Fabrication of ITER Central Solenoid Model Coil inner module

Jayakurnar, R.; Gwinn, D.; Montgomery, Bruce; Minervini, J.V.; Gung, C. Y.; Randall, R.; Beck, W.; Childs, R.; Thibeault, E.; Smith, B.A.; Hycaj, T.; Wohlwend, J.W.; Paganini, D.; Gertsch, P.; Hawley, L.; Miyata, G.; Martovetsky, N.; Zbasnik, J.; Reed, R. P.

doi:10.1109/77.614669

Cited by 5 publications

(1 citation statement)

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“…The TFUS1 adopts termination used in the CS model coil inner module (CSMC-IM) [11], [12] modified to achieve uniformly low inter-strand resistivity. After removing the jacket, all cable wraps and Cr plating on all strands are removed before compaction.…”

Section: A Sample Terminationmentioning

confidence: 99%

Fabrication of the First US ITER TF Conductor Sample for Qualification in SULTAN Facility

Gung

Martovetsky²,

Hatfield³

et al. 2009

IEEE Trans. Appl. Supercond.

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A pair of 3.5 m long ITER TF size straight conductors has been fabricated into a conductor short sample and submitted to the SULTAN facility at CRPP for cold test. The sample used a triplet-based cabling pattern in one leg and a septuplet-based in the other. The legs had different cabling pattern and strand diameters, but the same void fraction. To assure the accuracy in measurement of the conductor current sharing temperature, it is important to have uniform current distribution in the cable, which requires uniformly low interstrand resistivity in the joint. In the present sample, the cable/subcable wraps and the chrome plating on all strands were removed from the cable in the termination, followed by compacting and heat treating the termination in a Glidcop sleeve. To improve current transfer, the sintered termination was further filled with soft solder before it was soldered to the copper profile. To clarify the effectiveness of short sample instrumentation, the sample was equipped with enhanced number of sensors and with sensor mounts penetrating the conductor jacket for the thermometers and voltage taps positioned in the high field zone. This paper presents the experiences in sample fabrication and instrumentation, and outlines the parameters used in the key processes.

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Section: A Sample Terminationmentioning

confidence: 99%

Fabrication of the First US ITER TF Conductor Sample for Qualification in SULTAN Facility

Gung

Martovetsky²,

Hatfield³

et al. 2009

IEEE Trans. Appl. Supercond.

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Superconducting Electromagnets

Williams¹

2005

Encyclopedia of RF and Microwave Engineering

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The design and construction of superconducting magnets has been made possible by the development of technical superconductors. There are three principal materials: the alloy niobiumtitanium (NbTi), the intermetallic compound niobiumtin (Nb 3 Sn), and the collective high‐temperature superconductors (HTSs) based on copper oxide layers in a perovskite structure. Technical superconductors are a class having special properties that allow superconductor operation in high magnetic fields and with useful current densities. Superconductors are of two types; both can support the flow of electrical current without resistance only below a combination of maximum temperature, field, and current density, with critical parameters T c , B c , and J c [1]. For type I superconductors, typical values of T c and B c are 9 K and 0.1 T, respectively. Flux is excluded from the bulk of a type I superconductor, and current flows only in a surface layer, about 10 −4 mm thick. By contrast, type II superconductors allow flux to penetrate into the bulk of the lattice in the form of an array of flux quanta.

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