Develop and test an ICCS for large scale MHD magnets. Technical progress report, January 1, 1985-June 30, 1985
A three-year program to develop and test an internally-cooled cabled superconductor (ICCS) for large scale MHD magnets is directed specifically toward the development of ICCS because this type of conductor has many significant advantages over bath-cooled conductors for the MHD application: relatively higher stability margin, greater electrical integrity (because the conductor can be wrapped with continuous insulation), greater mechanical integrity and durability, and the elimination of a heavy-walled liquid helium containment vessel. The concept offers great promise in resolving the issues of constructability and long-term durability for commercial MHD magnets while minimizing the overall costs and risks of such systems. As a baseline for conductor design, it was assumed that the dimensions and construction of the conductor would be the same as those of the ICCS conductor used in the large D-shape magnet designed and built by Westinghouse for the fusion Large Coil Program (LCP), described in Reference 2. This was done to take advantage of the manufacturing technology that had been developed for that project. The MHD conductor conductor will, however, use niobium titanium (NbTi) superconductor rather than niobium tin (Nb/sub 3/Sn). Tentative conductor design requirements were established and a conductor design was developed based on the Westinghouse LCP conductor dimensions. Preliminary calculations were made of stability margin, quench temperature rise, and quench pressure. After a design review and more detailed analyses, several winding design modifications, aimed at reducing the maximum field, were analyzed. A revised winding design having an increased thickness, an increased bend radius in the end turns, and a lower current density was established as most suitable for the application.
- Research Organization:
- Massachusetts Inst. of Tech., Cambridge (USA). Plasma Fusion Center
- DOE Contract Number:
- AC22-84PC70512
- OSTI ID:
- 6127563
- Report Number(s):
- DOE/PC/70512-4; PFC/RR-86-4; ON: DE86007542
- Resource Relation:
- Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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