Inter-strand resistance measurements in cored Nb-Ti Rutherford cables

• Published in: IEEE transactions on applied superconductivity Vol. 13; no. 2; pp. 2380 - 2383
• Main Authors: Soika, R., Anerella, M.D., Ghosh, A.K., Wanderer, P., Wilson, M.N., Hassenzahl, W.V., Kaugerts, J., Moritz, G.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: New York, NY IEEE 01-06-2003; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Applied sciences; Cables; Conducting materials; Contact resistance; Crossovers; Electric connection. Cables. Wiring; Electric potential; Electrical engineering. Electrical power engineering; Electrical resistance measurement; Exact sciences and technology; Glass transition temperature; Length measurement; Magnetic cores; Measurement techniques; Niobium; Superconducting cables; Superconducting magnets; Superconductivity; Synchrotrons; Various equipment and components; Voltage; crossover resistance; Cycling; Twisted shape; Heavy ion; System design; Contact resistance; interstrand resistance; Niobium; Superconducting magnet; Rutherford cable; Synchrotrons; Voltage; Titanium; Facility; Measurement method; AC losses; Strand; Synchrotron radiation; AC loss
• ISSN: 1051-8223; 1558-2515
• DOI: 10.1109/TASC.2003.813077

Cored Nb-Ti Rutherford cables with high crossover resistance R/sub c/ are being investigated to minimize ac losses in a set of superconducting dipole magnets for the proposed rapid cycling heavy ion synchrotron facility at the Gesellschaft fur Schwerionenforschung (GSI) in Darmstadt, Germany. This ring of magnets is based on the Relativistic Heavy Ion Collider (RHIC) design. R/sub c/ in cored cables is significantly larger than the contact resistance between adjacent strands R/sub a/. The latter, however, dominates the voltage profile when the interstrand contact resistance is measured via the usual VI technique. This makes the extraction of the magnitude of R/sub c/ out of the voltage profile very difficult. Knowledge of R/sub c/ is important to predict ac losses, because if R/sub c/ and R/sub a/ were equal, perpendicular field induced losses due to R/sub c/ would be around 50 times greater than those induced by R/sub a/. Because of the importance of the crossover resistance, we have developed a novel measurement technique for R/sub c/ in cored Nb-Ti Rutherford cables. The procedure involves removing the edges of the conductors along the region to be measured. We have measured the cables using the new technique and the usual VI technique. We describe the novel measurement technique and present results for cables made with different core materials. While measuring R/sub c/, we found evidence that R/sub a/ is nonuniform over the length of a twist pitch and is in fact significantly lower at the cable edge. We report on this as well.