Fig. 2-17 Niobium tin superconducting strand developed for ITER

Central Solenoid Model Coil (outer module) inner diameter 1.6 m outer diameter 4 m height 4 m maxumum nagnetic field 13 T rated current 46 kA time variation of magnetic field 2 T/s stored magnetic energy 660 MJ

Fig. 2-18 Testing facility for the ITER Central Solenoid Model Coil and major specifications of the coil

Large superconducting coils producing strong magnetic fields are indispensable components of a fusion reactor to confine and control the reacting plasma stably. JAERI started R&D on the basic technology of superconducting coils early on and has since had many major achievements. At present, under the ITER EDA program, we are developing the superconducting coil technology and the cryogenic system technology for ITER; the fabrication of part of the Central Solenoid (CS) Model Coil and the construction of its test facility in which the ITER CS Model Coil is to be tested jointly by the ITER participants, are in progress. Close technical cooperation exists between the Joint Central Team sited at the Naka Joint Work Site of the ITER EDA, and JAERI. Naka has now established its position as one of the international development centers of superconducting coil technology. The CS Model Coil under construction at JAERI is a half-sized model of ITER, but is manufactured with the same conductor and the same winding configuration to be used for the full-size CS coil of ITER. It will be tested at the magnetic field strength of 13 T, the maximum design value of ITER. The testing facility will be completed in autumn 1995 as the world's largest facility of its kind. Newly developed Nb3Sn strands for ITER are shown in Fig. 2-17, and major specifications of the CS Model Coil and a schematic of the test facility are shown in Fig. 2-18.

Reference H. Nakajima, Development of ITER Model Coil by Japanese Home Team, Proceedings of the 52th Meeting on Cryogenics and Superconductivity (Okayama, Nov. 1994), p.141-142.

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