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Thermal strain in superconducting Nb$$_{3}$$Sn strand at cryogenic temperature

Harjo, S.   ; Kawasaki, Takuro   ; Hemmi, Tsutomu; Ito, Takayoshi*; Nakamoto, Tatsushi*; Aizawa, Kazuya  

Measurements of thermal strains in the superconducting constituent (Nb$$_{3}$$Sn phase) in Nb$$_{3}$$Sn strand were performed using BL19 Takumi of MLF, J-PARC. Lattice parameters of Nb$$_{3}$$Sn phase change continuously with increasing temperature. To avoid the thermal expansion effect, lattice parameters of the filaments (extracted from the strand) measured at the same temperatures were used to estimate the thermal strains in Nb$$_{3}$$Sn phase. As results, thermal strains for axial direction below 50 K are kept roughly constant at large compressive values, while the values are much lower (the difference is $$sim$$0.13%) than that measured at room temperature.



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