Critical current density of Nb3Sn wires after irradiation with 65MeV and 24GeV protons

11th European Conference on Applied Superconductivity

Spina, T.^1 ; Scheuerlein, C.^1 ; Richter, D.^1 ; Bottura, L.^1 ; Ballarino, A.^1 ; Flükiger, R.^1

CERN, TE-MSC, Geneva, Switzerland^1

关键词: Fluences;    Nb3Sn wire;    Pinning forces;    Pinning mechanism;    PIT process;    Proton energy;    Radiation-induced;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/507/2/022035/pdf
DOI  :  10.1088/1742-6596/507/2/022035

来源: IOP

【 摘 要 】

Industrial Nb3Sn wires with Ti and Ta additives (RRP process) and with Ta additives (PIT process) with a diameter of 1 mm have been irradiated at room temperature with protons of 65 MeV and of 24 GeV at various fluences up to 1×1021p/m2. A steady increase of Jcvs. fluence was observed for all the wires up to the highest fluence. The observed increase of Jcat 4.2K in all wires was quite similar in spite of the very different proton energies. With increasing fluence. the radiation induced pinning force was found to increase. the enhancement Jc/Jcoafter 5.04×1020p/m2reaching 1.4 for Ta and 1.8 for Ti alloyed wires at 10T. The present results were quantitatively analysed by assuming a radiation induced point pinning mechanism in addition to grain boundary pinning. The results are compared with those of an ongoing neutron irradiation study undertaken on the same Nb3Sn wires in collaboration with the Atominstitut Vienna. Proton irradiation was found to produce considerably higher damage than neutron irradiation.