Electromechanical properties of superconductors for DOE/OFE applications. Final report Page: 11 of 15
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ELECTROMECHANICAL PROPERTIES OF SUPERCONDUCTORS FOR DOE/OFE
APPLICATIONS
Jack Ekin
National Insititute of Standards and Technology
Electromagnetic Technology Div.
Boulder, CO 80303
DOEOFE Accomplishment Highlights for FY'94
* A major report combining several years of electromechanical property data was completed
and copies were sent to all participants in the DOEIOFE program. The report contains data
on conductors that fall in three general categories: Candidate conductors, experimental
conductors, and reference conductors. Candidate Nb3Sn superconductors studied include the
USDPC cable strand and an ITER candidate conductor. Experimental superconductors
included axial strain measurements on a V3Ga tape conductor that showed good performance
at magnetic fields up to 20 T and three experimental Nb3Sn conductors containing dispersion
hardened copper reinforcement for increased tensile strength. Finally, the reference
conductors tested were three different Nb3Sn conductors from the first and second VAMAS
international Nb3Sn critical-current round robins. Published papers containing key results
were also incorporated into the report, including the first measurement of the transverse
stress effect in Nb3Sn, the effect of stress concentration at cable-strand crossovers, and
measurements of the electromechanical properties of Nb3Al.
* Electromechanical property data were also obtained on a Teledyne Wah Chang Nb3Sn
candidate superconductor for ITER. The results showed some variability in the critical
mechanical parameters (prestrain and irreversible strain) which helps to explain some of the
critical current variability observed in the critical current tests of this conductor. The data
also served to cross calibrate Teledyne Wah Chang's measurement apparatus and they used
the data as part of their technical exhibit at the recent Applied Superconductivity Conference.
* Measurements were also completed of the transverse stress effect and axial stress effect of
a monofilament conductor. These data will serve as the basis for finite element modeling of
the three-dimensional stress state in Nb3Sn. A finite element code has been written and we
are starting to analyze the results in an attempt to ultimately generate a three-dimensional
strain scaling law for use in superconductor magnet engineering.1
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Ekin, J. W. & Bray, S. L. Electromechanical properties of superconductors for DOE/OFE applications. Final report, report, September 1, 1998; United States. (https://digital.library.unt.edu/ark:/67531/metadc707370/m1/11/: accessed April 23, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.