 Applied Superconductivity Conference, ASC 2000 - Viriginia Beach, United States
Duration: 17 Sept 200022 Sept 2000


  • Dipole magnet
  • Superconductor
  • Nb3Sn

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