Mechanical Properties of High-Current Multifilamentary Nb3Sn Conductors

Magnet design technical report---ITER definition phase

“…For state of the art superconductors we assume that initial zero field stabilizer resistivity values of 0.2 nOm are achievable. Using this value and the calculated design maximum of 4.8 x Id" 4 we find that at the end of life the Cu resistance at a 12 T field is approximately 1 nfi-m sufficient to meet the requirements of full stability (1,2 nfl-m). An additional margin can be had by accounting for the effects of annealing of radiation damage at room temperature.…”

“…A number of room temperature irradiation studies have been performed. The results of an extensive investigation at CERN are shown in 4], For the CERN data taken from Ref. (31 the irradiation temperature was 45-62 D C. The 7-ray dose rates were between 1 x 1U 4 and 2.5 x 10 5 By hr" 1 The neutron flux (E > 1 MeV) was 1.5-1.8 x 10 10 n m 2 s 1 .…”

“…For the data from Ref. [4] the irradiation temperature was 30-40°C. The 7-ray dose rate was 1-2 xlO 6 Gvhr"'.…”

Unified Scaling Law for flux pinning in practical superconductors: II. Parameter testing, scaling constants, and the Extrapolative Scaling Expression

“…From analysis of ultrasonic attenuation, Welch evaluated the fitting constants Γ 1 , Δ v , and Δ t in equation (B.4a) and concluded, in a key finding, that the effects of the deviatoric component Δ t greatly outweigh the effects of the hydrostatic components Γ 1 and Δ v for strains greater than about ±0.1%. The effects of deviatoric strain were also modeled by Scanlan et al (1980) for different superconductor geometries.…”

Studies of the Strain-Dependent Properties of A15 Filamentary Conductors at Brookhaven National Laboratory

“…9) For the geometry of simple monofilament conduct ors , detailed calculations of the effects of triaxiality show that when 6 t is the only nonzero coefficient (i.e . only non-hydrostatic strain is important) in Eq.…”