Rutherford cables for HL-LHC superconducting magnets



Jerome Fleiter (CERN)


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The Rutherford cable, introduced in the 70’s at Rutherford Appleton Laboratory (RAL) in the UK, has played a key role in establishing high-energy accelerator magnet technology. The arc superconducting dipoles and quadrupoles of modern high-energy accelerators (Tevatron, HERA, RHIC and LHC) rely on Nb-Ti Rutherford cables. A Rutherford-type cable is made up of a few tens of multifilament strands, twisted together, and shaped into a two-layer cable with a high aspect ratio trapezoidal (or rectangular) cross section.  The quest for high field magnets (>10 T) led in the last three decades to the development of Rutherford cables based on superconductors with higher upper critical field such as Nb3Sn, Nb3Al or Bi₂Sr₂CaCu2O₂. The 11 T dipole and MQXF quadrupole magnets of the LHC Luminosity upgrade (HL-LHC) are made out from 40 strands Nb3Sn Rutherford cables assembled via a planetary machine. The  main  issues  regarding  Rutherford-type  cable  design  and  fabrication  are  strands compaction, residual strain in the conductor, stringent control of  cable  dimensions,  limitation  of  critical  current  and RRR degradation induced by cabling  and  control of interstrand resistance.


In this seminar the design of the different Rutherford cables of the HL-LHC machine will be presented and discussed.  The production process and status of the Rutherford cables for HL-LHC magnets will be reported. 

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Friedrich Lackner
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Macarena Gonzalez Torres
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