Transverse stress effects in ITER conductors

The International Thermonuclear Experimental Reactor (ITER) Central Solenoid and Toroidal Field Model Coils (CSMC, TFMC) and the CSMC Insert Coils using Nb/sub 33/Sn had unexpectedly low current-sharing temperatures and cable "n-values." This paper argues that the anomalous effects can be...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 2005-06, Vol.15 (2), p.1371-1374
Main Authors: Schultz, J.H., Chiesa, L., Harris, D.L., Lee, P.J., Minervini, J.V., Senkowicz, B.J., Takayasu, M., Titus, P.
Format: Article
Language:English
Subjects:
Applied sciences
Cables
Capacitive sensors
Circuit properties
Coils
Computer simulation
Conductors
Design. Technologies. Operation analysis. Testing
Digital circuits
Electric, optical and optoelectronic circuits
Electronic circuits
Electronics
Exact sciences and technology
Filaments
Inductors
Integrated circuits
Integrated circuits by function (including memories and processors)
ITER
Multipliers
Nb3Sn
Niobium
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Solenoids
Strain
strain control
Stresses
superconductor
Temperature
Tensile stress
Thermal stresses
Tin
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Summary:The International Thermonuclear Experimental Reactor (ITER) Central Solenoid and Toroidal Field Model Coils (CSMC, TFMC) and the CSMC Insert Coils using Nb/sub 33/Sn had unexpectedly low current-sharing temperatures and cable "n-values." This paper argues that the anomalous effects can be explained by the high longitudinal strain due to transverse Lorentz loads. Simulated results of earlier experiments with A15 monoliths indicate that the transverse stress "multiplier" is actually a longitudinal strain multiplier due to transverse loading. Irreversible cyclic degradation effects in the cables with the lowest thermal contraction mismatches are explained by showing that a modest precompression is required to prevent tensile cracking of a significant number of individual filaments. Examination of filament breakage due to bending shows the possibility of a well-defined threshold for irreversible damage.
ISSN:1051-8223
1558-2515
DOI:10.1109/TASC.2005.849092