Stress limitations on superconducting magnet performance
Ultimate limits on the size and performance of superconducting magnets can be imposed by electromagnetic forces generated within the conductor. In the case of NbTi conductor, the superconducting properties begin to deteriorate as the working induction approaches B/sub c2/ before the stress levels become a significant fraction of the flow stress. This may not be the case for conductors based on the brittle A-15 compounds, where stress levels which cause degradation of superconducting properties could be achieved at inductions below B/sub c2/ for these materials. There are two stress effects which influence the superconducting properties of A-15 compounds. The compounds are intrinsically brittle, and fracture, with little or no observable plastic deformation, at tensile strain approximately 2 x 10/sup -3/. If this strain is exceeded, even though the composite conductor may exhibit no mechanical failure, the current path is interrupted, and J is drastically reduced. The second effect is that, when subjected to compressive stresses, the critical temperatures of most A-15 compounds are reduced. The limits placed upon magnet performance by these constraints of stress are explored. The predictions are not meant to be highly accurate, as performance will depend upon the details of magnet design, but indicative of what might be achieved with A-15 conductors. (TFD)
- Research Organization:
- Brookhaven National Lab., Upton, NY (USA)
- DOE Contract Number:
- EY-76-C-02-0016
- OSTI ID:
- 7316731
- Report Number(s):
- BNL-22941; CONF-770801-10; TRN: 77-016335
- Resource Relation:
- Conference: Cryogenic engineering conference, Boulder, CO, USA, 2 Aug 1977
- Country of Publication:
- United States
- Language:
- English
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