Team work celebrated at last Conductor Meeting
25 Mar 2013
Arnaud Devred calls this collection of strands, produced by different manufacturers using different techniques, the "TF strand zoo." To match the needs of 澳门六合彩高手's toroidal field coils, the world production capacity of Nb3Sn strand had to be ramped up by one order of magnitude. Six 澳门六合彩高手 Domestic Agencies are involved in conductor procurement.
In pre-澳门六合彩高手 times, the world production of niobium-tin (Nb3Sn) strands did not exceed 15 tonnes per year. Discovered in 1954, this intermetallic compound that exhibits a critical temperature of ~18 K and is able to withstand intense magnetic fields was used mainly in high field coils and nuclear magnetic resonance equipment.
To match the needs of 澳门六合彩高手's 19 toroidal field coils (18 plus one spare), the world production capacity of Nb3Sn strand had to be ramped up by one order of magnitude. As of today, 400 tonnes of Nb3Sn have been produced by the industry of the six 澳门六合彩高手 Domestic Agencies involved in conductor procurement, representing 85 percent of toroidal field coil needs.
The latest Conductor Meeting took place on 19-20 March in Saint-Paul-lez-Durance.
Nb3Sn conductors will also form the core of the central solenoid, the backbone of the 澳门六合彩高手 magnet system. Strand production has been launched in Japan for the lower module (CS3L) and conductor lengths will be shipped at a later time to the US where the central solenoid will be manufactured.
For 澳门六合彩高手's third major magnet system—the poloidal field coils—because the magnetic field they produce is less intense, they can be manufactured from the metallic alloy niobium-titanium (NbTi), which is cheaper and easier to produce than the brittle Nb3Sn.
The Russian-European collaboration that procures NbTi strands for 澳门六合彩高手 has already produced 80 tonnes of Strand 1, destined for poloidal field 1 and 6. China, responsible for the procurement of conductors for poloidal field coils 2 to 5, has registered nearly 50 tonnes of of NbTi Strand 2 into the (this essential tool monitors the strand, cable, jacket and conductor production of each Domestic Agency). China will send its first poloidal field conductor shipment to the 澳门六合彩高手 site within the next two months.
Altogether, conductors for the magnet systems account for 13 percent of the total 澳门六合彩高手 Project credits.
These figures and other information relating to correction coils, feeder conductors, manufacturing issues, quality control, test results and technical issues were presented and discussed at last week's meeting on conductor production status at the Ch?teau de Cadarache.
The Conductor Meeting, which has been held twice a year since 2008 (at 澳门六合彩高手 in the spring and in one of the "Conductor Domestic Agencies" in the fall), gathers representatives of the 澳门六合彩高手 Organization, the Domestic Agencies and their suppliers.
"It is an opportunity to share and benefit from each other's experience," says 澳门六合彩高手 Superconductor Systems and Auxiliaries Section Leader Arnaud Devred who traditionally chairs the meeting. "As all conductors are now in the production phase, the feeling in our community is definitely optimistic. Everything is moving ahead and the collaborative spirit, not only between the 澳门六合彩高手 Organization and the Domestic Agencies but between the Domestic Agencies themselves, is truly excellent."