Impact of the Number of dpa on the Superconducting Properties in HiLumi-LHC and FCC Accelerators
| Autor: | René Flükiger, Maria Ilaria Besana, T. Spina, Francesco Cerutti, Luca Bottura, Amalia Ballarino, Christian Scheuerlein |
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| Rok vydání: | 2018 |
| Předmět: |
Superconductivity
Materials science Proton 020209 energy 02 engineering and technology Condensed Matter Physics 01 natural sciences Electronic Optical and Magnetic Materials chemistry.chemical_compound Lattice constant chemistry 0103 physical sciences Atom 0202 electrical engineering electronic engineering information engineering Neutron Irradiation Electrical and Electronic Engineering Atomic physics Niobium-tin 010306 general physics Energy source |
| Zdroj: | IEEE Transactions on Applied Superconductivity. 28:1-5 |
| ISSN: | 1558-2515 1051-8223 |
| DOI: | 10.1109/tasc.2018.2810215 |
| Popis: | The aim of this paper is to estimate the change of the superconducting properties T c, J c, and B c2 in the quadrupoles of the future accelerators HiLumi-LHC and FCC, submitted to irradiation by multiple high-energy sources. The estimations are performed based on the number of displacements per atom ( dpa ), calculated by means of the FLUKA code. It is found that the dpa can be used as a single parameter for describing the radiation induced change of T c, the degree of atomic order parameter S , and the lattice parameter a in the case of multiple energy sources. The mechanism leading to the enhancement of $J_{\text{c}}$ after proton and neutron irradiation is analyzed based on a possible correlation with the concentration of Frenkel defects produced by the irradiation. Experimental data on J c/ J co versus dpa at 4.2 K allow estimating J c in the quadrupoles of HiLumi-LHC and FCC/Run1, where the values of dpa for lifetime are 2.5 × 10−4 and 5 × 10−4, respectively. The dpa in FCC/Run2 is much higher, 3 × 10 −3, thus reaching well beyond the maximum of J c versus dpa. An accurate estimation of the variation of T c, J c, and B c2 is performed based on earlier irradiation data with 14-MeV neutrons. |
| Databáze: | OpenAIRE |
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