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Belova, L.

Paper Title Page
TUHO01

 The High Current Bus-Bars of the LHC from Conception to Manufacture 

  • L.Belova, M.Egorychev
    Budker Institute of Nuclear Physics, Novosibirsk, Russia
  • J-L.Perinet-Marquet, C.Urpin
    CERN, Switzerland

The main magnets of the LHC are series-connected electrically in different powering circuits by means of superconducting bus-bars carrying a maximum current of 14 kA. These superconducting bus-bars consist of a superconducting cable thermally and electrically coupled to a copper profile all along the length. The function of the copper profile is essentially to provide an alternative path for the current in case the superconducting cable loses its superconducting state and returns to normal state because of a transient disturbance or of a normal zone propagation coming from the neighboring magnets. When a superconducting bus-bar quenches to normal state its temperature must always stays below a safe value of about 100 degrees C while the copper is conducting. When a resistive transition is detected, the protection system triggers the ramping down of the current from 14000 kA to 0. The ramp rate must not exceed a maximum value to avoid the transition of magnets series-connected in the circuit. This paper concerns the design and the manufacture of high current superconducting bus-bars needed to interconnect the magnetic elements of the main dipoles, the main quadrupoles of the arcs and of the dispersion suppressors of the LHC.

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