ITER and JT-60SA Conductor Production at ICAS

Corte, A. della; Zenobio, A. Di; Muzzi, L.; Turtù, S.; Affinito, L.; Anemona, A.; Vetrella, U. Besi; Chiarelli, S.; Freda, R.; Reccia, L.; Roveta, G.; Roveta, M.; Quagliata, F.; Bragagni, A.; Seri, M.; Gabiccini, F.; Valori, D.

doi:10.1109/tasc.2012.2234178

Cited by 14 publications

(14 citation statements)

References 5 publications

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“…The one in the US (located at HPM in Tallahassee, Florida) is the most particular as it runs parallel to the Tallahassee airport runway. Save for the facility in Europe, which is used for both ITER and JT60 super upgrade conductor productions [39], all the other lines have been set up and are operated for ITER.…”

Section: Iter Conductorsmentioning

confidence: 99%

Challenges and status of ITER conductor production

Devred

Backbier

Bessette

et al. 2014

Supercond. Sci. Technol.

170

118

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Taking the relay of the Large Hadron Collider (LHC) at CERN, ITER has become the largest project in applied superconductivity. In addition to its technical complexity, ITER is also a management challenge as it relies on an unprecedented collaboration of 7 partners, representing more than half of the world population, who provide 90% of the components as in-kind contributions. The ITER magnet system has a stored energy of 51 GJ and involves 6 of the ITER partners. The coils are wound from Cable-In-Conduit Conductors (CICCs) made up of superconducting and copper strands assembled into a fully transposed, rope-type cable, inserted into a conduit of butt-welded austenitic steel tubes. The conductors for the Toroidal Field (TF) and Central Solenoid (CS) coils require about 500 tons of Nb 3 Sn strands while the Poloidal Field (PF) and Correction Coil (CC) and busbar conductors need around 250 tons of Nb-Ti strands. The required amount of Nb 3 Sn strands far exceeds pre-existing industrial capacity and has called for a significant worldwide production scale up. The TF conductors are the first ITER components to be mass produced and are more than 50% complete. During its life time, the CS coil will have to sustain several tens of thousands of electromagnetic (EM) cycles to high current and field conditions, way beyond anything a large Nb 3 Sn coil has ever experienced. Following a comprehensive R&D program, a technical solution has been found for the CS conductor, which ensures stable performance versus EM and thermal cycling. Productions of PF, CC and busbar conductors are also underway. After an introduction to the ITER project and magnet system, we describe the ITER conductor procurements and the Quality Assurance/Quality Control programs that have been implemented to ensure production uniformity across numerous suppliers. Then, we provide examples of technical challenges that have been encountered and we present a status of ITER conductor production worldwide.

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Section: Iter Conductorsmentioning

confidence: 99%

Challenges and status of ITER conductor production

Devred

Backbier

Bessette

et al. 2014

Supercond. Sci. Technol.

170

118

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“…An intense crash program has thus been launched by ITER IO in 2012, to optimize the conductor design, possibly maintaining unvaried conductor size and geometry. Following, once again, the indications given by mechanical computations [104,109], four different CS CICC samples have been manufactured during summer 2011 [110,111], with variations of cable parameters with respect to the reference design, in terms of twist pitch values, as outlined in table 1. A very STP sequence, proposed by ITER and never probed before and a long one (LTP) were considered, and the appearance of the different produced cables can be observed in figure 8.…”

Section: The Iter Cs Development Strategymentioning

confidence: 99%

Cable-in-conduit conductors: lessons from the recent past for future developments with low and high temperature superconductors

Muzzi

Marzi

Zenobio

et al. 2015

Supercond. Sci. Technol.

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We review progress in the design of high field superconducting cable-in-conduit conductors (CICCs) for fusion applications, with special attention to the results of recent key experiments, leading to the state-of-the-art CICC technology: the ITER Toroidal Field and Central Solenoid programs, the EFDA Dipole conductor development program, the NHFML Hybrid Magnet project, the EU-TF Alt conductor demonstration, and the CRPP React & Wind flat cable test. For these projects, the main CICC design driver was the mitigation of Nb 3 Sn conductor performance degradation with electro-magnetic loading cycles. This was achieved by proper choice of cable layout and of conductor geometry, depending on the specific operating conditions and project requirements. In all cases, the necessity to limit cable movements inside the conductor jacket was identified to be of crucial importance. The main aspects of CICC manufacture are also discussed here, at least for what is the experience gained by the authors in both CICC jacketing and cabling processes. Finally, the state of the art of high-temperature superconducting (HTS) cables is discussed: at present, this technology is still in its infancy, but it is highly likely that major technological improvements could eventually lead to a widespread use of HTS CICCs.

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“…The aim was to confirm the properties of cold rolled co-extruded Al-0.1wt%Ni on a production-scale, to determine the optimal area reduction, and to assess the workability by bi-directional rolling as function of the amount of passes. Work hardening was applied on a 50 ton DEM, actively driven, four-roll Turks-head mill at Criotec, Chivasso (I); an installation also used for the ITER cable-in-conduit conductor production [9,10]. Force was applied mainly in the short transverse direction (ST), while the wide transverse direction (TD) was constrained to preserve cable integrity and maintain a realistic aspect ratio (width/thickness).…”

Section: Materials and Experimental Methodsmentioning

confidence: 99%

Effect of thermo-mechanical processing on the material properties at low temperature of a large size Al-Ni stabilized Nb-Ti/Cu superconducting cable

Langeslag

Curé

Sgobba

et al. 2014

AIP Conference Proceedings

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Abstract. For future high-resolution particle experiments, a prototype for a 60 kA at 5 T, 4.2 K class conductor is realized by co-extrusion of a large, 40-strand Nb-Ti/Cu superconducting cable with a precipitation type Al-0.1wt.%Ni stabilizer. Microalloying with nickel contributes to the strength of the stabilizer, and avoids significant degradation in residual resistivity ratio, owing to its low solid solubility in aluminum.Sections of the conductor are work hardened to increase the mechanical properties of the as-extruded temper. Mechanical and resistivity characteristics are assessed as function of the amount of work hardening, at room temperature as well as at 4.2 K.Thermal treatments, like resin curing after coil winding, can cause partial annealing of the cold-worked material and reverse the strengthening effect. However, targeted thermal treatments, applied at relatively low temperature can result in precipitation hardening. The depletion of nickel in the aluminum-rich matrix around the precipitates results in an increased strength and a decreased effect of nickel on the thermal and electrical resistivity of the material.The present work aims at identifying an optimal work hardening sequence, and an optimal thermal treatment, possibly coinciding with a suitable coil resin curing cycle, for the Al-Ni stabilized superconductor.

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ITER and JT-60SA Conductor Production at ICAS

Cited by 14 publications

References 5 publications

Challenges and status of ITER conductor production

Challenges and status of ITER conductor production

Cable-in-conduit conductors: lessons from the recent past for future developments with low and high temperature superconductors

Effect of thermo-mechanical processing on the material properties at low temperature of a large size Al-Ni stabilized Nb-Ti/Cu superconducting cable

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