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IO and China sign first Procurement Arrangement for PF Conductors
-Sabina Griffith

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The ITER Poloidal Field Coil system.

On Friday, 10 October, the ITER Organization and the Chinese Domestic Agency signed the first out of three Procurement Arrangements for the conductors of ITER's Poloidal Field (PF) conductors. According to ITER's unique in-kind procurement sharing principle, the manufacturing of the PF coils is split up between China, Russia and Europe. China will contribute 67% of the share — or in total numbers 45,4 km of conductor cable — while Russia will produce 19,7% (10,7 km) and Europe 13,3% (8,6 km).

The ITER superconducting magnet system is made up of four main sub-systems: Toroidal Field Coils, the Central Solenoid, Poloidal Field Coils and Correction Coils. The Poloidal Field Coil system consists of six independent coils. Due to their sheer size, the actual winding of PF coils 2 through 6 will take place in a special dedicated coil winding building in Cadarache. PF1 will possibly be manufactured offsite and delivered finished.

DG Ikeda and Mr. Jinpei Cheng, the Head of the new Domestic Agency, signing the first of three Procurement Arrangements.

The (Cable-In-Conduit) conductors (CICC) for the PF Coils rely on twisted, multifilament, Nickel-plated, Nbâˆ'Ti based composite strands. Two types of strands depending on their high current and high temperature behaviour, are used on three different conductor concepts for different operating requirements. Strand type 1 will be used in the conductors for PF Coil 1 and PF Coil 6, that will face currents of up to 19 MA (PF6), while type 2 is used in PF2-5.

In order to guarantee the high quality standards required for the ITER strands and conductors, all suppliers have to perform a comprehensive qualification procedure and acceptance testing.

The main components of the PF Conductor are

(1) Nickel-plated, Nb-Ti-based strands, (2) Sub-cable stainless steel wrap, (3) Sub-cable or petal (includes sub-cable wrap), (4) Stainless steel central cooling spiral, (5) Cable stainless steel wrap, (6) Stainless steel jacket.

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