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This paper reports the working procedure of a 30 m cable-in-conduit-conductor (CICC), which has been first successfully fabricated by a working group of IPP in Jan. 1999. A series of problems along with measures for their solution were put forward at the request of engineering design on the basis of an in-depth understanding of the basic performance of the related techniques for the manufacture of CICC. Through a full-scale trial manufacture of a 30 m conductor including a series of test on performance technology such as tube-tube butted welding, pulling, equaring, prebending and take-up, the trial manufacture of the first home-made CICC conductor has been accomplished, demonstrating that the fabrication of a long-length CICC is entirely possible theorically and practically through our own efforts. Results and problems concerned in this trial fabrication are also presented in the paper.

Publisher Summary This chapter describes the design consideration, manufacture technology, and some test results of 20kA HTSCL. According to investigation the heat load of HTS current leads (HTSCL) at 4.5K can reduce to 0.1–0.18W/kA of the nominal leads. Using HTSCL for EAST tokamak can reduce refrigeration power of 900 W/4.5K at least and save operating cost greatly. Two 20kA current leads are made of different materials. Module 1 consists of melt cast processed Bi-2212 tube and two layers of Bi-2223/Ag-Au alloy tapes as the shunt and also to enhance current-carrying capacity. The critical current of the Bi-2212 tube alone is 9.052 kA at 77 K. The preliminary test results show that module 2 made of CryoBlock has better performance on the higher critical current and lower contact resistance. Correct solder technique and intervals between the stacks as small as possible are most important for HTSCL to reach a high performance without degradation of Bi-2223/AgAu tapes.