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 ITER Director-General Kaname Ikeda signing the CS Conductor Procurement Arrangement, assisted by Ina Backbier, Senior Project Coordinator.  There will be 42 kilometres of conductor in the ITER Central Solenoid, wound tightly in 'pancakes'. 40 pancakes form a module — six stacked modules form the Central Solenoid. With the completion of this PA, JA DA will begin procurement activities with industry for the supply of 122 tons - some 42 kilometres stretched end-to-end — of CS conductor. CS conductors will be produced in unit lengths of either 605 or 905 metres; a 1 km-long facility has been constructed in Japan at Nippon Steel in Kyushu for the jacketing of these lengths of ITER CS cable and for the Japanese share of the ITER TF cable. The central solenoid is the 1,000-ton central pillar of the ITER device. 13 metres tall, it will be supported at its bottom by the 18 toroidal field magnets framing the vacuum vessel. The torus shape of the ITER Tokamak is frequently compared to a donut; the central solenoid will completely occupy the central 'donut hole'. Inside the central solenoid, CS conductors will be coiled tightly into flat layers called pancakes, each layer having 14 turns. One conductor unit length of 905 metres will be used to wind six layers of pancake (a hexapancake); a shorter unit length of 605 metres will form four layers (a quadpancake). A CS module will be composed of both hexas (6) and one quad for a total of 40 pancakes - six identical CS modules will make up the central solenoid column. As in all tokamaks, the ITER Central Solenoid will fulfil the major role of inducing the current in the plasma. In ITER, it has been designed to provide the maximum possible magnetic flux to allow 1 000 second-long plasma pulses. Like in induction cooking - where varied current in the embedded solenoid in the stove induces current directly into the cooking pot - the large flux variation across the six CS modules will induce 15 MA of current in the plasma. Each of the CS modules will be fed with different currents. Variations in this will allow the central solenoid to assist in the shaping of the plasma for better confinement, in conjunction with the poloidal field coils. << return to Newsline #112 |
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