Abstract
The critical current densityj c of a copper-coated single-core wire of Nb-50 wt.% Ti has been measured as a function of the magnetic flux density (1≤B≤8T) and the temperature (2.5 K≤T≤T c). Irradiation with 3.1-MeV protons at 25 K up to a flux of1·10 17 cm −2 led to aT c drop of 0.17 K and an almost uniform degradation of 19% over the completej c(B, T) surface. After annealing for 1 h at 285 K only 40% of thej c degradation remained. Thej c(B, T) surface can be described, independent of the irradiation dose, approximately byj c(B, T) ∼B c2(T) − B, giving a pinning force density ofF p=j cB≈4F p,max b(1−b), whereb=B/B c2 andF p,max ∼ B 2c2 . The defect structure responsible for the vortex pinning is not affected by irradiation. Thej c decrease on irradiation results from approximately 70% from a decrease ofF p,max and 30% from theT c decrease.
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This work has been supported by the technological program of the Federal Department of Research and Technology of the FRG. The author alone is responsible for the contents.
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Wohlleben, K. Influence of proton irradiation on the critical current densityj c(B, T) of NbTi. J Low Temp Phys 13, 269–286 (1973). https://doi.org/10.1007/BF00654067
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DOI: https://doi.org/10.1007/BF00654067