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(FTP1/14) Large Superconducting Conductors and Joints for Fusion Magnets: From Conceptual Design to Test at Full Size Scale

D. Ciazynski¹⁾, J. L. Duchateau¹⁾, P. Decool¹⁾, P. Libeyre¹⁾, B. Turck^1)
 
1) Association EURATOM-CEA, DRFC, CEA/CADARACHE, France

Abstract.  A new kind of superconducting conductor, using the so-called cable-in-conduit concept, is emerging mainly involving fusion activity. It is to be noted that at present time no large Nb₃Sn magnet in the world is operating using this concept. The difficulty of this technology which has now been studied for 20 years, is that it has to integrate major progresses in multiple interconnected new fields such as: large number (1000) of superconducting strands, high current conductors (50 kA), forced flow cryogenics, Nb₃Sn technology, low loss conductors in pulsed operation, high current connections, high voltage insulation (10 kV), economical and industrial feasibility. CEA was very involved during these last 10 years in this development which took place in the frame of the NET and ITER technological programs. One major milestone was reached in 1998-1999 with the successful tests by our Association of three full size conductor and connection samples in the Sultan facility (Villigen, Switzerland).

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