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Proton irradiation effects on Nb3Sn wires and thin platelets in view of High Luminosity LHC upgrade

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Defense Thèse de doctorat : Univ. Genève, 2015 - Sc. 4805 - 2015/06/11
Abstract This thesis deals with the changes of the critical properties of Nb3Sn superconductor induced by proton irradiation in order to estimate the lifetime of Nb3Sn quadrupole magnets in the HL-LHC accelerator. Industrial Nb3Sn wires were irradiated with high energy protons at 65MeV and 24GeV, up to 1.38×1021p/m2. Within these fluences, Tc exhibited a slight, linear decrease (~3%) and a small Bc2 increased (~ 5÷10%), while Jc showed a strong increase (up to 100%) due to the formation of radiation induced defects. A universal relationship Tc vs. dpa has been established to evaluate the ∆Tc under the operation conditions of the HL-LHC. To study the higher damage induced by charge particles at the location of the Bragg peak, 10 MeV proton irradiations up to 1.0×1022p/m2 were performed on Nb3Sn HIP platelets. Diffraction measures revealed that both the microstrains and the lattice constant increase while the Bragg Williams LRO parameter decreases.
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URN: urn:nbn:ch:unige-744710
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SPINA, Tiziana. Proton irradiation effects on Nb3Sn wires and thin platelets in view of High Luminosity LHC upgrade. Université de Genève. Thèse, 2015. https://archive-ouverte.unige.ch/unige:74471

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Deposited on : 2015-08-05

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